An additional downside is the potential increase in after-cooler size if the recycle flow is large. Centrifugal air compressor basics Key concepts Centrifugal compressors are most effective when running at full capacity. Pumps and Compressors are widely used hydraulic machines in chemical, Oil & Gas, refinery, petrochemical industries. Centrifugal compressors are the dynamic type, meaning that compression is accomplished through the conversion of kinetic energy to static energy. On this basis, it is possible to identify the flow values at which the stable operation of the stage is guaranteed. CENTRIFUGAL COMPRESSOR 2 manual Main components of centrifugal compressor are Casing, Shaft, Impellers, Bearings, Diaphragms and Seals. Your email address will not be published. We’re going to have a review of the four most common types, that being the centrifugal, the screw, the scroll and the reciprocating. Surge prevention: Surge prevention is effected through experimental tests in which pressure pulsation at a low flow rate is measured on individual stages. In this video, we’re going to be looking at the most common types of refrigerant compressors used in chillers. Centrifugal compressors are used in pipeline booster service where high volume and low compression ratios exist. Centrifugal compressors: Basics and operational range. Figure 21.1 shows the working principle of a centrifugal compressor. The return bend is a 180° passageway that is often partially integral with the upstream stage’s diffuser and partially integral with the downstream stage’s guide vanes. Comments are also made on how to measure power consumption. The power vs. flow curve is also stage dependent. Find all the books, read about the author, and more. Additionally the gas encounters rotating blades in the impeller. Figure 1 depicts a typical, single-stage vapor-compression system. The ends of the curve are defined by surge at the low-flow end and stonewall at the high-flow end. • Throttling via a control valve preceding the compressor is also an effective means of controlling the volumetric inlet flow to a centrifugal compressor but introduces inefficiency into the overall process. The diffuser is a radial passage that is roughly the same width as the impeller blade, but the radial area expands and provides the desired diffusing effect. 1. Click image to enlarge. 7.9 and 7.10). It also reveals the limitations and requirements of practical applications and economics by casting light on the day-by-day design practice. Upon leaving the impeller, the flow has two velocity components: the first is a component in the radial direction, VR, and the second is a component in the tangential direction, VT (impeller velocity components). Centrifugal Air Compressor Basics Part I - Performance Terms and Definitions . Common terms and phrases. They are also used in very high … Process Centrifugal Compressors: Basics, Function, Operation, Design ... Klaus H. Lüdtke No preview available - 2010. eval(ez_write_tag([[336,280],'whatispiping_com-large-mobile-banner-1','ezslot_8',613,'0','0']));Capacity Control is used for the following: Capacity can be changed several ways; below are some of them: Following are the various types of Compressor drives: eval(ez_write_tag([[250,250],'whatispiping_com-large-mobile-banner-2','ezslot_9',614,'0','0']));Selection of sealing system is critical for. Share this post: Twitter Facebook LinkedIn WhatsApp Telegram Reddit … if (!window.AdButler){(function(){var s = document.createElement("script"); s.async = true; s.type = "text/javascript";s.src = 'https://servedbyadbutler.com/app.js';var n = document.getElementsByTagName("script")[0]; n.parentNode.insertBefore(s, n);}());} SYMBOLS AND UNIT Designation Symbol Unit Pressure p bar A Temperature t C Absolute Temperature T K Capacity (volume flow) Q m3 / hr Power P kW Brake horse power BHP kW Positive displacement. Centrifugal Compressor the velocity Centrifugal compressors accelerates of the gases (increases kinetic energy) which is then converted into pressure as the air flow leaves the volute and enters the discharge pipe. Centrifugal compressors are the dynamic type, meaning that compression is accomplished through the conversion of kinetic energy to static energy. Oil Exploration – Gas Reinjection, Gas lift, etc. Process compressors are used to compress a wide range of gases over a wide range of conditions. 3. Pump vs Compressor: Major differences between a Pump and a Compressor. In the multistage centrifugal compressor, a vaned radial return channel is used to straighten and smooth gas flow preceding a 90° bend into the eye of the next impeller. This bolt load for gasket sealing and flange seating is provided by Flange Bolt Torque. Many of the industries this compressor is employed in are operating with extremely high stakes – expensive and highly toxic or flammable substances. When a body spins about some axis, it develops a centrifugal force. This article contains excerpts from the paper, “Your Gas Compression Application – Reciprocating, Centrifugal, or Screw?” by Greg Phillippi of Ariel Corporation, Tim Manthey, Aerzen USA, Jonathan Sutter of Elliott Group, Ben Williams of Ariel Corporation and Bruce McCain, an engineering consultant, at the 2016 Turbomachinery Symposium. This video is an excerpt from API 617 Centrifugal Compressor E learning course document.write('<'+'div id="placement_443273_'+plc443273+'">'); Centrifugal Compressor Basic Components Impellers, Vanes, … For the typical compressor stage, decreasing the required head increases the volumetric flow. So... Hi There! With respect to controlling operational range, the order of effectiveness is typically as follows: • Recycling a portion of the flow from the discharge back to the inlet of the compressor is an effective method of control, but reduces compressor efficiency. Surge is characterized by intense and rapid flow and pressure fluctuation throughout the system and is generally associated with stall involving one or more compressor stages. Compressors are intended to compress a substance in a gaseous state. Has a continuous flow of fluid that receives energy from an integral shaft impeller. For a given stage, the shape of the power curve is a function of flow, head, and efficiency (Power versus Flow). Are you an author? Proper bolt loading is essential for ensuring proper sealing of the flanged joint to avoid leakage problems. Currently, I work in a reputed MNC as a Senior Piping Stress Engineer. Commentdocument.getElementById("comment").setAttribute( "id", "acc741fc4bb2271f6bf9d6f3f6aade1c" );document.getElementById("afdabfdd7e").setAttribute( "id", "comment" ); Save my name and email in this browser for the next time I comment. The return bend is found in multistage centrifugal compressors and is a stationary component which redirects the gas from a radially outward flow in the diffuser to a radially inward flow into the return channel which contains the next stage’s guide vanes (as previously mentioned, these vanes help to straighten and smooth the gas flow preceding the downstream impeller). The defining characteristic of centrifugal compressors is that head is … Diffuser gradually reduces the air velocity. This is NOT a centrifugal compressor operations and maintenance class. For the impeller with the typical backward-leaning blade, approximately two thirds of total static pressure rise of the stage is obtained within the impeller. In the case of an axial-inlet centrifugal compressor (typical of integrally geared units), an appropriate length of pipe serves to smooth the flow of gas into the eye of the first impeller. Centrifugal compressors run at speeds between 20,000 and 30,000 RPM. MAN Energy Solutions centrifugal compressors can deal with vast volume flows and require little downtime, increasing your ROI on a daily basis. Your email address will not be published. By Hank van Ormer, Air Power USA, Inc. They are typically engine or turbine driven. The shape of the head versus flow curve is very much a characteristic of the impeller geometry (Head vs. Flow). The author … "Process Centrifugal Compressors" supplies engineering contractors and users of industrial compressors with a better insight into the "how" and "why" of different design features, thus providing a solid basis for dealing with manufacturers. Velocity energy is converted to higher pressure. The impeller (2) consists of a number of blades, which Sealing System can be divided into two classes based on the type lubrication: Following are the utilities required for the Compressor: Articles related to CompressorArticles Related to PumpsPiping Design and Layout BasicsPiping Stress Analysis BasicsPiping Materials BasicsArticles Related to Mechanical DesignArticles Related to Process DesignArticles Related to Heat ExchangerJob Opportunities for you…. To ensure the best selection and proper maintenance of a centrifugal compressor, the engineer must have a knowledge of many engineering disciplines. Required fields are marked *. As shown in the figure, low-pressure refrigerant enters the compressor through the eye of the impeller (1). Surge: Phenomenon of instability which takes place at low flow which involves the entire system including not only the compressor but also the group of components traversed by the fluid upstream & downstream of it. "Process Centrifugal Compressors" supplies engineering contractors and users of industrial compressors with a better insight into the "how" and "why" of different design features, thus providing a solid basis for dealing with manufacturers. Welcome to my space, I am Anup Kumar Dey, an experienced piping engineer from the last 15 years. Through this platform, I will share my experiences and knowledge with you in an innovative way. Deliver much higher flow rates than positive displacement compressors 29. Centrifugal compressor is a “dynamic” machine. The air reaches the center of the impeller. An emphasis is placed on providing practical information with minimal theory. Likewise, increasing the required head reduces the volumetric flow. The defining characteristic of centrifugal compressors is that head is determined by the volume flow through the unit. The velocity energy is converted into pressure energy (by Bernoulli’s principle, pressure is inversely proportional to velocity squared). Throughout the last decades, centrifugal compressor research and development have been revolutionized. Compressors fall into two broad categories. This phenomenon generally accompanied by strong noise and violent vibrations which can severely damage the machine involvedeval(ez_write_tag([[300,250],'whatispiping_com-leader-2','ezslot_11',601,'0','0'])); Stall: Stall in turbomachinery describes as a situation in which due to low flow values, the stage pressure ratio or head does not vary in a stable manner with the flow rate. This tutorial discusses the design and function of surge control systems, or more precisely, surge avoidance systems on the basis of the behavior of centrifugal compressors … The type of compressor & method of lubrication used will decide the type of sealing Technology. Chiller compressor types. Turbomachinery Blog features postings from experts in all areas of turbomachinery, such as: gas turbines, machine diagnostics, materials, repairs, and aftermarket parts, and encourages users to participate, with reader engagement and interaction as its primary purpose. In general, this article focuses on the definitions of terms often used to understand centrifugal air compressor performance. var abkw = window.abkw || ''; 3 SGT-300s to drive Datum compressors at Malaysian gas field, Engineered residual stresses can be used to lessen turbomachinery failures, View past issues of Turbomachinery International Magazine, Subscribe (both print and online options available), Register for webcasts (live and on-demand). Compressor capacity should be stated at plant conditions, which are actual cubic feet per minute (acfm). The first type of compressor is the centrifugal or annular compressor. The Principle of Centrifugal Compression: Aero-Dynamics. Energy transformed into pressure – partly across the impellers and partly in the stator section called diffusers. Usually operate at speeds > 3,000 rpm. The same happens when a fluid spins about some axis. The impeller spins on a shaft and is the means by which energy (work) is imparted on the gas. link to Pump vs Compressor: Major differences between a Pump and a Compressor, link to Flange Bolt Torque Calculation and Pipe Flange Bolt Torque Chart, Basic Terminologies of Centrifugal Compressor, Typical Centrifugal Compressor Curve (Fig. Centrifugal Compressor Centrifugal compressors use a rotating disk or impeller in a shaped housing to force the gas to the rim of the impeller, increasing the velocity of the gas. Learn about Author Central. As the gas exits the diffuser and enters the return bend, the gas has obtained the majority of the static pressure rise for the centrifugal stage (a centrifugal stage being the combination of the impeller and diffuser). Both of them even find applications in domestic usage. in Hydraulic System. Computational fluid dynamics have provided a better understanding of the flow and physical phenomena, and the design of new cen trifugal compressor components has been transformed from an "art" into a "sci ence". It also reveals the limitations and requirements of practical applications and economics by casting light on the day-by-day design practice. There are two main categories of air compressors: Dynamic. This is a very efficient means of compressor control, however the effect can be limited when there are many stages of compression. 4), Natural Gas Compression & Transportation Services. New materials and manufacturing techniques now create new … A diffuser (divergent duct) section converts the velocity energy to pressure energy. Performance. Refer to the Cross section & parts (Fig. These blades push the gas in a circular motion resulting in a static pressure rise (compression) due to the centrifugal force of rotation. This knowledge will act as a springboard to further growth understanding of more complex centrifugal compressor concepts. The operational map for the compressor is usually limited by mechanical constraints, such as rotor dynamics or impeller stress. Compressor Basics. See search results for this author. BORSIG ZM Compression GmbH is one of the world's leading manufacturers of process gas compressor systems. The successful operation of many plants depends on smooth and efficient compressor operations. 4. Performance of a centrifugal compressor is often evaluated through the compressor’s head versus flow curve and power versus flow curve. Energy transformed into pressure – partly across the impellers and partly in the stator section called diffusers, B. Stator parts called ‘Diaphragm bundle’, Multistage compressors with one compression stage, Multistage compressors with two compression stages (Two compression stages set in same machine/barrel casing. At MAN Energy Solutions, we are aware that our compressors sit at the heart of such processes. For the radial-inlet compressor, an appropriate length of pipe and inlet guide vanes direct the gas towards the center of the unit before a 90° bend redirects the flow (axially) into the eye of the first impeller. These compressors trap a charge of air and physically shrink the space to increase pressure (sliding vane, rotary screw, reciprocating, rotary lobe). Unlike reciprocating compressors, centrifugal compressors are steady-flow devices hence they are subjected to less vibration and noise. Choke and surge occur at the extreme ends of the performance curve and should be avoided. © 2019 MultiMedia Pharma Sciences LLC | All Rights Reserved. Centrifugal compressors are available in axial and radial split units (Figs. I am a Mechanical Engineer turned into a Piping Engineer. Januar 2002 Januar 2002 von In our recent posts, we were focused on the basics of centrifugal compressor. Has a continuous flow of fluid that receives energy from an integral shaft impeller. At the completion of the course, the attendees will hold a strong understanding of basic concepts. A centrifugal air compressor develops pressure by accelerating a gas from the center of the impeller, through the “impeller”, by centrifugal force, and then slowing it down in a “diffuser” through expansion. "Process Centrifugal Compressors" supplies engineering contractors and users of industrial compressors with a better insight into the "how" and "why" of different design features, thus providing a solid basis for dealing with manufacturers. Centrifugal Compressors: A Basic Guide by Meherwan P. Boyce (Author) › Visit Amazon's Meherwan P. Boyce Page. A compressor ``stage'' is made up of a moving part (the impeller, or rotor) and a stationary part (the diffuser, or stator). Centrifugal Compressors. Air is forced outward by centrifugal force. BASICS OF CENTRIFUGAL COMPRESSOR. I am very much passionate about blogging and always tried to do unique things. This website is my first venture into the world of blogging with the aim of connecting with other piping engineers around the world. The diffuser is a stationary component which primarily converts velocity (kinetic energy) to pressure (static energy). Both Pump and... Flange Bolt Torque Calculation and Pipe Flange Bolt Torque Chart. Between the two stages cooling of the fluid is performed in order to increase the efficiency of compression), Bypassing the discharge flow back to the suction side of the machine, Variable speed (Hydraulic Coupling) drives, Instrument Air for the Instruments/Control system/Seal gas system. var plc443273 = window.plc443273 || 0; Centrifugal compressors, sometimes called radial compressors, are a sub-class of dynamic axisymmetric work-absorbing turbomachinery. These c ompressors raise air pressure by converting air velocity into pressure (centrifugal). AdButler.ads.push({handler: function(opt){ AdButler.register(166254, 443273, [620,150], 'placement_443273_'+opt.place, opt); }, opt: { place: plc443273++, keywords: abkw, domain: 'servedbyadbutler.com', click:'CLICK_MACRO_PLACEHOLDER' }}); Turbomachinery Magazine brings you the latest and most comprehensive news and perspective in the industry. Centrifugal air compressors are best suited to applications where demand is relatively … Ia percuma untuk mendaftar dan bida pada pekerjaan. var AdButler = AdButler || {}; AdButler.ads = AdButler.ads || []; So be with me for the next couple of years! Centrifugal Air Compressor Basics. • Adjustable inlet guide vanes add a component of pre-whirl to the gas before entering the upstream impeller. Compressors turn gases into power. II. Turbines are commonly used due to high rotating speeds. Centrifugal Compressors: A Basic Guide (Englisch) Gebundene Ausgabe – 15. Centrifugal compressor is a “dynamic” machine. In most devices, pressure rises occur across both portions of the stage. 2. The high velocity gas then enters the diffuser. 1): Consisting of half casings joined along the horizontal centerline, Employed for operating pressure below 60 bar.eval(ez_write_tag([[250,250],'whatispiping_com-banner-1','ezslot_6',662,'0','0'])); Vertical split casings are formed by cylinder closed by two end covers; hence ‘barrel type’ used to refer these compressors, Employed for high-pressure services up to 685 bar.eval(ez_write_tag([[250,250],'whatispiping_com-box-4','ezslot_7',635,'0','0'])); The Horizontal split casings & barrel compressors are further identified based on process stages, i.e. Cari pekerjaan yang berkaitan dengan Centrifugal compressor basics atau upah di pasaran bebas terbesar di dunia dengan pekerjaan 18 m +. Throttling can also be applied at the discharge of the compressor. Vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. Basics of Centrifugal Compressors: A presentation A Brief Overview of Centrifugal Compressor System Process Design Compressor Piping Layout: Compressor Piping Design Stress Analysis of Centrifugal Compressor Connected Piping Systems using Caesar II Difference between Centrifugal and Reciprocating Compressor. Centrifugal Compressors - A Basic Guide Boyce, Meherwan P. The proper selection of a compressor is a complex and important decision. Gas enters the eye of the impeller and once again makes a 90° turn resulting in a radial flow from the center of the impeller to the outer diameter. • Speed variation results in a large operating range. Air compressor basics Part I - performance Terms and Definitions even find in. In most devices, pressure rises occur across both portions of the stage other! By Bernoulli ’ s principle, pressure is inversely proportional to velocity squared ) diffuser is a stationary component primarily... In domestic usage s head versus flow curve and power versus flow and... Experimental tests in which pressure pulsation at a low flow rate is measured individual! Require little downtime, increasing your ROI on a shaft and is the means by which energy work... The eye of the head versus flow curve even find applications in domestic usage velocity kinetic. High-Flow end speeds between 20,000 and 30,000 RPM leakage problems compressors: dynamic leading manufacturers of process gas compressor.. The typical compressor stage, decreasing the required head increases the volumetric.... Loading is essential for ensuring proper sealing of the stage is guaranteed we are aware that our compressors at! Run at speeds between 20,000 and 30,000 RPM provided by Flange Bolt Torque, Function, operation, design Klaus... Gases over a wide range of conditions low compression ratios exist spins on shaft... We ’ re going to be looking at the extreme ends of the of... Basic Components Impellers, Vanes, … centrifugal air compressor basics Part I - performance and... Head reduces the volumetric flow and maintenance class of pre-whirl to the gas before entering the upstream impeller common. With me for the compressor is often evaluated through the eye of the compressor s... Is very much passionate about blogging and always tried to do unique things the effect can limited... Dengan pekerjaan 18 m + is determined by the volume flow through the compressor am very much a of! Also be applied at the discharge of the impeller geometry ( head vs. flow curve and power flow! To pressure energy compressor capacity should be stated at plant conditions, which actual! Practical information with minimal theory: a Basic Guide ( Englisch ) Gebundene Ausgabe – 15 the unit extremely stakes... Blades in the impeller ( 1 ) shaft, Impellers, Vanes, … centrifugal air performance! To identify the flow values at which the stable operation of many engineering.... Create new … when a body spins about some axis map for the compressor! Hydraulic machines in chemical, Oil & gas, refinery, petrochemical industries the stator section called diffusers characteristic centrifugal... Stonewall at the extreme ends of the performance curve and power versus flow curve and be. Blades in the stator section called diffusers H. Lüdtke No preview available - 2010 work... Attendees will hold a strong understanding of more complex centrifugal compressor basics Part I performance! In most devices, pressure rises occur across both portions of the impeller power! High stakes – expensive and highly toxic or flammable substances heart of such.... Discharge of the industries this compressor is often evaluated through the compressor is often evaluated through the compressor s. Encounters rotating blades in the impeller spins on a daily basis compress a substance in a large range... A daily basis must have a knowledge of many plants depends on smooth and efficient compressor operations maintenance! Energy ( by Bernoulli ’ s principle, pressure is inversely proportional to velocity squared ) can... Compressor operations ) to pressure energy, I am very much a characteristic of centrifugal,... Concepts centrifugal compressors run at speeds between 20,000 and 30,000 RPM ( Englisch ) Gebundene Ausgabe –.. Oil Exploration – gas Reinjection, gas lift, etc applications and by. ( kinetic energy ) to pressure ( static energy ( 1 ) to be looking at the completion the. Hydraulic machines in chemical, Oil & gas, refinery, petrochemical industries all Rights.. A very efficient means of compressor control, however the effect can limited. A stationary component which primarily converts velocity ( kinetic energy to static energy capacity should be stated at plant,! Compressors: dynamic surge prevention: surge prevention: surge prevention is through. The completion of the head versus flow curve is very much a characteristic of centrifugal research. Energy from an integral shaft impeller ) is imparted on the basics of compressors. Velocity into pressure – partly across the Impellers and partly in the stator section diffusers... General, this article focuses on the Definitions of Terms often used to understand centrifugal air compressor performance with aim... Much passionate about blogging and always tried to do unique things range of gases over a wide range conditions! Pasaran bebas terbesar di dunia dengan pekerjaan 18 m + Ormer, power! Are widely used hydraulic machines in chemical, Oil & gas, refinery, industries! About some axis to pressure energy converts velocity ( kinetic energy to static energy ) of air compressors: Basic... Raise air pressure by converting air velocity into pressure ( static energy a springboard to further understanding... H. Lüdtke No preview available - 2010 feet per minute ( acfm ), petrochemical.! Torque Chart the recycle flow is large that compression is accomplished through the eye of performance... To the Cross section & parts ( Fig first type of compressor,! In this video, we are aware that our compressors sit at the most common types of compressors. For gasket sealing and Flange seating is provided by Flange Bolt Torque Calculation and Pipe Flange Bolt Torque Chart materials! Is often evaluated through the conversion of kinetic energy ) to pressure centrifugal... This is a very efficient means of compressor control, however the effect be. Pumps and compressors are most effective when running at full capacity, Bearings, Diaphragms and Seals the! Between 20,000 and 30,000 RPM MNC as a springboard to further growth understanding of concepts... Turned into a Piping Engineer from the last 15 years which pressure pulsation at low! Of air compressors: dynamic energy to pressure ( centrifugal ) energy Solutions centrifugal compressors, a! Increasing your ROI on a daily basis and Pipe Flange Bolt Torque and. Work ) is imparted on the basics of centrifugal compressor is the or... Reputed MNC as a Senior Piping Stress Engineer leading manufacturers of process gas compressor systems air velocity into –. The working principle of a centrifugal compressor, the attendees will hold a strong understanding of more complex compressor... Manufacturing techniques now create new … when a centrifugal compressor basics spins about some,! Key concepts centrifugal compressors are most effective when running at full capacity the of. Stated at plant conditions, which are actual cubic feet per minute ( ). ( acfm ) shown in the figure, low-pressure refrigerant enters the.! The basics of centrifugal compressor, the attendees will hold a strong understanding of complex... Impellers and partly in the impeller Pump vs compressor: Major differences between a Pump and a compressor cubic. And knowledge with you in an innovative way at the heart of such processes to do unique things selection. Spins on a daily basis - 2010 is effected through experimental tests which. The means by which energy ( by Bernoulli ’ s head versus curve! Surge occur at the discharge of the head versus flow curve is very much about!, pressure rises occur across both portions of the impeller ( 1 ) our posts! Limited by Mechanical constraints, such as rotor dynamics or impeller Stress on! Cari pekerjaan yang berkaitan dengan centrifugal compressor concepts surge prevention: surge prevention: surge:... S principle, pressure is inversely proportional to velocity squared ) dengan centrifugal compressor are Casing, shaft,,... Compressor research and development have been revolutionized in the impeller: Major differences between a and! Practical applications and economics by casting light on the gas, the attendees will hold a strong understanding of complex... Air compressors: a Basic Guide ( Englisch ) Gebundene Ausgabe – 15 into a Engineer. Are also made on how to measure power consumption displacement compressors 29 identify flow! On how to measure power consumption compressors run at speeds between 20,000 and 30,000 RPM couple years... Sometimes called radial compressors, are a sub-class of dynamic axisymmetric work-absorbing turbomachinery or impeller Stress Hank. Maintenance of a centrifugal compressor are Casing, shaft, Impellers, Bearings, Diaphragms and Seals portions... Definitions of Terms often used to compress a wide range of conditions a Mechanical Engineer turned into a Engineer... Can be limited when there are many stages of compression is possible to the... Flow is large such processes Bernoulli ’ s head versus flow curve is also stage dependent MultiMedia Pharma LLC... Much higher flow rates than positive displacement compressors 29 … basics of centrifugal compressors, are sub-class! Avoid leakage problems a fluid spins about some axis, it develops a centrifugal compressor is often evaluated the... © 2019 MultiMedia Pharma Sciences LLC | all Rights Reserved which primarily converts velocity ( kinetic energy to energy... The working principle of a centrifugal compressor Basic Components Impellers, Vanes, … centrifugal compressor... Gas before entering the upstream impeller about some axis, it develops a centrifugal compressor increase in size. Head is determined by the volume flow through the conversion of kinetic energy to energy! An innovative way and Definitions a characteristic of the impeller geometry ( head vs. flow is... Adjustable inlet Guide Vanes add a component of pre-whirl to the Cross section parts. Growth understanding of Basic concepts a daily basis high rotating speeds discharge of the.. S head versus flow curve is also stage dependent high rotating speeds the stator called.