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Topic: Axial flow compressor

	Axial compressor - Wikipedia, the free encyclopedia
		Axial compressors are compressors in which the fluid flows mainly parallel to the rotation axis.
		Axial flow compressors have large mass flow capacity and high efficiencies, but have a smaller pressure rise per stage than centrifugal compressors.
		Axial compressors are essentially a steam turbine reversed; instead of high-pressure gas flowing into the turbine and forcing it to rotate to provide power, in the compressor role power is provided from an external source in order to spin the system and compress the gas.
	en.wikipedia.org /wiki/Axial-flow_compressor (2472 words)

	Gas compressor - Wikipedia, the free encyclopedia
		Compressors are loosely related to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe.
		As gases are compressible, the compressor also reduces the volume of a gas, whereas the main result of a pump raising the pressure of a liquid is to allow the liquid to be transported elsewhere.
		Air compressors sold to and used by the general public are often attached on top of a tank for holding the pressurized air.
	en.wikipedia.org /wiki/Air_compressor (1142 words)

	Axial-flow compressor - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-10-18)
		The axial flow compressor is an improvement on the centrifugal compressor previously used in turbine engines,though small and micro turbines use centrifugal compressors with relative advantages (in terms of pressure ratios achieveable per stage of compression).
		There are then multiple compressor stages, each consisting of a set of rotating blades (much like a propeller) that force the gas to the rear, and then a set of fixed stator blades that condition the air ready for the next compressor stage.
		Axial flow compressors are typically used in the compression stage of turbine engines.
	www.arikah.com /encyclopedia/Axial-flow_compressor (233 words)

	Encyclopedia: Axial-flow compressor (Site not responding. Last check: 2007-10-18)
		There are then multiple compressor stages, each consisting of a set of rotating blades (much like a propeller) that force the gas to the rear, and then a set of fixed stator blades (i.e.
		Axial flow compressors are typically used in the compression stage of gas turbine engines.
		On some axial compressors the rear stages become too small to be robust, so a centrifugal compressor is often used to terminate the compression process (e.g.
	www.nationmaster.com /encyclopedia/Axial_flow-compressor (525 words)

	Stall prediction method for axial flow compressor - US Patent 6715984 (Site not responding. Last check: 2007-10-18)
		A stall prediction method for an axial flow compressor according to claim 1, wherein a plurality of said pressure sensors are disposed in the circumferential direction of the axial flow compressor for obtaining time history data at various positions of one rotor blade.
		Since the air flow is least stable in the vicinity of the leading edge of the rotor blade, it is possible to find the smallest change of the air flow and to predict the stall occurrence in advance by providing the pressure sensor adjacent to the leading edge of the rotor blade.
		In contrast, since the flow near the leading edge of the rotor blade 12 is most stable, it is desirable for accurate and reliable detection of the indication to dispose the high response pressure sensor adjacent to the leading edge as a position in the axial direction.
	www.patentstorm.us /patents/6715984.html (2708 words)

	Wind Tunnels - Axial Fan (Site not responding. Last check: 2007-10-18)
		Because it is necessary to return to uniform, non-swirling flow in a circular or polygonal section downstream of the fan, the diameter of the central nacelle ("boss", "hub") is usually a smaller fraction of the fan diameter than in multi-stage compressor practice, and rarely exceeds 0.5 to 0.6 of the fan diameter.
		Axial fans have a much more limited operating range (in terms of the pressure-rise coefficient, defined as the ratio of pressure rise through the fan to the dynamic pressure of the flow) than centrifugal blowers.
		It must be said that the outlet flow frm a centrifugal blower is disturbed at the best of times, but not much worse than the likely condition of the flow at exit from the main diffuser of a closed-circuit tunnel.
	vonkarman.stanford.edu /tsd/pbstuff/tunnel/axialfan.html (815 words)

	Axial flow fluid compressor with angled blade - US Patent 4872820 (Site not responding. Last check: 2007-10-18)
		A compressor according to claim 1., wherein said driving means includes an electric motor section for rotating the cylinder and transmitting means for transmitting the rotational force of the cylinder to the rotary member so as to rotate the rotary member interlockingly with the cylinder.
		A compressor according to claim 3, wherein said transmitting means includes an engaging groove formed in the outer periphery of the rotary member, and a projecting portion extending from the inner peripheral surface of the cylinder and fitted in the engaging groove to be movable in the radial direction of the cylinder.
		In these conventional compressors, a structure of a drive unit such as a crankshaft for transmitting a rotational force to a compression section and a structure of the compression section are complex, and the number of components used in the compressor is large.
	www.patentstorm.us /patents/4872820.html (3938 words)

	Axial flow compressor rotor drum - Patent 4191510
		A rotor driven for an axial flow gas turbine engine compressor is formed as a composite structure of inner and outer skins with a core therebetween and a set of tensile reinforcing rings each located in a respective groove of a corrugated outer surface of the drum.
		The drum for a compressor rotor as defined in claim 1 wherein a cone is mounted on a front face of said drum for connection to a compressor drive shaft.
		The drum for a compressor rotor as defined in claim 7 wherein compressor blades are positioned in the recesses in the drum under a locking skirt for the blades, said locking skirt having at one end a flange fixed to the cone and at the other end, a flange fitted on the drum.
	www.freepatentsonline.com /4191510.html (3044 words)

	Compressor Section - Generic Information
		The dual compressor is a combination either of two axial compressors or of an axial and a centrifugal compressor (Figure 4).
		The dual-axial compressor consists of a low-pressure compressor in front and a high-pressure compressor in the rear.
		The axial compressor and centrifugal compressor combination is mounted on the same shaft; the compressors turn in the same direction and at the same speed.
	www.aircav.com /gencompr.html (2327 words)

	Engine Glossary - UEET (Site not responding. Last check: 2007-10-18)
		The normal parts of a compressor include: compressor front frame, compressor casing with stator vanes, a rotor with rotor blades and a compressor rear frame.
		axial flow compressor - The direction of the flow of compressed air is parallel to the spool axis.
		It is a function of the flow current (ampere) and the amount of resistance to flow (ohm) present.
	www.ueet.nasa.gov /glossaries/EngineGossary.html (2031 words)

	Method and apparatus for optimizing the vane clearance in a multi-stage axial flow compressor of a gas turbine - Patent ...
		In accordance with the invention, a portion of the compressed air which flows axially in the annular flow channel of the compressor is removed for thermal control of the rotor disks by heat exchange therewith.
		The air flows from the flow channel as leakage air between the adjoining edges of the intermediate rings 37 and 38 and the root portions 5", 35" and 36" of the rotor vanes.
		The axial diffuser 2 and the guide vanes 1 are connected as a unit and arranged radially outwards of a stationary part 23 of the main rotor seal which, in turn, is radially outwards of seal support R on the supporting disk 22.
	freepatentsonline.com /4795307.html (4067 words)

	Axial Compressors
		Axial flow compressors are designed for high volume, high efficiency and high reliability applications.
		Pressure ratio is determined by the number of stages and flow is varied by changing the length of the blades.
		Axial compressor design and there associated components are always being reviewed for improvement.
	www.dresser-rand.com /Turbo/eq/axialcomp.asp (504 words)

	The supersonic axial-flow compressor (Site not responding. Last check: 2007-10-18)
		Preliminary calculations showed that very high pressure ratios across a stage, together with somewhat increased mass flows, were apparently possible with compressors which decelerated air through the speed of sound in their blading.
		As an approach to the study of supersonic compressors, three possible velocity diagrams are discussed briefly.
		In this compressor, air decelerates through the speed of sound in the rotor blading and enters the stators at subsonic speeds.
	naca.larc.nasa.gov /reports/1950/naca-report-974 (177 words)

	Broad spectrum vibration damper assembly fixed stator vanes of axial flow compressor - Patent 4285633
		The damper assembly includes: A metal seal strip member having indentations; a metal sine wave-shaped damper and spring member that is complementary to, and is engaged with, the seal strip member; and, a honeycomb member affixed to the bottom surface of the seal strip member.
		One of the advances in the state-of-the-art of axial flow compressors has been the fabrication of fixed stator vane rows in sectors (i.e., sections or portions).
		2 is a perspective view, in simplified form of a typical annular row of stator airfoil vanes for use in an axial flow compressor, with the vanes interposed between a sectored outer shroud and a sectore inner shroud;
	www.freepatentsonline.com /4285633.html (1621 words)

	Rotor or stator blades for an axial flow compressor - Patent 4671738
		For these secondary flows to exist, radial pressure gradients must exist along the blades, and these radial pressure gradients are produced by the interaction between the aerofoils and the boundary layer on the outer and inner walls of the flow annulus of the compressor.
		This simple relationship, together with the conventional treatment of flows in an axial flow compressor, enable the parameters of the aerofoils to be determined in sequence throughout the compressor.
		Since the axial velocity profile in the boundary layer is known theoretically or empirically, the value of Vwgv may be calculated for each element of the aerofoil and hence the camber angle variation of the guide vane aerofoil determined.
	www.freepatentsonline.com /4671738.html (1826 words)

	Rotor of a compressor, more particularly of an axial-flow compressor - Patent 4671735
		The rotor of an axial-flow compressor with means for sealing the rotor blade tips relative to a casing wall provided with a coating is to be capable of abrasion but at the same time also low in wear.
		The present invention resolves these contradicting requirements for the coating on the casing in that individual blades, arranged between normally contoured, unshrouded rotor blades, are widened at their tips and reinforced with a radially outer layer, the material of which is matched to that of the coating.
		In compressors, especially axial-flow compressors, efficiency and operating behavior depend to a large extent on the ability to keep the width of the radial clearance or gap between the rotor blades and the casing as small as possible.
	freepatentsonline.com /4671735.html (2172 words)

	EPRI: Axial Compressor Performance Maintenance Guide (Site not responding. Last check: 2007-10-18)
		The axial compressor is a critical component of any combustion turbine power generation unit.
		Compressor thermodynamic and operating principles are complex, making it difficult for many CT managers to understand the relevance of several compressor O&M practices.
		Hence, knowledge of axial compressor principles and practices is necessary to maximize profit from a CT power plant.
	www.epri.com /OrderableitemDesc.asp?product_id=TR-111038 (449 words)

	AXIAL FLOW COMPRESSOR
		A rotary compressor having interdigitated rows or stages of rotary and of stationary blades through which the flow of fluid is substantially parallel to the rotor's axis of rotation.
		A type of air compressor in which air is compressed in a series of stages as it flows axialy through a decreasing tubular area.
		The direction of the flow of compressed air is parallel to the spool axis.
	www.websters-online-dictionary.org /ax/axial+flow+compressor.html (149 words)

	FM 1-506 Glossary (Site not responding. Last check: 2007-10-18)
		It is behind the compressor and receives the compressed air which is mixed with fuel and ignited.
		In the combustor, a diffuser forms a divergent flow path for the exhaust gases.
		They are located in front of the first compressor rotor, and they control the angle of incidence of the inlet air, thus ensuring a compressor surge margin.
	www.cavalrypilot.com /fm1-506/Gloss.htm (2957 words)

	Method for the manufacture of metal vanes for turbomachinery - Patent 4531270
		To make vane airfoils for an axial flow compressor metal strip is first contour rolled to a cross section comprised of two opposing airfoils separated by a center rib, where one of the faces of the strip is kept planar.
		In the compressor section of an axial flow turbomachine, there are both vanes and blades.
		The present invention is described in terms of the making of a vane for an axial flow turbomachine, where the vane has the nominal size described in the Background and is made of a wrought nickel superalloy such as Waspaloy, IN-718 or Inconel X-750.
	www.freepatentsonline.com /4531270.html (2868 words)

	DESIGNING A COMPRESSOR
		Indeed, centrifugal-flow compressors have a relatively large frontal area due to the size of the impeller, and are therefore much less suitable when air resistance is to be minimised.
		Indeed, if there is an excessive amount of air flowing through any one stage of the compressor, the airflow may break down altogether.
		This design allows for some of the air discharged by the front compressor to be evacuated, controlling the airflow that is allowed into the rear compressor.
	www.bath.ac.uk /~en3abo/gasturbines/compressor.htm (478 words)

	Nonlinear Control and Modeling of Rotating Stall in an Axial Flow Compressor - Behnken (ResearchIndex) (Site not responding. Last check: 2007-10-18)
		Abstract: This thesis focuses on understanding the use of air injection as a means of controlling rotating stall in an axial flow compressor, involving modeling, dynamical systems analysis, and experimental investigations.
		32 A theory of post-stall transients in axial compression syste..
		5 A theory of rotating stall in multistage axial compressors:..
	citeseer.ist.psu.edu /21497.html (821 words)

	22
		Axial flow compressor, rotating stall and surge stability, compressor map.
		Fundamentals of turbo-machinery with emphasis on axial flow compressors and turbines.
		Each student is then given a changed engine parameter such as a loss in turbine efficiency, bleed flow from compressor, increased burner pressure loss, etc.
	m-5.eng.uml.edu /abet/22484.htm (374 words)

	FEDSM99-7196: Visualization of Multiple Stall Cells Propagating in an Axial Flow Compressor Rotor
		This paper describes visualization of multiple stall cells propagating in an axial compressor rotor.
		On the basis of the 25 time dependent averaged flow fields, the animations have been made to visualize the flow behavior of the stall cell propagation.
		The reverse flows appeared upstream and downstream of the rotor are resulted from this vortical flow.
	asme.pinetec.com /fedsm1999/data/s-291/7196.html (149 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		An experimental investigation of the wake behind on axial flow compressor rotor/Ali Hajilouy-Benisi; Supervised by: J.W. Railly.
		Measurement of the three dimensional blade-to-blade flow structure downstream of an isolated compressor rotor over two blade piches were considered.
		A brief review of the flow nature within the axial flow compressor in addition to the previous theoretical and experimental work on the wake study is also included.
	dbase.irandoc.ac.ir /00227/00227112.htm (239 words)

	axial-flow compressor \| TutorGig.co.uk Encyclopedia (Site not responding. Last check: 2007-10-18)
		Instrumentation used in measurement of the three dimensional flow in a..
		Alternating pressures and blade stresses in an axial-flow compressor (..
		Analysis of the air flow through four stages of half-vortex blading in..
	www.tutorgig.co.uk /ed/axial-flow_compressor (392 words)

	Radial flow vs. axial flow compressor : RC Universe! The Ultimate RC forum (Site not responding. Last check: 2007-10-18)
		With axial compressors you would need several stages to get the same pressure in the combustion-chamber, resulting in a more advanced engine with a lot of high-tec parts (like in the full-size engines), and the cost would reach levels previously unheard of.
		In an axial compressor stage, the high and low pressure areas are divided by the compressor disc itself, and the leakage path is between the blade tips and the casing.
		So, the smaller you make an axial flow compressor the less efficient it becomes (since the gap between blade tip and casing cannot be reduced in proportion (commercial turbofans have a clearance of less then a milimeter, with blades up to a meter long...).
	utopia.rcuniverse.com /rcarchive/26/2003/08/4/196546 (2385 words)

	Zucrow Laboratories@Purdue
		In fact it is this inherent unsteadiness that enables the flow field and the compressor and turbine blades to exchange energy.
		Specifically, unsteady flow phenomena are directly responsible for: (1) flow induced vibrations, both flutter and forced response, (2) off-design performance limitations including surge line management, and (3) aeroacoustics, specifically discrete frequency noise generation.
		With unsteady flow being the driving phenomena for these technical areas which have a primary effect on advanced engine design, development and performance, the research at RAMP is directed at unsteady flow in turbomachines.
	widget.ecn.purdue.edu /~ramp (327 words)

	Paper Abstract (Site not responding. Last check: 2007-10-18)
		This paper presents preliminary results on the use of low flow, high momentum, pulsed air injectors to control the onset of stall in a low-speed, axial flow compressor.
		By measuring the unsteady pressures in front of the rotor, the controller determines the magnitude and phase of a stall cell and controls the injection of air in front of the rotor face.
		An explanation of this effect is proposed based on the quasi-steady effects of air injection on the compressor characteristic curve.
	www.cds.caltech.edu /~murray/papers/1995b_dbm95-spie.html (136 words)

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