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Axial compressor

About: Axial compressor is a research topic. Over the lifetime, 12035 publications have been published within this topic receiving 127766 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors performed numerical analysis of a waterjet propulsion system to provide detail understanding of complicated three-dimensional viscous flow phenomena including interactions of intake duct, rotor, stator, and contracted discharge nozzle.

64 citations

Book
01 Jan 2006
TL;DR: In this paper, the authors present an overview of turbomachinery nomenclature, including axial flow turbines, radial inflow turbines, and centrifugal compressors.
Abstract: 1. Introduction to gas turbine engines 2. Overview of turbomachinery nomenclature 3. Aerothermodynamics of turbomachines 4. Energy transfer between a fluid and a rotor 5. Dimensional analysis, maps and specific speed 6. Radial equilibrium theory 7. Polytropic (small-stage) efficiency 8. Axial-flow turbines 9. Axial-flow compressors 10. Radial inflow turbines 11. Centrifugal compressors 12. Turbine-compressor matching.

64 citations

Book ChapterDOI
01 Jan 2006
TL;DR: In this paper, the authors focus on axial-flow turbines that are the most widely employed turbines using a compressible fluid Axial flow turbines power most of the gas turbine units and they are more efficient than radial-inflow turbines in most operational ranges.
Abstract: This chapter focuses on axial-flow turbines that are the most widely employed turbines using a compressible fluid Axial-flow turbines power most of the gas turbine units and they are more efficient than radial-inflow turbines in most operational ranges They are also used in steam turbine design; however, there are some significant differences between the axial-flow turbine design for a gas turbine and the design for a steam turbine Axial-flow turbines are now designed with a high work factor to obtain lower fuel consumption and reduce the noise from the turbine Lower fuel consumption and lower noise requires the design of higher by-pass ratio engines, and a high by-pass ratio engine in turn requires various turbine stages to drive the high-flow, low-speed fan The flow in axial-flow turbines enters and leaves in the axial direction There are two types of axial turbines: impulse type and reaction type Most axial flow turbines consist of more than one stage The front stages are usually impulse (zero reaction) and the later stages have about 50% reaction The impulse stages produce about twice the output of a comparable 50% reaction stage, while the efficiency of an impulse stage is less than that of a 50% reaction stage The high temperatures that are available in the turbine section have resulted from the improvements of the metallurgy of the blades in the turbines Development of directionally solidified blades as well as the new single-crystal blades, with the new coating cooling schemes, is responsible for the increase in firing temperatures The high pressure ratio in the compressor also causes the cooling air used in the first stages of the turbine to become hot

64 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that when the compressor is present, one can expect much more nearly a constant velocity into the compressor with attendant static pressure distributions to match with the total head variations ahead of the intake, with of course, the attendant curved flow to support the static pressure gradients.
Abstract: The tendency in the past has been to assume that when wakes or non-uniform total head profiles are fed into an axial compressor then substantially constant static pressure prevails at the entry, the variations in total head appearing as variations in velocity. This variation in velocity causes variation in incidence on the early stage blade rows and thus can give rise to excitation of blade vibration. This assumption is implicit, for instance, in References 1 and 2, but we think has been a common assumption by most of the people working in this field.Where the compressor is fed by a duct of substantially parallel walls for a reasonable length ahead, such an assumption appeared justifiable. Such a duct when given an air flow test with its outlet discharging, for instance, to atmosphere instead of to the compressor, then the distribution assumed would normally be obtained and in fact many surveys of such ducts have been represented in this fashion. The object of this note is to show that, in fact, this distribution will not normally occur when the compressor is present and we may normally expect much more nearly a constant velocity into the compressor with attendant static pressure distributions to match with the total head variations ahead of the intake, with of course, the attendant curved flow to support the static pressure gradients.

63 citations

Patent
02 Sep 1997
TL;DR: A multi-stage compressor with at least two compressor stages comprises an inter-cooler provided between the stages for cooling a gas being discharged from a compressor in the preceding stage as mentioned in this paper, which is possible to ensure a flow rate of gas required for cooling the motor during non-load operation with economy during load operation.
Abstract: A multi-stage compressor having at least two compressor stages comprises an inter-cooler provided between the stages for cooling a gas being discharged from a compressor in the preceding stage. The compressor stages are driven by a common electric motor, of which a rotating shaft is supported by magnetic bearings. A part of the gas cooled by the inter-cooler and a part of the work gas discharged from a bleed valve provided down-stream of a rear stage of the compressor are selectively introduced into the electric motor or the magnetic bearings. Thus, at the time of load operation the gas discharged from the inter-cooler is introduced into the motor or the magnetic bearings to cool them, and at the time of non-load operation the gas discharged from the bleed valve is introduced into the motor or the magnetic bearings to cool them. It is possible to ensure a flow rate of gas required for cooling the motor during non-load operation with economy during load operation.

63 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202398
2022304
2021217
2020288
2019316
2018353