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Tuesday, November 10, 2020 | History

2 edition of Rotating stall behaviour of an axial-flow compressor rotor. found in the catalog.

Rotating stall behaviour of an axial-flow compressor rotor.

Pritam Babu Sharma

Rotating stall behaviour of an axial-flow compressor rotor.

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  • 21 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D.)-University of Birmingham, Dept. of Mechanical Engineering.

ID Numbers
Open LibraryOL20661288M

An axial compressor is a machine that can continuously pressurise gases. It is a rotating, airfoil-based compressor in which the gas or working fluid principally flows parallel to the axis of differs from other rotating compressors such as centrifugal compressors, axi-centrifugal compressors and mixed-flow compressors where the fluid flow will include a "radial . In this investigation, casing mounted high frequency response pressure transducers are used to characterize the flow behavior near the aerodynamic stability limit of a low speed single stage axial flow compressor. Time variant pressure measurements are acquired at discrete operating points up to the stall inception point and during the transition to rotating stall, for a length of . E3 compressor up to rotor revolutions prior to stall. Precursors are also detected on the high speed Viper compressor up to and rotor revolutions prior to stall for 81% and 83% of corrected speed, respectively. The precursor is found to be caused by the formation and decay of spikes as the compressor nears stall. For conditions even.


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Rotating stall behaviour of an axial-flow compressor rotor. by Pritam Babu Sharma Download PDF EPUB FB2

Rotating Stall. Rotating, or propagating stall, was first observed by Whittle and his team on the inducer vanes of a centrifugal compressor. Rotating stall (propagating stall) consists of large stall zones covering several blade passages and propagates in the direction of the rotation and at some fraction of rotor speed.

The number of stall. To investigate the pre-stall behavior of an axial flow compressor rotor, which was experimentally observed with spike-type stall inception, systematic experimental and whole-passage simulations were laid out to analyze the internal flow fields in the test by:   Unsteady Flow and Aeroelasticity Behavior of Aeroengine Core Compressors During Rotating Stall and Surge 6 May | Journal of Turbomachinery, Vol.

No. 3 Role of Hub-Corner-Separation on Rotating Stall in an Axial CompressorCited by:   When the compressor was connected to the capacity tank, surge was generated with rotating stall in accordance with the capacitance increment of whole compressor system.

The surge behavior changed irregularly with throttling valve installed behind the compressor, and several types of surge cycles were by: 5.

Stalling is an important phenomenon that affects the performance of the compressor. An analysis is made of rotating stall in compressors of many stages, finding conditions under which a flow distortion can occur which is steady in a traveling refe.

Rotating stall, as a typical kind of flow instability in aero-compressor, could lead to disastrous consequences of aeroengine. Therefore, an effective method is perused to enhance the stall. The hypothesis and scenario developed are consistent with numerical simulations and experimental observations of axial compressor stall inception.

A comparison of calculations for multiple blades with those for single passages also allows statements to be made about the utility of single passage computations as a descriptor of compressor stall.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA International Journal of Rotating Machinery Axial Compressor Stall and Surge Prediction by Measurements 0 Institut jFtr Strahlantriebe und Turboarbeitsmaschinen, RWTH Aachen /Aachen University The paper deals with experimental investigations and analyses of unsteady pressure distributions in different axial compressors.

Avoidance of severe axial compressor rotating stall Prevention of blade rubbing in the compressor or turbine due to an increased rate of thermal Rotating stall behaviour of an axial-flow compressor rotor. book and vibration Although these are all important issues, this paper focuses only on the issue of axial compressor rotating stall during startup as shown highlighted in red in Figure 1.

Identification of a one-stage axial compressor system is addressed. In particular, we investigate the underlying dynamics of tip air injection and throttle activation to the overall compressor dynamics and the dynamics around the tip of the compressor Rotating stall behaviour of an axial-flow compressor rotor.

book. A proposed subspace system identification algorithm is used to extract three mathematical models: relating the tip air. As a typical rotating machine, axial-flow fan is widely used in the field of national economy due to its advantages of large air volume, good ventilation effect, high efficiency and energy savings [1,2,3].With the development of high speed and high power in the field of rotating machinery, the axial flow fan needs to meet the design indexes of high efficiency, low noise and stable.

Rotating stall, which corresporids to a traveling v-,rave of gas around the annulus of the compressor~ occurs when a nonaxisymmetric flow disturbance develops (around the annulus of the rotor) and causes severe reduction in the perfor­mance of the compressor.

As rotating stall devel­ops, axisymmetric oscillations across the compres­sion. Akhmedzyanov's 9 research works with 16 citations and reads, including: Computer-Aided Design and Construction Development of the Main Elements of Aviation Engines.

Experimental studies on stall behavior in a single stage transonic axial flow compressor Conference Paper (PDF Available) December with 81 Reads How we measure 'reads'. Interaction between surge behavior and internal flow field under coexisting phenomena of surge and rotating stall was experimentally investigated.

In the experiment, the tank pressure of the compressor during surge was measured to detect the effect of the back-pressure fluctuation on the change in the internal flow field. There are two types of compressor stall: Rotating stall.

Rotating stall is a local disruption of airflow within the compressor which continues to provide compressed air, but with reduced effectiveness. Rotating stall arises when a small proportion of airfoils experience airfoil stall, disrupting the local airflow without destabilising the stalled airfoils create.

An axial compressor is a gas compressor that can continuously pressurize is a rotating, airfoil-based compressor in which the gas or working fluid principally flows parallel to the axis of rotation, or differs from other rotating compressors such as centrifugal compressor, axi-centrifugal compressors and mixed-flow compressors where the fluid flow.

Rotating Stall Induced Vibration Identification during Speed Ramp. Different rotating stall induced vibration phenomenon is first found by speed ramp testing method.

The centrifugal compressor is first set to run at % Ω norm speed and the mass flow is also adjusted to low flow rate to make the impeller disturbed by the rotating stall.

Wu, Y, Wu, J, Zhang, G. Experimental and numerical investigation of flow characteristics near casing in an axial flow compressor rotor at stable and stall inception conditions.

J Fluids Eng ; –   By damping the small amplitude waves rotating about the annulus prior to stall, they increased the stable flow range of the compressor by 25%. The control scheme adopted comprised a circumferential array of hot wires just upstream of the compressor and a set of 12 individually actuated vanes upstream of the rotor used to generate the rotating.

Axial-flow compressors are used in the majority of large gas turbines, both in powerplants and aircraft jet engines. Compressor surge. Rotating stall can morph into the extreme case of a compressor performance failure called surge. One rotor revolution for an aircraft gas turbine typically is about 5 msec, while for a large IGT might it.

tion of rotating stall and the inception of surge are shown to be the same phe-nomena. An analytical dynamic model (DYNTECC) is applied to one of the compression systems and the results are compared to data. The results show that the model can capture the global effects of rotating stall and surge.

The. Rotating stall limits the operating range and stability of the centrifugal compressor and has a significant impact on the lifetime of the impeller blade.

This paper investigates the relationship between stall pressure wave and its induced non-synchronous blade vibration, which will be meaningful for stall resonance avoidance at the early design phase.

rotor behavior does not allow for details of particular flow patterns, but treats the fluid (gas) “in average,” which falls in the scale of rotor motion. Experimental Compressor for Rotating Stall An experimental rig (Figure 1) is constructed to evaluate Dynamic Stiffness for the rotor/fluid system during rotating stall and during normal.

Unsteady numerical simulations of a counter-rotating axial compressor are performed to investigate the unsteady effects of rotor–rotor interaction process and the tip flow unsteady behavior near the stall operating condition.

The results show that potential effects from the rear rotor have a more pronounced influence on the front rotor. @article{osti_, title = {Active suppression of rotating stall and surge in axial compressors}, author = {Day, I J}, abstractNote = {This paper reports on an experimental program in which active control was successfully applied to both rotating stall and surge in a multistage compressor.

Two distinctly different methods were used to delay the onset of rotating stall in. Figure Three-stage axial-flow compressor apparatus 40 Figure ; Blade-to-blade view of three-stage, axial-flow compressor blade rows 41 Figure Three-stage axial-flow compressor results, inlet guide vane an­ gle variation, A = 6°, n = 2 cycles/rev, rotor.

explicit conditions for local stability of rotating stall offer new insight into the design, and active control for axial flow compressors. A schematic axial flow compressor is shown in Figure 1.

The following notation is used in this paper: R = mean rotor radius Ic = 11 + l~. ~/a Ao = compressor duct area V e = volume of plenum. LAxial Flow Compressor Design, Inter Spool Duct LDesign of Compressor Blades, Aerofoil Design (Subsonic, Transonic, Supersonic Profiles) LDesign of Compressor Blade: 3D Blade Shapes of Rotors and Stators.

Rotating stall and surge reduce performance drastically, so these instabilities should be properly respected in axial compressor design and operation. Stalling, a kind of flow distortion, is an important phenomenon that affects the performance and reliability of an axial compressor.

An investigation of the surge behavior of a high-speed ten-stage axial flow compressor. View/ Open. found that the speed boundary between surge and rotating stall occurred between 80% and 81 % corrected design rotor speeds. 1hls boundary did not change when the compressor discharge volume was increased or decreased.

it remains the most. speed single stage axial flow compressor. Time variant pressure measurements are acquired at discrete operating points up to the stall inception point and during the transition to rotating stall, for a length of time no shorter than rotor revolutions.

The experimental. In a compressor used for power generation, a rotating stall due to an operating point mismatch between the front and rear stages occurs at front stages in low-speed condition during startup.

IGV, VSV opening schedule and bleed flow rates are determined in order to obtain stable operating conditions, with the occurrence of pressure fluctuations. axial-flow compressor with a high design flow coefficient (9= ) at.

rpm lower than the design ones. A detailed description of the rotating stall during the so-called "modified surge" is given.

In this surge type the rotating stall exists during all the surge cycle, in. The rotating stall precedes a full scale surge in which the compressor stalls in the entire circumference.

Centrifugal Compressor is a machine in which a particular gas or vapor is compressed by a radial acceleration by an impeller with the help of a surrounding case. It can then be arranged multistage for greater proportions of compression.

User Tools. Cart. Sign In. backwards relative to the rotor is an elaboration of the same argument: if one flow passage stalls, the swirling incoming flow is re-routed such that the passage ahead of the one stalled sees a more axial flow, while the one behind sees a larger incidence angle.

The stall moves to this trailing passage, and the stalled passage clears. an experimental study of rotating stall in axial-flow compressor stages with different types of profiling along the blade height and with different calculated regimes of flow past a profile in the cascade was conducted.

QUICK TAKE. Stall and surge in aircraft engines are characterized by a breakdown in airflow through the engine’s air compressor, and can often result from mechanical failures.; When stall and surge occur, changes in air pressure and direction can increase stress and vibration in the engine blades, which can cause sudden banging sounds.

Although stall and surge are. axial-flow compressors. ROTATING STALL / \ CIRCUMFERI'NTIAI,I.Y NONUNIFORM SURGE AXIALLY FI,OW Figure 1. Rolating Stall and Surge Events in an Axial Flow Compressor One approach for determining prestall behavior of the compressor exists based on the assumption that rotating stall is primarily a linear event and can be.mostly in the area of fluid dynamic design, rotating stall and rotordynamics.

He presently holds five patents. Andrea Bernocchi is an engineering manager at GE Oil&Gas. He joined GE in as Centrifugal Compressor Design Engineer after an experience in plastic machinery industry. He has 18 years of.Response to rotating tip clearance asymmetries induced by a whirling rotor shaft or rotor height variations were investigated with a two-dimensional flow model.

A 3-D compressor model was also developed to study the stability of both full-span and part-span rotating stall modes in annular geometries with radial flow variations.