Numerical Simulation of Rotating Stall in a Subsonic Compressor

Gourdain, Nicolas; Burguburu, S.; Leboeuf, Francis; Miton, Hubert

doi:10.2514/6.2004-3929

Cited by 9 publications

(9 citation statements)

References 4 publications

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“…Desprendimiento Rotativo: como ya se ha explicado, es una inestabilidad aerodinámica circunferencialmente no uniforme bidimensional, que se propaga alrededor de la sección anular del compresor a una velocidad menor que la velocidad de rotación del rotor [26][86]; se ha determinado que se desplaza a una velocidad de entre 20 y 70 % de la del rotor [42] [77]. Se caracteriza por el ruido que produce junto a vibraciones en los perfiles del rotor [100].…”

Section: Sección 23 Capítulounclassified

Contribución a la Mejora del Margen de Bombeo en Compresores Centrífugos de Sobrealimentación

Lang¹,

Ricardo²

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Section: Sección 23 Capítulounclassified

Contribución a la Mejora del Margen de Bombeo en Compresores Centrífugos de Sobrealimentación

Lang¹,

Ricardo²

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“…It is referred to the direct dissipation. Equation (8), containing the gradients of the fluctuating velocities hence is the entropy production by dissipation in the fluctuating part of the flow field. It is referred to the indirect dissipation.…”

Section: Entropy Generation Calculationmentioning

confidence: 99%

“…Meanwhile, some researchers have worked on the details of the flow field during stalls based on numerical simulations. Gourdain [8,9] numerically studied the rotating stall in a subsonic compressor, and discovered that stall cells are caused by the upstream flow disorganization and rotating stalls are initiated by an up-stream modal wave. Choi [10] found that the mis-staggered blade is instrumental to stall initiation because the increasing blade loading intensified the tip leakage flow to cause spillage around the leading edge of the trailing blade.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Entropy Generation under Stall Conditions in a Centrifugal Fan

Zhang

Lang

Jiang

et al. 2014

Entropy

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Rotating stalls are generally the first instability met in turbomachinery, before surges. This 3D phenomenon is characterized by one or more stalled flow cells which rotate at a fraction of the impeller speed. The goal of the present work is to shed some light on the entropy generation in a centrifugal fan under rotating stall conditions. A numerical simulation of entropy generation is carried out with the ANSYS Fluent software which solves the Navier-Stokes equations and user defined function (UDF). The entropy generation characteristics in the centrifugal fan for five typical conditions are presented and discussed, involving the design condition, conditions on occurrence and development of stall inception, the rotating stall conditions with two throttle coefficients. The results show that the entropy generation increases after the occurrence of stall inception. The high entropy generation areas move along the circumferential and axial directions, and finally merge into one stall cell. The entropy generation rate during circumferential propagation of the stall cell is also discussed, showing that the entropy generation history is similar to sine curves in impeller and volute, and the volute tongue has a great influence on entropy generation in the centrifugal fan.

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“…There are primarily two types of instabilities that occur in the flow through the compressor: surge and stall [2]. Surge is described by large oscillations of the mean mass flow through the engine, that may become reversed, pushing the air back on the front of the engine.…”

Section: Introductionmentioning

confidence: 99%

Measurement and analysis of vibrations of the axial-flow compressor caused by inlet flow instability during the flight of aircraft

Zakic-Nedeljkovic¹,

Simonović²,

Stupar³

et al. 2015

Sci Tech Rev

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This paper presents a practical example of the measurement and analysis of vibrations in the first two stages of the axial-flow compressor with intention to estimate a connection between inlet air flow distortions and appearance of stalling of the compressor blades. The inlet air flow distortions were tested during different regimes of the aircraft flight with a maximum thrust, with an assumption that the asymmetry of air flow through the twin-inlets existed and had effect on vibrations of the compressor. The paper shows the measurement of vibrations on the Galeb G-2 aircraft powered by the Rolls Royce Viper Mk22-6 engine with the aim to recognize and define the minimum necessary data for detection of the potential distorted air flow through the compressor, as concequences of an unequal air flow distribution in the inlets. The detection capability of this methodology of measurement is presented using the fast Fourier transform (FFT). The proposed methodology of measurement and analysis can be implemented in different types of aircraft in order to research the occurrence of stall and surge.

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Numerical Simulation of Rotating Stall in a Subsonic Compressor

Cited by 9 publications

References 4 publications

Contribución a la Mejora del Margen de Bombeo en Compresores Centrífugos de Sobrealimentación

Contribución a la Mejora del Margen de Bombeo en Compresores Centrífugos de Sobrealimentación

Simulation of Entropy Generation under Stall Conditions in a Centrifugal Fan

Measurement and analysis of vibrations of the axial-flow compressor caused by inlet flow instability during the flight of aircraft

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