Experimental characterization of stall phenomena in a single-stage low-pressure axial compressor

Abstract

The experimental characterization of the rotating stall phenomena appearing in a single-stage high-speed low-pressure axial compressor is presented in this paper. The compressor design is representative of an advanced direct drive turbofan booster. The stage is equipped with both fast response and steady instrumentation. Fast response pressure sensors are placed in the rotor casing and in the hub at the outlet of each row. The former are employed to perform a detailed survey on the tip leakage flows, and the latter allow to determine the extension of the stall cells across the stage. A fast response aerodynamic pressure probe is located at the rotor outlet to detect the size of the stall cells. The global performances of the machine are recorded by time-averaged measurements at the inlet and at the outlet of the stage. Tests recording the stall inception and the complete stall transients are performed at different speed lines in the VKI-R4 closed loop compressor test rig. The inception mechanism is determined by the comparison between the time mean and the time-resolved data. In terms of stall inception, the compressor exhibits long length scale at lower rotational speed and an abrupt stall at higher rotational speed. The characterization of the stall cells is performed in terms of number, size, and speed by using the unsteady data acquired with the fast response instrumentation. The compressor presents a single full span stall cell in all the speed lines investigated.

Keywords

Compressor instability axial flow compressors compressor aerodynamics compressor performance

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References

Sans J, Dell’Era G, Desset J, et al. Performance and stability testing of a low pressure compressor. In: Proceedings of European Turbomachinery Conference 10, Lappeenranta, Finland, 2013.

Dieck

. Measurement uncertainties – methods and applications, USA: ISA, 2007.

Camp

Day

. A study of spike and modal stall phenomena in a low speed axial compressor. J Turbomach 1998; 120: 393–401.

Mailach

Lehmann

Vogeler

. Rotating instabilities in an axial compressor originating from the fluctuating blade tip vortex. J Turbomach 2001; 123: 453–463.

Courtiade

Ottavy

. Experimental study of surge precursors in a high-speed multistage compressor. J Turbomach 2013; 135: 061018–061018.

Diez NG, Smeulers JPM, Tapinassi L, et al. Predictability of rotating stall and surge in a centrifugal compressor stage with dynamic simulations. In: Proceedings of ASME Turbo Expo 2014, Dusseldorf, Germany, paper no. GT2014-26712, pp. V02DT44A032. New York: ASME.

Lin

Chen

. Wavelet analysis of rotor-tip disturbances in an axial flow compressor. J Propul Power 2004; 20: 319–334.

Hellmich

Seume

. Causes of acoustic resonance in a high-speed axial compressor. ASME J Turbomach 2008; 130: 031003–031003.

Levy Y and Pismenny J. The number of stall cells during rotating stall. In: Proceedings of ASME Turbo Expo 2003, GT2003-38221.

10.

Van de Wyer N. Experimental study of the performance and stability of a low pressure axial compressor for a contra rotating turbofan engine architecture. PhD Thesis, Université catholique de Louvain—von Karman Institute for fluid dynamics, 2012.