轴流压气机机匣变形对多排转子流场特性的影响

doi:10.7527/S1000-6893.2016.0010

Abstract

Abstract:

In the actual machining, installation and using process, the problems of casing deformation, rotor eccentricity and nonuniform rotor blade heights exist to some extent in all axial-flow compressors, resulting in circumferential nonuniform tip clearance. With the deepening of the research on axial-flow compressor flow, the nonuniform clearance becomes the problem should be considered. The focus of this investigation is on the nonuniform clearance caused by casing deformation and its effect on the flow field characteristics of the rotor rows. The new parameter representing the nonuniformity of tip clearance is recommended, and the modeling approach for the nonaxisymmetry compressor is introduced. Three numerical models with different tip clearance nonuniformities are investigated by both steady and unsteady calculations. The effects of nonuniform clearance on aerodynamic performance and flow loss distribution are analyzed. The unsteady pressure fluctuation and aerodynamic force are also discussed. The results indicate that the nonuniform clearance can contribute to performance degradation and the circumferential asymmetrical flow field in blade tip regions. Due to the "wake" of the upstream blade row, flow field asymmetry of the back rotor row is more obvious than that of the front rotor row. There is direct correspondence between the nonuniform clearance layout and the aerodynamic force distribution in the circumferential direction. The blade aerodynamic force is higher at small tip clearance regions and lower at large tip clearance regions, increasing the amplitude of the aerodynamic force in casing deformation.

Key words: casing deformation, nonuniform tip clearance, performance, asymmetrical flow, aerodynamic force

CLC Number:

V231.3

CHEN Yingxiu, HOU Anping, ZHANG Mingming, ZHANG Simu. Effects of casing deformation on blade rows flow field characteristics in an axial-flow compressor[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(11): 3284-3295.

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Effects of casing deformation on blade rows flow field characteristics in an axial-flow compressor

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