| Citation: | LI Ziliang, CHEN Yufei, WANG Nan, et al. Influence of elliptical casing deformation on aerodynamic loss performance of subsonic compressor rotor[J]. Journal of Aerospace Power, 2026, 41（5）：20240642 doi: 10.13224/j.cnki.jasp.20240642
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Focusing on a subsonic axial-flow compressor, the typical flow characteristics and loss characteristics of a subsonic axial-flow compressor with elliptical deformation of the casing were investigated by means of a calibrated numerical method at 53% design speed. The results indicated that the flow and loss in the tip region of the compressor blade were deteriorated as the deformation degree of the casing increased, and the aerodynamic efficiency of the compressor decreased more sharply with a peak efficiency decrease of up to 2.1%. The deterioration of tip flow under casing deformation was due to circumferential distortion of the upstream flow field of the rotor and its induced flow losses: the uneven circumferential clearance at the blade tip led to distortion of the upstream pressure potential field in the maximum blade tip clearance channel of the rotor, forming a pressure gradient and circumferential secondary flow in the direction of blade rotation, inducing low-energy fluid to migrate and accumulate towards the circumferential position deviating from the maximum blade tip clearance and forming a high loss region. The loss circumferential distribution exhibited a “phase shift” phenomenon. Compared with the change in rotor tip clearance under casing deformation which led to an increase in leakage loss, the upstream loss distortion of the rotor had a more profound impact on the internal tip loss of the rotor. On the one hand, it determined which blade channel the peak loss region lied in, and on the other hand, the development and evolution within the rotor induced larger tip leakage loss.
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