Yangwei Liu

Numerical Study of the Effect of Secondary Vortex on Three-Dimensional Corner Separation in a Compressor Cascade

Abstract The complex flow structures in a linear compressor cascade have been investigated under different incidences using both the Reynolds-averaged Navier–Stokes (RANS) and delayed detached eddy simulation (DDES) methods. The current study analyzes the development of horseshoe vortex and passage vortex in a compressor cascade based on DDES results and explores the effect of the passage vortex on corner separation using the RANS method. Results show that the effect of horseshoe vortex on three-dimensional corner separation is weak, whereas the effect of passage vortex is dominant. A large vortex breaks into many small vortices in the corner separation region, thereby resulting in strong turbulence fluctuation. The passage vortex transports the low-energetic flow near the endwall to the blade suction surface and enlarges corner separation in the cascade. Hence, total pressure loss increases in the cascade.

Computational Model for Stall Inception and Nonlinear Evolution in Axial Flow Compressors

This paper presents a computational model for axial compressor stall inception and its nonlinear evolution using unsteady Reynolds-averaged Navier–Stokes equations as an initial boundary value prob...

Control of Corner Separation in a Linear Highly Loaded Compressor Cascade by Boundary Layer Suction

Corner separation (CS) which can lead to deleterious consequences is an inherent flow structure in compressor. Two new suction slot configurations (SSCs) were proposed to investigate effects of boundary layer suction (BLS) on CS in a linear highly loaded compressor cascade. Five SSCs, under the same suction mass flows of 0.7 % of the inlet mass flows, were numerically studied over a range of operation incidence angles. The results were compared for different SSCs. Then the flow details were systematically analyzed to reveal the flow mechanisms.