Title: Effects of endwall slot jet angles on the performance of high-load compressor cascade

Authors: Junfu Yuan; Chen Li

Addresses: Marine Electrical and Intelligent Engineering College, Jiangsu Maritime Institute, Nanjing, 211170, China; Jiangsu Ship Energy-Saving Engineering Technology Center, Nanjing, 211170, China ' Marine Electrical and Intelligent Engineering College, Jiangsu Maritime Institute, Nanjing, 211170, China; Jiangsu Ship Energy-Saving Engineering Technology Center, Nanjing, 211170, China

Abstract: The three-dimensional corner separation represents a major obstacle to enhance performance of a high-load compressor cascade. To tackle this challenge, we conducted a computational fluid dynamics (CFD) numerical simulation to investigate impact of the endwall slit jet parameters on performance of the compressor cascade. Through numerical analysis, we found that the endwall slot jets substantially suppressed the corner separation and reduced flow loss. At a jet flow rate comprising a mere 0.435% of the mainstream flow rate, a 30° combined jet angle can cause a drop of 27.63% in losses and an increase of 9.2% in the static pressure coefficient. The primary mechanism behind the effectiveness of endwall slot jets lies in their ability to reduce flow losses and improve cascade performance. This is achieved by suppressing secondary flow in the endwall region, facilitating the mixing of low-energy fluid with the mainstream, proficiently regulating the development of passage vortices and inducing vortices.

Keywords: high load diffuser cascades; end wall slit jet; jet flow rate; combined jet angle; flow control; angular separation; cascade performance.

DOI: 10.1504/IJVSMT.2026.153199

International Journal of Vehicle Systems Modelling and Testing, 2026 Vol.20 No.2, pp.115 - 132

Received: 06 Nov 2024
Accepted: 16 Feb 2025
Published online: 29 Apr 2026 *

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