双喷气自循环机匣处理对对转压气机性能的影响

Effects of Dual-Jet Self-Recirculating Casing Treatment on Performance of a Counter-Rotating Axial-Flow Compressor

关键词:  对转压气机，双喷气自循环机匣处理  转速比  失速裕度  数值模拟

Key words:  Counter-rotating axial-flow compressor  Dual-jet self-recirculating casing treatment  Speed ratio  Stall margin  Numerical simulation

摘要:

为发展适用于对转压气机变转速比工况下的扩稳技术，基于某两级对转压气机设计出一种新型双喷气自循环机匣处理结构，能够实现在不同转速比下提高对转压气机的失速裕度。在设计转速比下研究了轴向喷气位置对自循环机匣处理扩稳能力的影响，并选取扩稳性能最佳的双喷气自循环机匣处理方案探究其在变转速比工况下的扩稳潜力。研究结果表明，在设计转速下，双喷气自循环机匣处理主要改善后排转子的叶顶流场，失速裕度最大提高8.40%；在非设计转速比下，双喷气自循环机匣处理可将失速裕度提升8.71%~9.74%。双喷气自循环机匣处理的双射流将叶顶泄漏流和主流的交界面推向下游，同时改善了两转子的叶顶流场品质，从而推迟失速的发生。

Abstract:

To develop the stabilization technology suitable for the variable speed ratio conditions of the counter-rotating axial-flow compressor （CRAC）， a novel dual-jet self-recirculating casing treatment （SRCT） is designed based on a two-stage CRAC， which can improve the stall margin of the CRAC under different speed ratio conditions. The effects of the axial injection position on the SRCT stabilization capacity are studied at the design speed ratio condition， and the dual-jet SRCT scheme with the best stabilization performance is selected to verify its stability expansion potential under variable speed ratio conditions. Results show that the dual-jet SRCT mainly improves the tip flow of the rear rotor at the design speed ratio condition， and the maximum stall margin increases by about 8.40%. Under off-design speed ratio conditions， the dual-jet SRCT enhances the stall margin by about 8.71%~9.74%. The interface between the tip leakage flow and the main flow is pushed to the downstream by the dual-jet the SRCT， and the tip flow of both rotors is improved simultaneously， thus further delaying the occurrence of the stall.