超声速来流下叶片式微型涡流发生器流动控制研究

不同构型的微型涡流发生器对提高进气道/隔离段性能所产生的效果不同.采用数值模拟方法研究来流马赫数为2.0条件下,五种叶片式微型涡流发生器对流场边界层的流动控制特性.结果表明:带有一定前缘高度的叶片式微型涡流发生器可产生更强的流向涡,总压畸变和马赫数畸变较小,流场出流质量更佳,但同时带来较大的总压损失;微型涡流发生器的前缘厚度对流场性能提升无明显帮助,反而会增大总压损失;无前缘高度的微型涡流发生器能在引入较小总压损失的情况下,使隔离段拥有较强的抗反压能力,同时有效增大壁面摩擦系数,提高边界层对抗分离的能力.

Investigation on Flow Control of Supersonic Flow PastVane type Micro-Vortex Generator

The supersonic flow (Ma=2.0) past vane types of micro-ramps have been simulated to improve the characteristics of isolator. The findings of the study are as follows, MVG with high frontage generated stronger streamwise vortex, the total pressure distortion and Ma number distortion decreased but brought higher total pressure loss. The wide frontage of MVG not only has no use to improve flow control characteristics, instead of causing more total pressure loss. Flow filed controlled by MVG which has no wide frontage and high frontage could suffer higher back pressure and increase skin fraction coefficient may correspond to delayed separation and a smaller interaction region.