流向涡与涡轮叶栅二次流相互作用研究

研究有效的流动控制手段,降低涡轮内部二次损失,对于小展弦比涡轮的气动设计具有重要意义。利用涡发生器在叶栅入口前产生流向涡,通过试验和数值方法探讨这种基于旋涡相互作用的流动控制方法对涡轮平面叶栅二次流动的作用效果,并对不同流向涡情况做对比分析。结果表明：流向涡对涡轮叶栅内部流动会产生较为显著的影响,从而影响叶栅的性能,当所产生流向涡强度和位置较为合理时,有可能通过流向涡与二次流的相互作用达到较大幅度降低二次流损失的目的。

Study of interactions between stream-wise vortex and secondary vortices in turbine cascade

Through effective flow control techniques to reduce secondary losses is specially important for the aerodynamic design of low aspect ratio turbine component.In this paper,numerical and experimental methods are employed to exploit the effectiveness of upstream stream-wise vortex on downstream turbine cascade secondary flow,where the stream-wise vortex are generated by vortex generators positioned in front of the linear cascade.A comparative analysis of different stream-wise vortex is carried out.The results indicate that the stream-wise vortex has a significant impact on the cascade flow field,therefore,on the performance of the cascade.It is possible to reduce the secondary losses significantly through the interactions between stream-wise vortex and secondary vortices on the condition that the intensity and location of stream-wise vortex are reasonably determined.