埋入式涡流发生器在亚音扩压器分离流控制中的应用

APPLICATION OF SUBMERGED VORTEX GENERATORS FOR SEPARATION CONTROL OF A SUBSONIC DIFFUSER

本文介绍了在一个大宽高比大扩压角二元亚音扩压器中采用适当几何参数的凹型面埋入式涡流发生器有效地控制扩压壁和角落区域分离流的试验结果。并分析了该型式涡流发生器主要几何参数对扩压器性能的影响。还对该型式涡流发生器与常规翼型式涡流发生器进行了比较。

The effects of the main geometrical parameters of the submerged vortex generators on the diffuser performance are analysed.A combination of corotating and counter rotating votex generators was used in the study.In the center part of the channel,four pairs of counter rotating vortex generators were used to eliminate the flow separation.At the two corners,two corotating vortex generator blades and one pair of counter roataing blades were used respectively to improve the three dimensional separation flow fields in these corner regions.The experimental results show that the static pressure recovery coefficient C P is enhanced remarkably and the total pressure loss is also reduced,if the geometrical parameters and the location of the vortex generators are selected properly.A comparative study between the submerged vortex generators of concave shape and the conventional vane type vortex generators is also presented.Both of them have almost the same efficiency for separation control,but the parasitic drag of the former is less due to its submergence in the boundary layer;and it is convenient for practical application because its distance to the separation starting point on the diverging wall of the generator is much shorter.