扩压器流场畸变实验研究

THE EXPERIMENTAL INVESTIGATION ON THE DIFFUSER FLOW DISTORTION

研究收敛-扩张环形扩压器中,由于正激波与附面层相互作用产生的畸变流场,分析畸变产生的机理和影响因素,并探讨调节周向畸变指数的方法。中心体后段型面、扩张段壁面附面层分离和中心体尾流掺混对畸变指数有较大影响,但对面平均紊流度和总压恢复的影响不大。偏置中心体尾端,在一定范围内能调节周向畸变指数。

The distortion flow field produced by interacting between the normal shock and the boundary layer in the convergence-divergence diffuser is investigated in this paper. The effect of the geometrical parameters on the distortion factors is analysed and the regulation method of the circular distortion factor is discussed. The experiments show that the configuration of the centre body, boundary layer separation from the wall and the turbulence mix in the wake region of the centre body affect the distortion factor considerably and total pressure recovery and average turbulence slightly. The circular distortion factor can be regulated by turning the tail end of the centre body in certain extent.