关键词: 扩压器;流场畸变;研究

Abstract: 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.

Key words: Diffuser;Flow distortion;Research