A PIV STUDY OF OVEREXPANDED SUPERSONIC IMPINGING FREE JET AT MACH 1.754
Results of a Particle Image Velocimetry (PIV) experimental study about the flow properties of an overexpanded axisymmetric supersonic jet issuing from a Mach 1.754 C-D nozzle and impinging on a ground plane is described in this paper. The ground plane is 2.5D separated from the nozzle exit section. The PIV measurements demonstrate that the stagnation bubble is formed due to the impingement of the slip line shear layer that also establishes the presence of recirculating flow in the stagnation bubble, which is clearly shown in this paper. The radial wall jet was found to be in high-speed, which is important to the ground erosion problem. The comparison of instantaneous and mean PIV measurements confirms the essential unsteady behavior of the impinging jet. The shock wave structure and the unsteady entrainment vortex of nozzle jet and wall jet are clearly demonstrated by PIV data, which is helpful to understand the overexpanded axisymmetric supersonic jet impingement.
PIV measurement overexpanded supersonic impinging jet shock wave shear layer stagnation bubble recirculation vortex
Chunfeng Lin Jinglei Xu Jiang Sha Kunyuan Zhang
Department of Power EngineeringNanjing University of Aeronautics and Astronautics Jiang Su Province, 210016, P.R.China
国际会议
昆明
英文
601-608
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）