STRUCTURE OF MIXING LAYER IN HIGH ENTHALPY HYPERSONIC FLOWS

高超声速湍流混合是高速气体动力学的基础研究课题，也是激波研究的重要应用。这项国际合作研究计划是在激波研究中心、流体科学研究所和多伦多大学航空航天研究所的密切合作下进行的，迄今取得的主要成果如下：（1）建立了一种在非结构网格下处理三维Navies-Stokes方程的有限差分格式，得到了高超声速湍流混合的数学模型。(2)为了在上述数值格式中包含化学反应项，详细研究了氢-氧反应的基元过程。(3)结合对高超声速湍流混合基本过程的认识，本文对激波及其后面的流动进行了实验研究。 ...更多信息 Y和数字。(4)本文研究了一个紧凑型自由活塞激波风洞及其喷管流场的特性：活塞在压缩管内的运动;喷管流场的起动过程;隔板位置对喷管流场的影响;喷管流场的Pitt压力分布;驱动气体污染。根据这些结果，发现马赫数为6的异形喷管的工作区域非常有限，因此设计了锥形喷管来代替它。(5)获得了14 MA/kg的滞止焓和6的喷管流动马赫数。本文将二次曝光全息干涉观测成功地应用于圆柱绕流的研究。(6)这些结果是在Jean Sislian教授从1995年至1997年财政年度总共8个月的逗留期间以及Jurgen Schumacher先生在1997年逗留6个月期间的密切合作下取得的。(7)迄今为止所取得的成果已提交给具有很高声誉的国际期刊发表。少

Topics on hypersonic turbulent mixing are not only basic research topics of high speed gas dynamics but also important applications of shock wave research. This international joint research program has been carried out for three years under close sollaborations between the Shock Wave Research Center Institute of fluid Science and the Institute of Aerospace Studies University Toronto.Results so far obtained are summarized as following :(1) A mathematical modelling of hypersonic turbulent mixing has been obtained by establishing a finite difference scheme which can handle three-dimentional Navies-Stokes equations in unstructured grid systems.(2) In order to include the chemical reaction terms in the above mentioned numerical scheme, detailed elementary processes of hedrogen-oxygen reactions has been investigated.(3) In conjunction with understanding of elementary processes of hypersonic turbulent mixsing, the motion of shock waves and flows behing them has been investigated experimentall … More y and numerically.(4) The characteristic of a compact free piston shock tunnel and its contoured nozzle flow has investigated : piton motion in compression tube ; starting process of nozzle fow ; effect of diaphragm location on the nozzle flows ; Pitt pressure profile of nozzle flow ; driver gas contamination. Based upon these results, it is found that the contoured Mach 6 nozzle has a very limited working region so that a conical nozzle is designed for its replacement.(5) The stagnation enthalpy of 14 MA/kg and nozzle flow Mach number of 6 has been obtained. Double exposure holographic interferometric observation has been successfully applied to the flow over a cylinder.(6) The results have been obtained under close collaboration during the stay of Professor Jean Sislian for total 8 months from the fiscal years 1995 to 1997 and also the stay of Mr.Jurgen Schumacher for 6 month in 1997.(7) The results so far obtained are submitted for the publication in international journals having high reputation. Less