一、前言 高超声速流的分离再附问题,尤其是湍流边界层分离,引起了国内外气动研究工作者的广泛兴趣。为了解湍流分离再附区的基本流动机理和建立半经验的估算方法,国外在简单的平板-楔二维模型上进行了大量的实验研究,积累了很多实验资料,建立了一些经验关系式。但这些实验大都在楔角小于45度的模型上进行的。内斯特勒等人虽对平板-前向台阶模型测量了台阶前分离区的热流分布,但台阶面上只测得两三个位置的热 I. INTRODUCTION The problem of separation and re-attachment of hypersonic flow, especially turbulent boundary layer separation, has aroused widespread interest of aerodynamic research workers at home and abroad. In order to understand the basic flow mechanism of turbulent separation reattachment zone and to establish a semi-empirical estimation method, a large number of experimental studies have been carried out on a simple flat-wedge two-dimensional model abroad. Many experimental data have been accumulated and some empirical relationships have been established. However, most of these experiments were performed on wedge angles less than 45 degrees. Nestor and others measured the heat flux profile of the separation zone before the step on the plate-forward step model, but only two or three positions of heat were measured on the step surface