本文对由平板上直立尖劈产生的激波/湍流边界层干扰引起的起始分离进行了研究,提出了一种预测起始分离条件的方法。边界层内的分析采用了Johnston的三角形模型,边界层外主流分析则利用了Prandtl-Meyer函数。预测方法的结果表明与文献中的实验数据符合良好,而且比McCabe理论和Korkegi准则及Lu的半经验关系有更好的物理基础。 In this paper, the initial separation caused by shock / turbulent boundary layer interference caused by the upright wedge on the slab is studied. A method to predict the initial separation condition is proposed. The analysis within the boundary layer uses the Johnston triangle model, and the mainstream analysis outside the boundary layer utilizes the Prandtl-Meyer function. The results of the prediction method show good agreement with the experimental data in the literature and a better physical basis than the semi-empirical relationship between McCabe’s theory and Korkegi’s criterion and Lu.