超声速转弯流道内的迟滞现象

摘要

With the centerline Mach-number distributions provided in advance,a two-dimensional supersonic wave-cancelled channel was designed by the Method of Characteristics.The shock train,wall static pressure distributions and separation region were investigated.The relationship between the shock train and back pressure was also investigated.The flow-field had dual solutions when the head of the shock train was in the vicinity of the channel inflection.When the flow evolved into the single-solution domain from the dual-solution domain,the larger separated zone transferred quickly and the shock-train structure evolved fast.%采用特征线法，通过预先给定中心线马赫数分布，设计了消波的二维超声速转弯流道。研究了不同反压作用下转弯流道内的激波串结构、壁面沿程静压分布和壁面分离区演化等特征，分析了流道内激波串波结构与反压的关系，发现了激波串波头很难稳定在流道拐点附近。当激波串波头靠近流道拐点时，流场具有双解。流动双解区向单解区演化过程中，伴随有大分离区在上、下壁面之间的迅速转换和激波串结构的快速演化。