熵层对高超声速二维钝楔气动参数的影响

采用薄激波层理论和流管质量守恒相结合的方法,分析了高超声速二维钝楔边界层外缘熵的分布规律,研究了熵层对边界层外缘密度、马赫数以及壁面气动加热等气动参数的影响.结果表明:边界层外缘熵在倒圆-肩部区下降最为剧烈,熵层对气动参数的影响在高超声速下不可忽略,特别是使转捩区和湍流区的气动加热增加约53.6%.因此,将表面流态控制在层流模式对高超声速飞行器热防护具有重要意义.

Influence of entropy layer on aerodynamics parameters for hypersonic 2-D blunt wedge

Using thin shock layer theory and mass conservation of stream tube,the entropy distribution of boundary layer exterior margin was analyzed for hypersonic two-dimensional(2-D) blunt wedge,and the influence of entropy layer on aerodynamics parameters such as density,Mach number,and aeroheating,et al.,was investigated.The results show that the entropy of boundary layer exterior margin dropped more quickly in rounding-shoulder region,and the influence of entropy layer on aerodynamics parameters should not be neglectable,which especially augmented the aeroheating 53.6% in transition and turbulent region.So,controling the flow of wall to stay in laminar model is very important for thermal protection of hypersonic vehicle.