连续双扫掠激波/湍流边界层干扰流动特性研究

Investigation on Flow Characteristics of Successive Bi-Swept Shock Waves/Turbulent Boundary Layer Interaction

关键词:  激波  湍流  边界层干扰  流动特性  主旋涡

Key words:  Shock waves  Turbulent  Boundary layer interaction  Flow characteristics  Main vortex

摘要:

为了探究连续双扫掠激波/湍流边界层干扰的流动特性，采用仿真方法对一双尖鳍/平板物理模型进行研究。结果表明:双扫掠激波/湍流边界层干扰形成的两个干扰区存在明显的相干现象，虽然第一道扫掠激波/边界层干扰流动仍具有典型的准锥形相似特性，但受其干扰所形成的非均匀流的影响，第二道扫掠激波/边界层干扰却不再具有准锥形相似特性，同时第二个干扰区将影响其上游临近气流的运动甚至影响第一个干扰区的再附线和分离线等结构。两个干扰区形成各自的λ波结构，并且沿着流向两个干扰区内的激波结构相互汇聚，最终合并为单个更强的λ波结构；不仅如此，两个干扰区内还形成了复杂的旋涡结构，包括一级主旋涡和二级主旋涡，这些旋涡向下游运动，最终融合成一个尺度更大的锥形主旋涡。

Abstract:

In order to explore the flow characteristics of successive bi-swept shock waves/turbulent boundary layer interaction， numerical simulation is applied to study a double-fins/plate physical model. The results show that the two interaction regions of the bi-swept shocks/boundary layer interaction flow interfere with each other. Though the interaction region formed by the first swept shock maintains its quasi-conical similarity nature， due to the non-uniform flow downstream of the first shock， the quasi-conical similarity nature is no longer applicable to the second swept shock/boundary layer interaction. In addition， the second interaction region will affect the adjacent upstream flow and it even alters the behavior of the reattachment line and separation line induced by the first shock. Two λ-shaped shocks emerge in the two interaction regions， and these shocks converge along streamwise direction， and eventually merge into a stronger single λ-shaped shock. Furthermore， complex vortical structures are generated in the two interaction regions， including the first main vortex， the second main vortex. The two vortices move downstream and coalesce to a larger conical main vortex.