科研之友
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摘要
The interaction between the shock wave with Mach number 2.9 and the turbulent boundary layer in the configuration of 24° compression-expansion corners is investigated by using direct numerical simulation. The influence of normal height of the expansion corner on the shock wave interaction region and downstream boundary layer is analyzed. It is found that when the height is large enough, the shock wave interaction region is not affected by the downstream expansion wave, and the characteristics are consistent with those of the traditional compression corner configuration. While the height is small, the reattachment process of the detached shear layer is accelerated by the downstream expansion wave, which causes the reattachment point to move upstream and the separation bubble to shrink dramatically. The decomposition of mean friction drag is applied to the turbulent boundary layer of the upstream and downstream plates, and the difference between the turbulent boundary layer in equilibrium and nonequilibrium state is explored. It is found that the high friction in the expansion corner is mainly related to the Cf1 term and Cf3 term in the decomposition of mean friction drag. The height has little effect on the Cf1 term, while significant effect on the Cf2 term. Height variation is reflected in the contribution of the G?rtler vortex and re-laminar phenomenon on the downstream plate to the Cf2 term.
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单位高温气体动力学国家重点实验室; 中国科学院大学
