The interaction between the reattachment of laminar boundary layer and an open cavity(L/H=10) in a hypersonic compression ramp was investigated numerically and experimentally. Specifically, the present cavity is placed beneath the boundary layer reattachment in the hypersonic compression ramp. It was found that a high temperature separated shear layer collides with the back wall of cavity, where a hot stagnation point is formed. The maximum heat flux at the present cavity back wall is about 10 times as large as that of the baseline compression ramp without cavity (St=0.180). Even though the present cavity configuration is typical open cavity, the back wall area average heat flux is 2-3 times as large as that of the typical open cavity. The collision pattern between the shaer layer and the back wall is also quite different. The collision of the present cavity is intermittency, while the typical open cavity is continuous. Therefore we concluded that the present cavity placed beneath the boundary layer reattachment produces the quite different heat flux from the typical open cavity's one.

The interaction between laminar boundary layer reattachment and a rectangular cavity in a hypersonic compression ramp was investigated numerically and experimentally. It was found from the present results that the separation bubble becomes larger than that of the baseline flat ramp case. This is caused by higher adverse pressure gradient due to the cavity end wall. In the flowfield a high temperature separated shear layer collides with the endwall of cavity, where a hot stagnation point is formed. The endwall heat flux becomes about 10 times as large as the maximum heat flux in the baseline flat ramp case.

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