三维楔体诱导高超声速层流分离油流显示实验研究

在高超声速风洞中采用油流显示技术开展了三维楔体诱导层流分离现象的实验研究。研究模型为矩形平板/三维楔体、三角形平板/三维楔体。研究结果表明:高超声速（马赫数6.0）局部层流分离结构不仅受楔体压缩角影响，受前体外形的影响也很明显；对于三角形前体，由于楔体上游来流存在横向流动，使得楔体诱导的分离流动结构完全不同于矩形平板模型，且在不同迎角下，分离线形状也存在较大差异；受三角形前体与三维楔体综合作用，诱导层流分离呈现非常显著的三维效应。

Experimental study on structural characteristics of separation flow induced by 3D wedge in hypersonic laminar flow by oil visualization

Experimental investigation of hypersonic laminar separation flow over a 3D wedge is carried out in the hypersonic wind tunnel by utilizing oil flow visualization technique. Two test models of rectangular/ triangular flat plate are used. The 3D wedges which have different compression angles are mounted on the afterbody of models. The experimental result shows that the forebody shape has a great influence on the structures of hypersonic laminar separation induced by the 3D wedge. For the triangular plate model, the flow in the upstream of the wedge has obvious crossflow effect, and the separation structure is completely different from that of the rectangular plate model. At different attack angles, the shapes of the separation lines are also very different. The result shows very significant 3D effect of the local laminar separation which is induced by the triangular forebody and the 3D wedge.