Experimental Investigation of Hypersonic Laminar Flow Over a Compression Ramp
Experimental Investigation of Hypersonic Laminar Flow Over a Compression Ramp
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压缩坡道上高超声速层流的实验研究
DOI：
10.1115/1.4051858
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发表时间：
2021-08
影响因子：
2
通讯作者：
Zhouping Yin
中科院分区：
文献类型：
--
作者：
Jin Lu;Hua Yang;Zhang Qinghu;Xin Wen;Zhouping Yin
在马赫数为5的高超声速风洞中，对32 °、36 °和40 °压缩斜面上的高超声速层流边界层流动分离进行了实验研究。利用粒子图像测速技术（PIV）对流场进行了详细的结构测量，清晰地捕捉到了剪切层、分离激波、回流区和再附着激波等典型的流动结构。在32 °压缩斜面流动中，高超声速层流不发生流动分离，边界层始终附着在斜面上。当斜板角增大到36 °时，高超声速层流中出现典型的流动分离，流场中出现剪切层和再附激波。当斜板角增加到40 °时，分离激波向上游移动，再附激波向下游移动，回流区扩大。本征正交分解（POD）分析的速度轮廓上的三种情况下，揭示了流场的空间结构。随着斜板角度的增大，POD模态的数量减少，相干结构的捕获率提高，大角度压缩斜板流场中相干结构的数量增多。最后，对三种不同压缩比下的流动分离进行了数值模拟，模拟结果与测量结果基本一致。
Abstract An experimental investigation on the flow separation of a hypersonic laminar boundary layer flow over a compression ramp with angles of 32 deg, 36 deg, and 40 deg is carried out in a Mach 5 hypersonic wind tunnel. The detailed structures are measured by particle image velocimetry (PIV), and some typical flow structures, such as a shear layer, separation shock, recirculation zone and reattachment shock, are clearly captured. In the 32 deg compression ramp flow, the hypersonic laminar flow does not experience flow separation, and the boundary layer always attaches to the ramp surface. When the ramp angle increases to 36 deg, a typical flow separation appears in the hypersonic laminar flow, and a shear layer and reattachment shock arise within the flow field. As the ramp angle increases to 40 deg, the separation shock moves upstream, the reattachment shock moves downstream, and the recirculation zone expands. Proper orthogonal decomposition (POD) analysis is performed on the velocity contours for three cases, revealing the spatial structure of the flow field. As the ramp angle increases, the coherent flow structures are captured more effectively by less POD modes, and there are more coherent structures in the flow field of a large-angle compression ramp. Finally, numerical investigations of the flow separation on three different compression ramps are carried out, and the simulation results are consistent with the measurement results.
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