Flow Structures and Heating Augmentation Around Finite-Width Cavity in Hypersonic Flow
Flow Structures and Heating Augmentation Around Finite-Width Cavity in Hypersonic Flow
复制标题
DOI：
10.2514/1.j052647
复制
发表时间：
2014-07
期刊：
影响因子：
2.5
通讯作者：
Y. Ohmichi;Kojiro Suzuki
中科院分区：
文献类型：
--
作者：
Y. Ohmichi;Kojiro Suzuki
空腔对高超音速流中物体的加热有重要影响。先前的研究表明，边界层流动可以进入浅腔的内部并增加加热。在这项研究中，有限宽度的矩形空腔诱导的三维流动结构显示在可压缩的Navier-Stokes模拟。一个有限宽度的矩形空腔被发现鼓励下洗进入空腔，和一对反向旋转的纵向涡建立在空腔的尾迹区。下洗将高速边界层气流吸入空腔，并增加空腔底部的加热。高速流动冲击空腔端壁，引起局部峰值加热。缓慢消散的纵向涡产生，在尾流中产生长条纹的热区。由于进入空腔的高速气流量很小，深空腔或窄空腔引起的加热增强小于浅空腔和宽空腔。
Cavities significantly affect the heating of bodies in hypersonic flows. Previous studies have shown that boundary-layer flows can enter the interior of shallow cavities and augment heating. In this study, the three-dimensional flow structure induced by a finite-width rectangular cavity was revealed in compressible Navier–Stokes simulations. A finite-width rectangular cavity was found to encourage downwash into the cavity, and a pair of counter-rotating longitudinal vortices was established in the wake region of the cavity. The downwash draws high-speed boundary-layer flow into the cavity and augments the heating on the cavity floor. The high-speed flow impinges on the cavity endwall and causes local peak heating. Slowly dissipating longitudinal vortices are produced that generate long streaky hot regions in the wake. The heating augmentation induced by deep or narrow cavities is less than in shallow and wide cavities owing to the insignificant amount of high-speed flow entering the cavity.