Experimental study of interaction between supersonic duct flow and jets surrounded by the porous cavity
Experimental study of interaction between supersonic duct flow and jets surrounded by the porous cavity
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DOI：
10.1016/j.expthermflusci.2012.03.011
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发表时间：
2012-07
影响因子：
3.2
通讯作者：
N. Kuniyoshi;M. Yaga;A. Koda;I. Teruya;M. Ishikawa
中科院分区：
文献类型：
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作者：
N. Kuniyoshi;M. Yaga;A. Koda;I. Teruya;M. Ishikawa
在实验中，采用纹影显示技术，利用本文介绍的热簇探针测量了多孔空腔内的壁面静压和流动方向，研究了射流与多孔空腔的组合对流场的影响。这些测量是同时进行的，这使我们能够评估射流和多孔腔的影响。在本实验中测试了三种情况下的射流布置。即（1）仅以多孔壁作为参考的无射流，（2）多孔区域中部的单射流，（3）多孔区域中的三个射流沿展向与主流对齐。结果表明，根据激波位置和壁面静压测量结果，空腔内的热簇探针对整个流场是一种无扰动的检测装置。研究还发现，起动激波和射流布置方式对空腔内的流动方向有很大影响。对于所有射流模式以及无射流情况，只要起始激波位于多孔壁的上游区域，则空腔中测量位置处的流动方向总是与主流相反。此外，当起始激波存在于多孔壁区下游，即多孔壁区主流状态为超声速时，对于在多孔壁中部发出的单股射流，空腔内的流动方向仍与主流方向相反。研究结果表明，射流与多孔空腔的组合影响了空腔内激波的位置和流动方向，是一种很有前途的流场控制技术。
In the experiments, the effect of the combination of jets and a porous cavity on the flow field is studied by means of visualization of schlieren method and the measurements of wall static pressures and the flow direction in the cavity with the thermal tuft probe which is introduced in this paper. These measurements are performed simultaneously, which allow us to evaluate the effect of the jets and the porous cavity. Three cases for the jet arrangements are tested in this experiments. That is (1) no-jets issued only with a porous wall as a reference, (2) a single jet at the middle of the porous region, and (3) three jets in the porous region aligned spanwise to the main flow. As a result, the thermal tuft probe in the cavity is found to be non-disturbing detecting device to the whole flow field according to the shock locations and the wall static pressure measurements. It is also found that the flow direction in the cavity is greatly influenced by the starting shock wave and jet arrangements. The flow direction at the measurement positions in the cavity is always opposite to the main flow, as long as the starting shock wave is located upstream region of the porous wall for all jet patterns as well as the no-jets case. Moreover, in case that the starting shock wave exists downstream of the porous region, that is, the state of the main flow in the porous wall region is supersonic state, the flow direction in the cavity continues to be opposite to the main flow for a single jet issued at the middle of the porous wall. The results in this paper show that the combination of the jets and the porous cavity affects the shock positions and the flow direction in the cavity, which could be one of the promising techniques for the control of the flow field.