NUMERICAL SIMULATION OF HYPERSONIC FLOW OVER A SPHERE WITH SURFACE INJECTION
NUMERICAL SIMULATION OF HYPERSONIC FLOW OVER A SPHERE WITH SURFACE INJECTION
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表面注入球体高超声速流动的数值模拟
DOI：
10.2514/6.1998-773
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Keisuke Sawadar
中科院分区：
文献类型：
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作者：
E. Dendou;Keisuke Sawadar
为了研究表面喷射流对促进边界层湍流效应的影响，对钝体高超声速流动进行了数值模拟。在计算中，根据在适当的单方程湍流模型中实施的帕克喷射诱导湍流模型，假定喷射流是湍流的。将所得数值结果与边界层速度剖面的现有实验数据进行了比较。结果表明，即使上游是层流，引入表面喷射流时也会形成湍流边界层。在固体壁附近的速度剖面取得了合理的一致性，但在边界层中部存在较大差异。通过改变喷射率、多孔材料的时间常数和自由流涡粘性来努力提高一致性，但都没有得到完全令人满意的结果。湍流模型在计算具有有利压力梯度的边界层流动方面的无能被认为是可能的原因。
Numerical simulation of hypersonic flow over a blunt body is carried out for the purpose of examining the effect of surface injection flow in promoting turbulence effect in the boundary layer. In the calculation, injection flow is assumed to be turbulent according to the Park's injection-induced turbulence model which is implemented in an appropriate oneequation turbulence model. Obtained numerical results are compared with existing experimental data on the velocity profile in the boundary layer. It is shown that a turbulent boundary layer develops when surface injection flow is introduced, even for a laminar upstream flow. A reasonable agreement is obtained for velocity profile at the vicinity of solid wall, but a large discrepancy is seen in the middle of boundary layer. Efforts are made to improve the agreement by changing injection rate, time constant of porous material, and free stream eddy viscosity, but none gives a totally satisfactory agreement. Inability of the turbulence model in calculating a boundary layer flow with a favorable pressure gradient is suggested as the probable cause.