Direct Numerical Simulation of Blowing in a Hypersonic Boundary Layer on a Flat Plate with Slots
Direct Numerical Simulation of Blowing in a Hypersonic Boundary Layer on a Flat Plate with Slots
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DOI：
10.2514/6.2018-3713
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Adriano Cerminara;R. Deiterding;N. Sandham
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文献类型：
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作者：
Adriano Cerminara;R. Deiterding;N. Sandham
通过直接数值模拟Navier-Stokes方程，分析了冷流体对马赫数为5的高超声速热边界层的吹扫。三种不同的配置被认为是，即i）一个域与模拟槽和增压室，ii）一个域与模拟槽，和iii）一个域与模拟吹在表面上。基于压力室压力的参数研究进行调查的总体流场结构和冷却性能的吹风比的增加的影响。用于模拟的数值方法包括6阶混合加权基本无振荡/中心差分（韦诺/CD）方案，以及自适应网格细化（AMR）方法，该方法能够精确解析增压室/槽区和边界层内的流动。二维（2D）模拟结果表明，压力室和模拟的压力室边界层流动和冷注入流体之间的混合层的结构，以及对冷却区域的长度下游的槽起着重要的作用。在最高的增压室压力下，所有配置的结果都表明在下游区域边界层发生高振幅振荡。包括槽和增压室的配置的三维（3D）模拟结果显示，槽区域下游的湍流过渡。转捩是由形成在喷射槽两侧的边缘涡的破裂引起的，并且转捩前缘向下游传播形成楔形结构。壁面冷却主要是在槽的侧面和尾流中实现的，但是一旦达到转变点，壁面温度就会显著增加。
Blowing of cold fluid into a hot Mach 5 hypersonic boundary layer over a flat plate with four equally-spaced slots is analyzed through direct numerical simulation of the Navier- Stokes equations. Three different configurations are considered, namely i) a domain with simulated slots and plenum chamber, ii) a domain with only simulated slots, and iii) a domain with modelled blowing on the surface. A parametric study based on the plenum pressure is performed to investigate the effect of an increasing blowing ratio on the general flowfield structure and cooling performance. The numerical method used for the simulations consists of a 6 th -order hybrid weighted-essentially-non oscillatory/central-differencing (WENO/CD) scheme, in conjunction with an adaptive-mesh-refinement (AMR) methodology which enables accurate resolution of the flow within the plenum/slots region and inside the boundary layer. Results of two-dimensional (2D) simulations show that the plenum pressure and the simulated plenum play an important role on the structure of the mixing layer between the boundary-layer flow and the cold injected fluid, as well as on the length of the cooled region downstream of the slots. At the highest plenum pressure, the results for all the configurations show occurrence of high-amplitude oscillations of the boundary layer in the downstream region. Results of the three-dimensional (3D) simulation for the configuration including both slots and plenum chamber show transition to turbulence downstream of the slot region. Transition is induced by the breakdown of the edge vortices forming at the sides of the injection slots, and the transition front propagates downstream forming a wedge-shaped structure. Wall cooling is shown to be mostly achieved at the sides and in the wake of the slots, but as soon as the transition point is reached the wall temperature increases significantly.