Abstract

The shear mixing and streamline vortices are the notable parameters to influence the air–fuel mixing in hypersonic flows. The shock wave development and Mach number significantly influence the shear mixing phenomenon. Hence, this research introduced an unconventional strut and tested its performance for the generation of shock waves at different flow conditions (M = 2,4,6). The Reynolds-averaged Navier–Stokes equations are solved to evaluate the performance of the new strut. Both the DLR scramjet strut injector and wavy wall strut injector are assessed for the shear mixing development. Turbulence for the association of shock waves, mixing layer, and the boundary layer has been modeled with the SST k-ω model. The variation in shock development and its interactions are investigated further with an increase in Mach number. The scramjet flow structure differentiation found the increased number of oblique shock waves with the wavy wall strut fuel injector. It increases the turbulence level with increased streamline vortices, turbulent intensity, and turbulent kinetic energy. The shock wave generation analysis at different Mach numbers (M = 2,4,6) found fewer interactions between the shock wave and shear layer with increased Mach number. From the examination of shock wave generation and its interaction with the shear layer and analysis of turbulent parameters, it is found that the wavy wall strut has an appreciable effect on shock-induced blend augmentation of fuel and air.

中文翻译：

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波浪式壁撑式喷油器对超燃冲压燃烧器的冲击波发展和燃料与空气混合增强的影响

摘要

剪切混合和流线涡旋是影响高超声速流动中空气-燃料混合的重要参数。冲击波的发展和马赫数显着影响剪切混合现象。因此，这项研究引入了一种非常规支柱，并测试了其在不同流动条件下（M = 2,4,6）产生冲击波的性能。解决了雷诺平均Navier-Stokes方程，以评估新支杆的性能。评估了DLR超燃喷射支撑杆喷射器和波浪壁支撑杆喷射器的剪切混合发展情况。用SSTk-ω模型对冲击波，混合层和边界层之间的湍流进行了建模。随着马赫数的增加，进一步研究了冲击发展及其相互作用的变化。超燃冲压发动机的流动结构差异发现，波浪形壁撑杆喷油器增加了斜向冲击波的数量。随着流线涡旋，湍流强度和湍动能的增加，湍流水平增加。在不同马赫数（M = 2,4,6）下的冲击波产生分析发现，随着马赫数的增加，冲击波与剪切层之间的相互作用变少了。通过检查冲击波的产生及其与剪切层的相互作用以及湍流参数的分析，发现波浪形的壁撑对冲击引起的燃料和空气的混合增加具有显着的影响。和湍动能。不同马赫数（M = 2,4,6）的激波产生分析发现，随着马赫数的增加，激波与剪切层之间的相互作用变少了。通过检查冲击波的产生及其与剪切层的相互作用以及湍流参数的分析，发现波浪形的壁撑对冲击引起的燃料和空气的混合增加具有显着的影响。和湍动能。不同马赫数（M = 2,4,6）的激波产生分析发现，随着马赫数的增加，激波与剪切层之间的相互作用变少了。通过检查冲击波的产生及其与剪切层的相互作用以及湍流参数的分析，发现波浪形的壁撑对冲击引起的燃料和空气的混合增加具有显着的影响。