Abstract The drag reduction characteristics play an important role in the supersonic vehicle design phase. According to two drag reduction schemes, the opposing jet and the upstream energy deposition have aroused the widespread interest of researchers. In the current study, the drag reduction effectiveness of a blunt body with the combination of the upstream energy deposition and the opposing jet configuration in supersonic flows is investigated numerically. The three-dimensional coupled implicit compressible Reynolds Averaged Navier-Stokes (RANS) equations coupled with the Menter's shear stress transport (SST) turbulence model are applied to numerically predict flow fields of the blunt body, the variance analysis method is introduced to a parametric study on the drag reduction. Results indicate that a larger overall drag is decreased by the combinational configuration than the single strategies of the opposing jet and the energy deposition. The proposal of the combination of the upstream energy deposition and the opposing jet configuration can be used as an effective method of drag reduction. Meanwhile, due to the existence of the upstream energy deposition, the stability and penetrability of the opposing jet substantially increase, especially for the long penetration mode. Further, some recommendations are provided for the drag reduction factor and drag reduction effectiveness.

中文翻译：

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超音速流中上游能量沉积与反向射流结构相结合的减阻参数研究

摘要 减阻特性在超音速飞行器设计阶段起着重要作用。根据两种减阻方案，反向射流和上游能量沉积引起了研究人员的广泛兴趣。在当前的研究中，通过数值研究了钝体与上游能量沉积和超音速流动中的反向射流配置相结合的减阻效果。将三维耦合隐式可压缩雷诺平均纳维-斯托克斯(RANS)方程与Menter的剪切应力传递(SST)湍流模型相结合，对钝体流场进行数值预测，将方差分析方法引入参数研究中关于减阻。结果表明，与相反射流和能量沉积的单一策略相比，组合配置降低了更大的整体阻力。上游能量沉积和反向射流配置相结合的提议可以作为一种有效的减阻方法。同时，由于上游能量沉积的存在，反向射流的稳定性和穿透性大大提高，尤其是长穿透模式。此外，还为减阻系数和减阻效果提供了一些建议。上游能量沉积和反向射流配置相结合的提议可以作为一种有效的减阻方法。同时，由于上游能量沉积的存在，反向射流的稳定性和穿透性大大提高，尤其是长穿透模式。此外，还为减阻系数和减阻效果提供了一些建议。上游能量沉积和反向射流配置相结合的提议可以作为一种有效的减阻方法。同时，由于上游能量沉积的存在，反向射流的稳定性和穿透性大大提高，尤其是长穿透模式。此外，还为减阻系数和减阻效果提供了一些建议。