Abstract A novel combinational configuration is proposed for drag and heat reduction in this paper, the CFD numerical method is adopted to study its drag and heat reduction performance. The results show that the aerodisk enhances the compression of hypersonic free stream by the spike to reduce the intensity of reattachment shock wave. The rear jet pushes the reattachment shock wave away from the blunt body and reduce the intensity of reattachment shock wave as well. In addition, the low-temperature gas from rear jet can also cool the blunt body directly. Increasing the length-diameter ratio of the spike reduces the intensity of reattachment shock wave, the rear jet gas can be ejected farther to push the reattachment shock wave father away from the blunt body. Increasing the diameter of aerodisk enhances the compression of hypersonic free stream to reduce the intensity of reattachment shock wave, while the shock wave drag of spike gradually increases. Therefore, with the increase of diameter of aerodisk, the total drag coefficient of combinational configuration first decreases and then increases. The rear jet presents the long penetration mode and short penetration mode. Increasing the total pressure ratio and the size of nozzle can push the reattachment shock wave away from the blunt body and reduce the intensity of reattachment shock wave, more low-temperature gas can also be injected into the flow field to cool the blunt body effectively. Finally, the flat disk has better drag and heat reduction performance than conical disk and hemispherical disk.

中文翻译：

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高超声速流动中新型组合尖刺钝体和后方对流射流概念的减阻和减热参数研究

摘要 本文提出了一种新的减阻减热组合结构，采用CFD数值方法研究其减阻减热性能。结果表明，航盘增强了尖峰对高超声速自由流的压缩，从而降低了再附着激波的强度。后射流将重附激波推离钝体，同时降低重附激波的强度。此外，来自后部喷射的低温气体也可以直接冷却钝体。增大尖刺的长径比降低了再附着激波的强度，后部喷射气体可以喷射得更远，将再附着激波父推离钝体。增大航盘直径，增强了高超声速自由流的压缩，降低了重附激波的强度，同时尖峰的激波阻力逐渐增大。因此，随着航盘直径的增加，组合配置的总阻力系数先减小后增大。后射流呈现长穿透模式和短穿透模式。增大总压比和喷嘴尺寸可以将再附激波推离钝体，降低再附激波的强度，还可以将更多的低温气体注入流场，有效地冷却钝体。最后，扁平盘比锥形盘和半球盘具有更好的减阻和减热性能。而尖峰的冲击波阻力逐渐增大。因此，随着航盘直径的增加，组合配置的总阻力系数先减小后增大。后射流呈现长穿透模式和短穿透模式。增大总压比和喷嘴尺寸可以将再附激波推离钝体，降低再附激波的强度，还可以将更多的低温气体注入流场，有效地冷却钝体。最后，扁平盘比锥形盘和半球盘具有更好的减阻和减热性能。而尖峰的冲击波阻力逐渐增大。因此，随着航盘直径的增加，组合配置的总阻力系数先减小后增大。后射流呈现长穿透模式和短穿透模式。增大总压比和喷嘴尺寸可以将再附激波推离钝体，降低再附激波的强度，还可以将更多的低温气体注入流场，有效地冷却钝体。最后，扁平盘比锥形盘和半球盘具有更好的减阻和减热性能。组合构型的总阻力系数先减小后增大。后射流呈现长穿透模式和短穿透模式。增大总压比和喷嘴尺寸可以将再附激波推离钝体，降低再附激波的强度，还可以将更多的低温气体注入流场，有效地冷却钝体。最后，扁平盘比锥形盘和半球盘具有更好的减阻和减热性能。组合构型的总阻力系数先减小后增大。后射流呈现长穿透模式和短穿透模式。增大总压比和喷嘴尺寸可以将再附激波推离钝体，降低再附激波的强度，还可以将更多的低温气体注入流场，有效地冷却钝体。最后，扁平盘比锥形盘和半球盘具有更好的减阻和减热性能。还可以将更多的低温气体注入流场，有效地冷却钝体。最后，扁平盘比锥形盘和半球盘具有更好的减阻和减热性能。还可以将更多的低温气体注入流场，有效地冷却钝体。最后，扁平盘比锥形盘和半球盘具有更好的减阻和减热性能。