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Numerical investigation on drag and heat reduction mechanism of combined spike and rear opposing jet configuration

机译：尖刺与后置对置射流相结合的减阻机理的数值研究

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摘要

In order to reduce the hypersonic aerodynamic drag and heating, a combined spike and rear opposing jet configuration is proposed in this paper, and the CFD method is adopted to analyze the drag and heat reduction efficiency. The results show that the spike pushes the bow shock wave away from the blunt body, which translates the normal shock wave into the oblique shock wave and reduces the shock wave intensity. In addition, the low temperature jet gas is injected into the flow field, which reduces the temperature of the flow field after the shock wave. So the combined configuration reduces the aerodynamic drag and heating of the blunt body by the reconstruction of flow field, and the drag and heat reduction efficiency is better than the other configurations that already exist. The influences of the length of spike, total pressure of the opposing jet and jet gas on the drag and heat reduction efficiency are studied. The results show that increasing the length of the spike and the total pressure of the opposing jet can effectively improve the drag and heat reduction efficiency, and the decreasing rates of the aerodynamic drag and heating slow down gradually with the increase of above two parameters. In addition, the nitrogen has the best drag reduction efficiency and the carbon dioxide has the best heat reduction efficiency. The investigations in this paper verify the advantages and application in engineering of the combined configuration proposed in this paper.
机译：为了减少高超声速空气阻力和发热量，本文提出了组合的尖峰和后部相反的射流配置，并采用CFD方法分析了阻力和热效率。结果表明，尖峰将船首冲击波推离钝体，将正常冲击波转化为倾斜冲击波，降低了冲击波强度。另外，低温射流气体被注入到流场中，这降低了冲击波之后的流场的温度。因此，组合构造通过流场的重建减少了钝体的空气动力学阻力和热量，并且阻力和热量的降低效率优于已经存在的其他构造。研究了尖峰长度，对置射流和射流气体的总压力对阻力和减热效率的影响。结果表明，增加尖峰的长度和对置射流的总压力可以有效地提高阻力和减热效率，并且随着上述两个参数的增加，气动阻力和加热的减小速率逐渐减慢。另外，氮气具有最佳的减阻效率，而二氧化碳具有最佳的减热效率。本文的研究验证了本文提出的组合配置的优势及其在工程中的应用。

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  • 来源
    《Acta astronautica》 |2019年第2期|179-190|共12页
  • 作者

    Huang Jie; Yao Wei-Xing; Shan Xian-Yang;

  • 作者单位

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Peoples R China;

    Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Peoples R China|Nanjing Univ Aeronaut & Astronaut, Key Lab Fundamental Sci Natl Def Adv Design Techn, Nanjing 210016, Peoples R China;

    Hubei Aerosp Technol Acad, Syst Design Inst, Wuhan 430040, Hubei, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hypersonic; Drag and heat reduction; Combined configuration; Spike; Opposing jet;

    机译：高超音速;阻力和热量减少;组合配置;尖峰;对置射流;

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