航空学报 > 2023, Vol. 44 Issue (16): 127967-127967   doi: 10.7527/S1000-6893.2022.27967

矩形脉冲射流对长穿透模态减阻降热的影响

郭晓东, 周超英(), 万书翱   

  1. 哈尔滨工业大学(深圳)机电工程与自动化学院,深圳  518055
  • 收稿日期:2022-09-05 修回日期:2022-09-23 接受日期:2022-11-16 出版日期:2023-08-25 发布日期:2022-12-14
  • 通讯作者: 周超英 E-mail:cyzhou@hit.edu.cn
  • 基金资助:
    深圳市科技计划基础研究项目(JCYJ20170307151117299)

Effects of rectangular pulsed jets on drag and heat reduction of long penetration mode

Xiaodong GUO, Chaoying ZHOU(), Shu’ao WAN   

  1. School of Mechanical and Electrical Engineering,Harbin Institute of Technology (Shenzhen),Shenzhen  518055,China
  • Received:2022-09-05 Revised:2022-09-23 Accepted:2022-11-16 Online:2023-08-25 Published:2022-12-14
  • Contact: Chaoying ZHOU E-mail:cyzhou@hit.edu.cn
  • Supported by:
    Shenzhen Science and Technology Plan Basic Research Project(JCYJ20170307151117299)

摘要:

逆向喷流作为一种主动减阻降热技术,受到了广泛的关注,但逆向喷流长穿透模态下的弓形激波会出现大幅振荡,流场出现极不稳定的现象。以高超声速流动中的球头体为研究对象,研究矩形脉冲射流对长模态流动不稳定性的可能抑制或缓解作用。研究发现,与稳态射流形成的长穿透模态相比,不同频率和振幅的矩形脉冲射流对长模态均有明显的降热效果。此外,长模态阻力系数的最小值所对应的瞬时激波脱体距离并不是最大值,两者有一定的相位差。相对于稳态射流形成的长模态激波脱体距离的大幅度振荡,矩形脉冲射流对长模态振荡有明显的抑制作用。本文研究结果对高超声速矩形脉冲射流技术的工程应用和发展具有一定的参考意义。

关键词: 高超声速, 矩形脉冲射流, 长穿透模态, 非定常模拟, 减阻降热

Abstract:

As an active drag and heat reduction technology, the counterflowing jet has received extensive attention. However, the bow shock in the long penetration mode of counterflowing jet will oscillate significantly, and the flow field will be extremely unstable. Taking the hemispherical body in hypersonic flow as the research object, the possible suppression or mitigation effect of rectangular pulse jet on long mode flow instability is studied. It is found that compared with the steady jet forming the long penetration mode, the rectangular pulsed jet with different frequencies and amplitudes has an obvious heat reduction effect on the long penetration mode. In addition, while the drag coefficient of the long penetration mode takes the minimum value, the corresponding instantaneous standoff distance does not reach the maximum value, with a certain phase difference between them. The large oscillation of the long penetration mode shock standoff distance formed by the steady jet is clearly suppressed by the rectangular pulsed jet. The research results provide reference for the application and development of the hypersonic rectangular pulsed jet technology.

Key words: hypersonic, rectangular pulsed jet, long penetration mode, unsteady simulation, drag and heat reduction

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