矩形脉冲射流对长穿透模态减阻降热的影响
收稿日期: 2022-09-05
修回日期: 2022-09-23
录用日期: 2022-11-16
网络出版日期: 2022-12-14
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
Received date: 2022-09-05
Revised date: 2022-09-23
Accepted date: 2022-11-16
Online published: 2022-12-14
Supported by
Shenzhen Science and Technology Plan Basic Research Project(JCYJ20170307151117299)
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。
郭晓东 , 周超英 , 万书翱 . 矩形脉冲射流对长穿透模态减阻降热的影响[J]. 航空学报, 2023 , 44(16) : 127967 -127967 . DOI: 10.7527/S1000-6893.2022.27967
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.
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