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。
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 sup⁃pression 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 ampli⁃tudes 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.
作者
郭晓东
周超英
万书翱
GUO Xiaodong;ZHOU Chaoying;WAN Shu’ao(School of Mechanical and Electrical Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2023年第16期85-100,共16页
Acta Aeronautica et Astronautica Sinica
基金
深圳市科技计划基础研究项目(JCYJ20170307151117299)。
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
hypersonic
rectangular pulsed jet
long penetration mode
unsteady simulation
drag and heat reduction
