ACTA AERONAUTICAET ASTRONAUTICA SINICA >
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)
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.
Xiaodong GUO , Chaoying ZHOU , Shu’ao WAN . Effects of rectangular pulsed jets on drag and heat reduction of long penetration mode[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(16) : 127967 -127967 . DOI: 10.7527/S1000-6893.2022.27967
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