Cite this Article
Liu Qiang, Luo Zhenbing, Deng Xiong, Liu Zhiyong, Wang Lin, Zhou Yan. Supersonic boundary layer transition induced by self-sustaining dual jets. Chinese Physics B, 2020, 29(1): 014704  
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Supersonic boundary layer transition induced by self-sustaining dual jets
Liu Qiang1, Luo Zhenbing1, †, Deng Xiong1, ‡, Liu Zhiyong1, 2, Wang Lin1, Zhou Yan1
College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
China Aerodynamic Research and Development Center, Mianyang 621000, China

 

† Corresponding author. E-mail: luozhenbing@163.com badi_arg@126.com

Project supported by the National Natural Science Foundation of China (Grant Nos. 11602299, 11872374, and 51809271).

Abstract

To promote high-speed boundary layer transition, this paper proposes an active self-sustaining dual jets (SDJ) actuator utilizing the energy of supersonic mainflow. Employing the nanoparticle-based planar laser scattering (NPLS), supersonic flat-plate boundary layer transition induced by SDJ is experimentally investigated in an Ma-2.95 low-turbulence wind tunnel. Streamwise and spanwise NPLS images are obtained to analyze fine flow structures of the whole transition process. The results reveal the transition control mechanisms that on the one hand, the jet-induced shear layer produces unstable Kelvin–Helmholtz instabilities in the wake flow, on the other hand, the jets also generates an adverse pressure gradient in the boundary layer and induce unstable streak structures, which gradually break down into turbulence downstream. The paper provides a new method for transition control of high-speed boundary layer, and have prospect both in theory and engineering application.

PACS: 47.85.ld;47.40.Ki;47.80.Jk;47.27.De
Keyword:supersonic boundary layer transition;self-sustaining dual jets;nanoparticle-based planar laser scattering (NPLS);vortex structures
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