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Chin. Phys. B, 2020, Vol. 29(1): 014704    DOI: 10.1088/1674-1056/ab5ef7
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Supersonic boundary layer transition induced by self-sustaining dual jets

Qiang Liu(刘强)1, Zhenbing Luo(罗振兵)1, Xiong Deng(邓雄)1, Zhiyong Liu(刘志勇)1,2, Lin Wang(王林)1, Yan Zhou(周岩)1
1 College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;
2 China Aerodynamic Research and Development Center, Mianyang 621000, China
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.
Keywords:  supersonic boundary layer transition      self-sustaining dual jets      nanoparticle-based planar laser scattering (NPLS)      vortex structures  
Received:  23 June 2019      Revised:  16 October 2019      Published:  05 January 2020
PACS:  47.85.ld (Boundary layer control)  
  47.40.Ki (Supersonic and hypersonic flows)  
  47.80.Jk (Flow visualization and imaging)  
  47.27.De (Coherent structures)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11602299, 11872374, and 51809271).
Corresponding Authors:  Zhenbing Luo, Xiong Deng     E-mail:  luozhenbing@163.com;badi_arg@126.com

Cite this article: 

Qiang Liu(刘强), Zhenbing Luo(罗振兵), Xiong Deng(邓雄), Zhiyong Liu(刘志勇), Lin Wang(王林), Yan Zhou(周岩) Supersonic boundary layer transition induced by self-sustaining dual jets 2020 Chin. Phys. B 29 014704

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