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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (S2): 729396-729396.doi: 10.7527/S1000-6893.2023.29396

• Near Space Technology • Previous Articles     Next Articles

Flow control and drag reduction characteristics of micro-blowing array on supersonic turbulent boundary layer

Fanyu ZENG1, Yunlong QIU2(), Zhanwei CAO3,4, Lun ZHANG1, Weifang CHEN1   

  1. 1.School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China
    2.Advanced Aircraft Research Center,Huanjiang Laboratory,Shaoxing 311800,China
    3.Science and Technology on Space Physics Laboratory,China Academy of Launch Vehicle Technology,Beijing 100076,China
    4.School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China
  • Received:2023-08-01 Revised:2023-08-03 Accepted:2023-08-18 Online:2023-08-25 Published:2023-08-24
  • Contact: Yunlong QIU E-mail:qyl1992@zju.edu.cn
  • Supported by:
    Specialized Research Projects of Huanjiang Laboratory(HJ-2023-06)

Abstract:

Direct Numerical Simulations (DNS) are used to study the flow control mechanism and drag reduction characteristics of square micropores array micro-blowing on supersonic turbulent boundary layer. The 0.3 mm × 0.3 mm micropores array with a horizontal and longitudinal number of 88×6 is arranged in the spatially developing turbulent region. The horizontal and longitudinal center distance of porous region is 0.6 mm, and the porosity is 25%. The amplitudes of micro-blowing array are 0.2% (B1), 0.4% (B2) and 0.6% (B3) of the freestream velocity, respectively. The calculation results show that the micro-blowing technology can reduce surface friction on supersonic turbulent boundary layer. The total friction of porous region is reduced by 23% at the blowing amplitude of 0.6%, and the drag reduction rate approximately exhibits a linear increase with the increase of micro-blowing amplitude. The results of the turbulent kinetic energy equilibrium analysis show that all source terms of the turbulent kinetic energy equilibrium equation are enhanced after blowing control is applied. The micro-blowing technology promotes the energy cascade process in the near-wall region, and destroys the self-sustaining mechanism between velocity streaks and quasi-streamwise vortices within the original turbulent boundary layer. The quadrant analysis of velocity pulsation on boundary layer shows that the drag reduction of the micro-blowing technique comes from its inhibitory effect on the downward sweeping process in the near-wall region.

Key words: micro-blowing, square micropores array, turbulent boundary layer, drag reduction, turbulent coherent structure

CLC Number: