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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (21): 528520-528520.doi: 10.7527/S1000-6893.2023.28520

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Entropy increase characteristics of shock wave/plate laminar boundary layer interaction

Jiahui SONG1,2,3, Aiguo XU2,4,5, Long MIAO1,6(), Yugan LIAO1, Fuwen LIANG1, Feng TIAN1, Mingqing NIE1, Ningfei WANG1   

  1. 1.School of Aerospace Engineering,Beijing Institute of Technology,Beijing  100081,China
    2.National Key Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing  100088,China
    3.National Key Laboratory of Shock Wave and Detonation Physics,Mianyang  621900,China
    4.State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing  100081,China
    5.HEDPS,Center for Applied Physics and Technology,College of Engineering,Peking University,Beijing  100871,China
    6.Chongqing Innovation Center,Beijing Institute of Technology,Chongqing  404100,China
  • Received:2023-02-01 Revised:2023-03-01 Accepted:2023-07-23 Online:2023-11-15 Published:2023-08-11
  • Contact: Long MIAO E-mail:miaolong@bit.edu.cn
  • Supported by:
    National Natural Science Foundation of China(12172061);Foundation of National Key Laboratory of Shock Wave and Detonation Physics;Foundation of National Key Laboratory of Computational Physics;The Opening Project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology)(KFJJ23-02M);National Key Research and Development Program(2020YFC2201100);China Postdoctoral Science Foundation(2021M690392);Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology(LabASP-2021-04)

Abstract:

There exist complex shock wave/boundary layer interaction phenomena in supersonic flow. The main sources of aerodynamic drag in scramjet engines are “friction drag” caused by boundary layer and “wave drag” caused by shock wave, both of which are directly related to entropy increase, so entropy increase is the key parameter to evaluate the aerodynamic drag. Discrete Boltzmann Modeling and Analysis Method (DBM) based on non-equilibrium statistical physics is used to simulate high mach number regular reflection and shock wave/laminar boundary layer interaction problem. With the help of high-order non-conserved kinetic moments, DBM can easily capture thermodynamic non-equilibrium effects such as viscosity and heat conduction, and quantify the entropy production rate caused by them. The results show that for regular reflection, the non-equilibrium intensity of the reflected shock wave is stronger than that of the incident shock wave. For shock wave/laminar boundary layer interaction, entropy production rate caused by viscosity is dominant in shock wave, and entropy production rate caused by heat conduction is dominant in boundary layer. The intensity of the two entropy production rates increases with the increase of Mach number. The research results can provide theoretical guidance for evaluating the flow quality in the inlet.

Key words: scramjet engine, entropy increase, non-equilibrium characteristics, discrete Boltzmann method, shock wave/laminar boundary layer interaction

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