Quadrant decomposition analysis of fluctuations in high-temperature turbulent boundary layer with chemical non-equilibrium

被引：0
|
作者：
Liu P. [1 ,2 ]
Yuan X. [1 ,2 ]
Liang F. [1 ,2 ]
Li C. [1 ,2 ]
Sun D. [1 ,2 ]
机构：
[1] State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang
[2] Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2021年 / 42卷
基金：
中国国家自然科学基金;
关键词：
Chemical non-equilibrium; Direct Numerical Simulation(DNS); High-temperature; Quadrant decomposition; Turbulent boundary layer;
D O I：
10.7527/S1000-6893.2021.26338
中图分类号：
学科分类号：
摘要：
The surface of hypersonic vehicles will concurrently experience turbulence and chemical non-equilibrium flow during flight at a high Mach number and a low altitude. However, current research on the flow characteristics of such high-temperature turbulent boundary layers with chemical non-equilibrium is still limited, and understanding of the dominant flow mechanism of turbulence characteristics needs to be further deepened. Choosing the flow state after the leading shock of a cone, this study sets three different wall temperature to compare the distribution characteristics of boundary layer parameters through direct numerical simulation, and analyzes the contributions of different events to Reynolds shear stress, turbulent heat-flux, and turbulent mass diffusion using quadrant analysis. The results show that the contribution of ejections and sweeps to Reynolds shear stress is dominant in the entire boundary layer. The cold wall condition will cause change in the dominant events of both the streamwise and normalwise turbulent heat-flux on both sides of the temperature peak. The streamwise turbulent mass diffusion of O atom components is mainly affected by slow moving high-mass fraction motion and fast moving low-mass fraction motion, while that of the normalwise turbulent mass is dominated by upward moving high-mass fraction motion and inward moving low-mass fraction motion. © 2021, Beihang University Aerospace Knowledge Press. All right reserved.
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