Direct numerical simulation of turbulent and high-temperature gas effect coupled flow

WU Zhengyuan; MO Fan; GAO Zhenxun; JIANG Chongwen; LEE Chunhian

doi:10.7638/kqdlxxb-2020.0132

ACTA AERODYNAMICA SINICA > 2020 > 38(6): 1111-1119,1128. > DOI: 10.7638/kqdlxxb-2020.0132

WU Zhengyuan, MO Fan, GAO Zhenxun, JIANG Chongwen, LEE Chunhian. Direct numerical simulation of turbulent and high-temperature gas effect coupled flow[J]. ACTA AERODYNAMICA SINICA, 2020, 38(6): 1111-1119,1128. DOI: 10.7638/kqdlxxb-2020.0132

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Direct numerical simulation of turbulent and high-temperature gas effect coupled flow

WU Zhengyuan^1,,
MO Fan¹,
GAO Zhenxun^{1, 2, ,},
JIANG Chongwen^{1, 2},
LEE Chunhian^{1, 2}

1.
Beihang University, Beijing 100191, China
2.
Laboratory of Aero-thermal Protection Technology for Aerospace Vehicles, China Aerospace Science and Technology Corporation, Beijing 100191, China

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Received Date: August 13, 2020
Revised Date: October 25, 2020
Available Online: January 07, 2021

Graphical Abstract

Abstract

Abstract

In this paper, direct numerical simulation (DNS) studies are carried out on the hypersonic and high-enthalpy turbulent boundary layer, and the coupling mechanism of the high-temperature gas effect and turbulence is analyzed. It is found that the high-temperature gas effect significantly reduces the mean temperature and increases the mean density in boundary layer, while reduce the temperature fluctuation. In the near-wall area, both the velocity fluctuation and density fluctuation are enhanced. But in the outer area of boundary layer, these turbulent fluctuations are suppressed by high-temperature gas effect. For the Reynolds stress, high-temperature gas effect decreases the Reynolds stress value in the area of y⁺>500 in boundary layer, while increases the Reynolds stress value in the region of y⁺ < 500, which in turn enhances the momentum exchange caused by turbulence. Thereby, skin friction is increased. The wall heat transfer is strengthened by high-temperature gas effect as well. Moreover, the high temperature gas effect increases both the mean pressure and the fluctuation pressure at wall.
- high temperature gas effect,
- turbulent boundary layer,
- direct numerical simulation,
- multiphysics coupling

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References (23)

References

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