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

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

更新时间：2026-05-28

- Direct numerical simulation of turbulent and high-temperature gas effect coupled flow
- Vol. 38, Issue 6, Pages: 1111-1119,1128(2020)
- 作者机构：
  
  1. 北京航空航天大学,北京,100191
  2. 中国航天科技集团航天飞行器气动热防护实验室,北京,100191
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2020.0132
  CLC： O354.7;O357.4
- Published：2020
- 稿件说明：
移动端阅览
吴正园, 莫凡, 高振勋, 蒋崇文, 李椿萱. 湍流边界层与高温气体效应耦合的直接数值模拟[J]. 空气动力学学报, 2020, 38(6): 1111-1119,1128.

WU Zhengyuan, MO Fan, GAO Zhenxun, et al. Direct numerical simulation of turbulent and high-temperature gas effect coupled flow[J]. 2020, 38(6): 1111-1119,1128.
吴正园, 莫凡, 高振勋, 蒋崇文, 李椿萱. 湍流边界层与高温气体效应耦合的直接数值模拟[J]. 空气动力学学报, 2020, 38(6): 1111-1119,1128. DOI： 10.7638/kqdlxxb-2020.0132.

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

摘要

针对高超声速湍流边界层开展了直接数值模拟研究，对高温气体效应与湍流的耦合作用机理进行了分析。研究表明，高温气体效应使边界层内平均温度显著降低，平均密度显著升高。对于湍流脉动量，高温气体效应对温度脉动有较强的抑制作用，而对流向及壁面法向速度脉动和密度脉动的影响趋势在近壁面区域和边界层外层是相反的。在近壁面区域，流向和壁面法向速度脉动和密度脉动都被增强，而在边界层外层，高温气体效应则会抑制该速度脉动和密度脉动。在整个边界层内，高温气体效应使展向速度脉动降低。对于边界层内的雷诺应力，在

500区域，高温气体效应会使雷诺应力值减小；而在

500的近壁面区域内，高温气体效应明显增大了雷诺应力值，进而增强了湍流引起的动量交换，从而使壁面处速度梯度增加，最终使摩擦阻力增加。对壁面热流，高温气体效应引起的较明显的平均温度降低使得壁面温度梯度降低，导致热流降低。高温气体效应使壁面平均压强和脉动压强均增加。

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

500 in boundary layer

while increases the Reynolds stress value in the region of

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.

关键词

Keywords

references

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