惯性颗粒在非均匀加速流中的输运问题

doi:10.7527/S1000-6893.2021.26390

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惯性颗粒在非均匀加速流中的输运问题

李青^1,2, 涂国华^1,2, 余钊圣³, 林昭武³, 李婷婷^1,4, 袁先旭^1,2

1. 中国空气动力研究与发展中心空气动力学国家重点实验室, 绵阳 621000;
2. 中国空气动力研究与发展中心计算空气动力研究所, 绵阳 621000;
3. 浙江大学航空航天学院流体工程研究所, 杭州 310027;
4. 西安交通大学化学工程与技术学院, 西安 710049

收稿日期:2021-09-01 修回日期:2021-09-16 发布日期:2021-10-12
通讯作者: 袁先旭 E-mail:yuanxianxu@cardc.cn
基金资助:
国家重点研发计划（2019YFA0405200）

Inertial particle transport in non-uniform accelerated flow

LI Qing^1,2, TU Guohua^1,2, YU Zhaosheng³, LIN Zhaowu³, LI Tingting^1,4, YUAN Xianxu^1,2

1. State Key Laboratory of Aerodynamic, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
3. Institute of Fluid Engineering, School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China;
4. School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China

Received:2021-09-01 Revised:2021-09-16 Published:2021-10-12
Supported by:
Key Research and Development Program of China (2019YFA0405200)

摘要/Abstract

摘要： 基于新型碳基颗粒增强或碳基纤维材料的再入体热烧蚀问题对飞行器的气动力/热性能影响机制尚不明确。初步研究不考虑化学反应和气体引射效应，把热烧蚀问题中的颗粒剥离问题模化为驻点流中的离散颗粒启动问题。由于高速气流在驻点温度达上万度量级，局部马赫数接近于0，研究近似假设靠近壁面的流体动力学为不可压缩的，并使用不可压缩颗粒解析的直接数值模拟方法（PR-DNS）研究一个惯性颗粒在平面挤压流和壁面驻点流中的动力学，从而揭示在驻点流中的颗粒输运机制。研究发现颗粒在壁面驻点流中的输运机制是水平输运，几乎没有垂直输运，与平行剪切颗粒床输运非常不同，这是驻点流特有的垂直向下挤压作用导致的。

关键词: 挤压流, 壁面驻点流, 颗粒输运机制, 惯性颗粒, 颗粒解析的直接数值模拟

Abstract: The effect of thermal ablation of novel carbon fiber composites material on the aerodynamic force and heat is not fully understood. As the primary research, without considering the chemical reaction, gas injection and other complicate physical process, this study assumes the particle loss from the vehicle surface as a discrete particles dynamics problem. Because of the high temperature in the near wall, and that the local Mach number is vanishingly small, so the near wall fluid flow can be treated as incompressible. Thereby, Particle Resolved Direct Numerical Simulation (PR-DNS) of incompressible flow is used to study the particle dynamics in a strain flow and wall-bounded stagnation point flow. It is found that the particle transport in a wall-bounded stagnation point flow is horizontal, with minimal vertical transport, which is very different from that of parallel shear flow over a particles bed. This is due to the normal hydrodynamic force of stagnation point flow.

Key words: strain flow, wall-bounded stagnation point flow, particle transport mechanism, inertial particle, particle resolved direct numerical simulation

中图分类号:

李青, 涂国华, 余钊圣, 林昭武, 李婷婷, 袁先旭. 惯性颗粒在非均匀加速流中的输运问题[J]. 航空学报, 2021, 42(S1): 726390-726390.

LI Qing, TU Guohua, YU Zhaosheng, LIN Zhaowu, LI Tingting, YUAN Xianxu. Inertial particle transport in non-uniform accelerated flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(S1): 726390-726390.

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惯性颗粒在非均匀加速流中的输运问题

Inertial particle transport in non-uniform accelerated flow

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