铝粉尘爆轰的反应模型

岳军政; 洪滔; 吴先前; 黄晨光

doi:10.11883/bzycj-2020-0349

铝粉尘爆轰的反应模型

doi: 10.11883/bzycj-2020-0349

1.
中国科学院力学研究所，北京 100190
2.
北京应用物理与计算数学研究所，北京 100094

详细信息

作者简介:
岳军政（1988－　），男，博士，助理研究员，yuejz@imech.ac.cn

通讯作者:
吴先前（1982－　），男，博士，副研究员，wuxianqian@imech.ac.cn

中图分类号: O381
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-23
- 修回日期: 2020-11-24
- 网络出版日期: 2021-07-27
- 刊出日期: 2021-08-05

A modified reaction model of aluminum dust detonation

1.
Institute of Mechanics, Chinese Academy of Science, Beijing 100190, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

摘要

摘要: 铝粉反应模型是对悬浮铝粉尘气-固两相爆轰进行数值模拟研究的关键。通过考虑铝粉燃烧产物氧化铝（Al₂O₃）在高温下的分解吸热反应，改进了铝粉的扩散燃烧模型。将该模型嵌入到三维的气-固两相爆轰数值计算程序中，分别对铝粉/空气混合物以及铝粉/氧气混合物的爆轰进行了数值模拟，计算得到的稳定爆轰波速度与实验结果、文献值均吻合较好，误差小于5.5%，表明改进的铝粉反应模型适用于不同氧化气体氛围中铝粉尘爆轰的模拟计算。此外，对两相爆轰参数及爆轰流场的物理量分布进行分析，获得了铝粉反应模型对爆轰波结构的影响规律。
- 铝粉尘 /
- 反应模型 /
- 两相爆轰 /
- 逆反应
Abstract: The reaction model of aluminum particles is the key to successfully simulate the two-phase detonation of aluminum suspensions. In this study, by considering the endothermic decomposition reaction of the aluminum oxide (Al₂O₃) product at high temperature, a diffusion combustion model for the aluminum particles was improved and was incorporated into the homemade numerical code for 3D simulation of gas-solid two-phase detonation. The numerical program is based on the theory of two-phase flows, both gaseous and solid phases are assumed to be continuous media with inter-phase transfer of mass, momentum and energy. The system of 3D governing equations is solved in Cartesian x-y-z coordinates using an Eulerian grid, the numerical simulation code uses an explicit finite difference scheme based on the space-time conservation element and solution element (CE/SE) method, and the fourth order Runge-Kutta method is used to solve the source terms of the governing equations. In addition, the stability is assured by the Courant-Friedrichs-Lewy (CFL) criterion. Program parallelization is realized based on the message-passing-interface (MPI) technique, and the reliability of the program is demonstrated by simulating the shock tube problem successfully. Based on the program and the improved reaction model for the aluminum particles, numerical simulations for detonations of Al/air mixtures and Al/O₂ mixtures were performed, respectively, the simulated results of the steady detonation wave speeds are in agreement with the experimental results or the literature value, with the error of less than 5.5%, which demonstrate the validity of the improved reaction model for Al suspensions detonation in different oxidizing atmosphere. Moreover, the detonation parameters and the distributions of the physical quantities around the detonation wave are analyzed, and the influence law of the reaction model on the detonation wave structure is obtained.
- aluminum particles /
- reaction model /
- two-phase detonation /
- reverse reaction

HTML全文

图 1 数值模拟得到的密度和压力分布与理论计算结果^[20]的比较

Figure 1. Distributions of density and pressure by simulation and theory^[20]

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图 2 计算域横截面和局部区域初始压力云图

Figure 2. Transverse cross section of the computational domain and initial pressure contour of partial domain

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图 3 爆轰管轴线不同位置处压力历史

Figure 3. Pressure histories at different locations on the tube axis

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图 4 3.83 ms时刻铝粉/空气爆轰波阵面附近气体压力、气体温度、气体密度、气体轴向速度、铝粉体积分数以及铝粉轴向速度的分布

Figure 4. Distributions of gas pressure, gas temperature, gas density, gas velocity in the x direction, volume fraction of Al particles, and Al particles velocity in the x direction around the detonation wave for Al/air mixtures at t=3.83 ms

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图 5 3.83 ms时刻爆轰管轴上两相的轴向速度、气体温度以及氮气、氧气和铝粉的质量浓度分布

Figure 5. Longitudinal distributions of two phases velocities in the x direction, gas temperature, mass concentrations of nitrogen, oxygen and Al particles along the tube axis at t=3.83 ms

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图 6 模型改进前后计算得到的爆轰波附近气体温度和气体压力的分布

Figure 6. Distributions of gas temperature and gas pressure around the steady detonation wave calculated by the improved and previous models

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图 7 4.43 ms时刻铝粉/氧气爆轰波阵面附近气体压力、气体温度、气体密度、气体轴向速度、铝粉体积分数以及铝粉轴向速度的分布

Figure 7. Distributions of gas pressure, gas temperature, gas density, gas velocity in the x direction as well as volume fraction of Al particles, and Al particles velocity in the x direction around the detonation wave for Al/O₂ mixtures at t=4.43 ms

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图 8 4.43 ms时刻爆轰管轴上两相的轴向速度、气体温度以及铝粉、氧气的质量浓度分布

Figure 8. Longitudinal distributions of two phase velocities in the x direction, gas temperature, mass concentrations of oxygen and Al particles along the tube axis at t=4.43 ms

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