铝粉/空气二维黏性两相爆轰的数值模拟

韦伟; 翁春生

doi:10.11883/1001-1455(2015)01-0029-07

铝粉/空气二维黏性两相爆轰的数值模拟

doi: 10.11883/1001-1455(2015)01-0029-07

韦伟^{1, 2},
翁春生^1,

1.
南京理工大学瞬态物理国家重点实验室，江苏南京 210094
2.
江苏海事职业技术学院，江苏南京 211170

基金项目: 中央高校基本科研业务费专项基金项目(30920130112007);国防预研究基金项目(9140C300202120C30)

详细信息

作者简介:
韦伟(1980—), 女, 博士研究生, 讲师

中图分类号: O381; TJ011.1
计量
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- 被引次数: 0
出版历程
- 收稿日期: 2013-05-10
- 修回日期: 2013-09-13
- 刊出日期: 2015-01-25

Numerical simulation for aluminum/air two-dimensional viscous two-phase detonation

Wei Wei^{1, 2},
Weng Chun-sheng^1
,

1.
National Key Laboratory of Transient Physics, Nanjing University of Scienceand Technology, Nanjing 210094, Jiangsu, China
2.
Jiangsu Maritime Institute, Nanjing 211170, Jiangsu, China

摘要

摘要: 为了深入研究爆轰波形成和传播的机理与特性，建立了管内铝粉/空气二维黏性两相爆轰过程的数学模型，采用守恒元与求解元方法进行数值计算，并对其物理参数的分布进行了分析。结果表明：管内燃烧转爆轰的初期，压力沿径向变化明显，与壁面碰撞有明显的反射波；燃烧转爆轰的中后期，压力沿轴向变化明显，但径向效应仍不能忽视，碰撞形成的反射波对最终稳定爆轰波的形成影响较大。研究结果同时表明：不仅铝粉颗粒初始半径对爆轰波的形成与传播有一定的影响；而且气体的黏性作用在研究爆轰管内近壁面处流场时不容忽视。研究结果有利于进一步揭示铝粉燃烧转爆轰的机理。
- 爆炸力学 /
- 两相流 /
- CE/SE方法 /
- 铝粉尘 /
- 爆轰
Abstract: A two-dimensional mathematical model of viscous aluminum/air two-phase detonation is established. The flow field inside the detonation tube was calculated by the method of conservation element and solution element. And the distribution of physical parameters is analyzed. Numerical results show that in the early stages of the deflagration-to-detonation transition process in the tube, pressure change obviously along the radius and significant reflection wave is collided off the wall. In the later period, pressure along the axis changes obviously, but the radial effect still can't be ignored. The reflection wave from the collision is important on the formation of steady detonation wave. Numerical results also show that the initial radius of the aluminum powder particles have certain influence on the formation and propagation of detonation wave. And certain influence of gas viscosity on flow field near the wall in the detonation tube was exerted. The results of the study can be utilized to reveal the mechanism of the deflagration-to-detonation transitim.
- mechanics of explosion /
- two phase flow /
- CE/SE method /
- aluminum dust /
- detonation

HTML全文

图 1 不同时刻爆轰管内压力分布云图

Figure 1. Pressure contours at different times

下载: 全尺寸图片幻灯片

图 2 不同时刻爆轰管轴线处铝粉颗粒半径变化图

Figure 2. Particle radius at different times

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图 3 不同颗粒半径时爆轰管轴线处压力随时间变化图

Figure 3. Times evolution of the pressures along the axis of detonation tube for different particle radius

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图 4 爆轰波阵面附近速度云图

Figure 4. Velocity contours near the detonation wave

下载: 全尺寸图片幻灯片

图 5 不同时刻爆轰管管壁处速度变化图

Figure 5. Velocity profiles along the wall at different times

下载: 全尺寸图片幻灯片

图 6 不考虑黏性时t=44 μs时刻爆轰管内压力分布云图

Figure 6. Pressure contours at t=44 μs (taking no account of viscous)

下载: 全尺寸图片幻灯片

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