﻿ 等体积比水雾对冲击波衰减规律研究
 舰船科学技术  2017, Vol. 39 Issue (10): 45-48 PDF

1. 海军工程大学 舰船工程系，湖北 武汉 430033;
2. 中国人民解放军92941部队，辽宁 葫芦岛 125000

Attenuation of a shock wave interacting with same volume ratio of water droplets
LIU Gui-bing1,2, HOU Hai-liang1, ZHU Xi1
1. College of Naval Architecture and Power, Naval University of Engineering, Wuhan 430033, China;
2. No. 92941 Unit of PLA, Huludao 125000, China
Abstract: In order to analyse function of water droplets using for restraint and attenuation of explosive shock wave, a method using numerical simulation, setting several models of single layer in z-axis with equal fiuld volume but different droplets number, analyzing interaction between shock wave and droplets, obtaining some conclusions. Consequently, the existence of droplets actually attenuate explosive shock wave. In the condition of equal droplets volume, a model within more droplets has a higher attenuation ratio, which shows that decentralized samll droplets present better than centralized droplets in defending shock wave. Three droplets in a model with volume ratio of 2.21×10–3 attacked by explosive source of 0.1 kg TNT at 0.2 m, the attenuation ratio of shock wave is 2.06%, it’s 3.14% of 9 droplets and 3.39% of 18 droplets.
Key words: shock wave     droplet broken     pressure wave     specific impulse
0 引　言

1 模型建立

 图 1 水雾抑爆宏观模型 Fig. 1 Macromodel of mist explosion suppression

 图 2 液滴模型 Fig. 2 Micromodel of multi-row droplets

 $P = {C_0} + {C_1}\mu + {C_2}{\mu ^2} + {C_3}{\mu ^3} + ({C_4} + {C_5}\mu + {C_6}{\mu ^2})E,$ (1)

 $\begin{split}P & = \frac{{{\rho _0}{C^2}\mu [1 + (1 - {\gamma _0}/2)\mu - {\mu ^2}{a_{\rm{m}}}/2]}}{{[1 - ({S_1} - 1)\mu - {S_2}{\mu ^2}/(1 + \mu ) - {S_3}{\mu ^3}/{{(\mu + 1)}^2}]}} + \\& \quad ({\gamma _0} + {a_m}\mu ){E_{\rm{V}}},\mu > 0,\end{split}$ (2)
 $P = {\rho _0}{c_l}^2\mu + ({\gamma _0} + {a_m}\mu ){E_{\rm{V}}},\;\;\;\mu < 0{\text{。}}$ (3)

2 等体积比液滴对冲击波衰减分析

 图 3 等体积比工况比冲量曲线 Fig. 3 Specific impluse curve of same volume

 图 4 测量压力曲线图 Fig. 4 Measuring pressure curve

 图 5 无液滴压力曲线图 Fig. 5 Pressure without droplet

3 机理分析

4 结　语

1）液滴的存在对冲击波有一定的削弱作用，且在液滴总体积比相同条件下，液滴数目多的工况比冲量衰减更大，可知分散的小液滴对冲击波的衰减作用强于集中的大液滴。

2）0.1 kgTNT在0.2 m爆距产生的冲击波在二维模型中，液滴体积比为2.21×10–3时液滴数为3时冲击波衰减2.06%，液滴数为9时冲击波衰减3.14%，液滴数为18时衰减3.39%。

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