瓦斯爆炸压力与波前瞬态流速演化特征及其定量关系

林柏泉; 洪溢都; 朱传杰; 江丙友; 刘谦; 孙豫敏

doi:10.11883/1001-1455(2015)01-0108-08

瓦斯爆炸压力与波前瞬态流速演化特征及其定量关系

doi: 10.11883/1001-1455(2015)01-0108-08

林柏泉^{1, 2,},
洪溢都^{1, 2},
朱传杰^{1, 2},
江丙友³,
刘谦⁴,
孙豫敏^{1, 2}

1.
中国矿业大学安全工程学院，江苏徐州 221116
2.
煤炭资源与安全开采国家重点实验室，江苏徐州，221008
3.
安徽理工大学，安徽淮南 232001
4.
龙岩学院，福建龙岩 364012

基金项目: 国家重点基础研究发展计划(973计划)项目(2011CB201205)；国家自然科学基金青年科学基金项目(51204174)；中国矿业大学人才引进 & 青年教师启航计划(2011RC07)；中央高校基本科研业务费专项基金项目(2012QNB01)

详细信息

作者简介:
林柏泉(1960—), 男, 博士, 教授, lbq21405@126.com

中图分类号: O389; TD712.7
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- 被引次数: 0
出版历程
- 收稿日期: 2013-04-25
- 修回日期: 2013-11-13
- 刊出日期: 2015-01-25

Quantitative relationship between flow speed and overpressure of gas explosion in the open-end square tube

Lin Bai-quan^{1, 2
,},
Hong Yi-du^{1, 2},
Zhu Chuan-jie^{1, 2},
Jiang Bing-you³,
Liu Qian⁴,
Sun Yu-min^{1, 2}

1.
Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116 Jiangsu, China
2.
State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221008, Jiangsu, China
3.
School of Mining and Safety Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
4.
School of Resource Engineering, Longyan University, Longyan 364012, Fujian, China

摘要

摘要: 为了建立爆炸波前的瞬态流速和超压的定量关系，采用数值模拟的方法分别研究了开口型方管内瓦斯爆炸超压和瞬态流速传播特征。研究结果表明：开口型方管内，波前瞬态流速和超压的波形曲线的峰值个数不一样，而且超压峰值总是早于波前瞬态流速峰值出现。大部分情况下，方管横截面边长越大，其超压峰值相对较小，并且超压峰值沿传播方向呈现降低趋势。波前瞬态流速峰值沿传播方向呈不断增长趋势，而且方管横截面边长越大，其峰值也相对较小。长径比(方管长度与横截面边长之比)小于125时，超压峰值与波前瞬态流速峰值的定量关系始终呈现线性反比关系；大于或等于125时，超压峰值和波前瞬态流速峰值的定量关系呈分段关系。研究结果可为爆炸冲击波扬尘的研究提供基础数据。
- 爆炸力学 /
- 瞬态流速 /
- 超压 /
- 瓦斯爆炸
Abstract: The main objective of this study is to establish the quantitative relationship between overpressure and flow speed in the open-end square tube by the numerical simulation. It is found that the numbers of the peak value of overpressure and flow speed at the same measured point are different. The peak overpressure always appears earlier than peak flow speed in time scale. In mast cases, larger side lenth of square tube corresponds to smaller peak overpressure, and the peak flow speed goes down slowly along the propagation direction. The peak overpressure decreases with the increasing of the distance far from ignition end. However, the peak flow speed increases with the stream wise distance. When normalized distance is less than 125, the peak overpressure and peak flow speed always presents an inverse relationship. Otherwise, the relationship is piecewise-linear. The results may provide reference for the study on evaluating the dust lifting ability behind shock wave in the limited spaces.
- mechanics of explosion /
- flow speed /
- overpressure /
- gas explosion

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图 1 实验设备

Figure 1. Schematic of experimental equipment

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图 2 管道实验数据和数值模拟结果的对比

Figure 2. Comparison of numerical and experimental results

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图 3 超压和波前瞬态流速随时间的变化规律

Figure 3. Overpressure and flow speed versus time

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图 4 管道尺寸不同时超压峰值沿传播方向的分布

Figure 4. Overpressures in different tubes

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图 5 不同管道尺寸中流速峰值沿传播方向的分布

Figure 5. Flow velocities in different tubes

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图 6 超压峰值与波前瞬态流速峰值的定量关系

Figure 6. Relationships between flow velocities and overpressures

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图 7 斜率和截距的分布关系

Figure 7. Fitting curves of slope and intercept

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表 1 不同网格划分方法下的数值模拟结果的对比

Table 1. Relative error between simulation and experimental results for peak overpressures

l/m	p_max/MPa			E/%
	实验	数值模拟		E/%
	实验	4 cm×4 cm×4 cm	2 cm×2 cm×2 cm	4 cm×4 cm×4 cm	2 cm×2 cm×2 cm
0.5	0.196 5	0.213 17	0.202 84	8.05	-3.23
2.5	0.179 2	0.199 47	0.186 35	11.31	-3.99
4.5	0.120 6	0.141 54	0.110 53	17.36	8.35
注：表中的偏差以管道实验结果为基准，其顺序与数值模拟结果的呈对应关系。

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表 2 数值模拟结果与实验数据的对比

Table 2. Relative error between experimental and numerical results

l/m	p_max/MPa		E/%
l/m	实验	数值模拟	E/%
0.5	0.196 5	0.202 84	-3.23
1.0	0.190 2	0.201 68	-6.04
1.5	0.187 7	0.199 99	-6.55
2.0	0.182 1	0.194 83	-6.99
2.5	0.179 2	0.186 35	-3.99
3.0	0.168 1	0.175 77	-4.56
3.5	0.159 6	0.157 41	1.37
4.0	0.139 7	0.132 79	4.95
4.5	0.120 6	0.110 53	8.35

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