密闭空间内爆炸载荷抑制效应实验研究

孔祥韶; 王子棠; 况正; 周沪; 郑成; 吴卫国

doi:10.11883/bzycj-2020-0193

密闭空间内爆炸载荷抑制效应实验研究

doi: 10.11883/bzycj-2020-0193

孔祥韶^1,,
王子棠²,
况正²,
周沪²,
郑成^1, ,,
吴卫国¹

1.
武汉理工大学绿色智能江海直达船舶与邮轮游艇研究中心，湖北武汉 430063
2.
武汉理工大学交通学院船舶、海洋与结构工程系，湖北武汉 430063

基金项目: 装备预先研究教育部联合基金青年人才项目（6141A02033108）

详细信息

作者简介:
孔祥韶（1983－　），男，教授，博士生导师，kongxs@whut.edu.cn

通讯作者:
郑　成（1991－　），男，讲师，zhengchengyeep@whut.edu.cn

中图分类号: O381
计量
- 文章访问数: 569
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- 被引次数: 0
出版历程
- 收稿日期: 2020-06-11
- 修回日期: 2020-08-31
- 网络出版日期: 2021-05-13
- 刊出日期: 2021-06-05

Experimental study on the mitigation effects of confined-blast loading

1.
Green & Smart River-Sea-Going Ship, Cruise and Yacht Research Center, Wuhan University of Technology, Wuhan 430063, Hubei, China
2.
Department of Naval Architecture, Ocean and Structural Engineering, School of Transportation, Wuhan University of Technology, Wuhan 430063, Hubei, China

摘要

摘要: 炸药在密闭空间内爆炸时的爆炸载荷与在敞开环境中有很大差异，在密闭空间内，TNT炸药的爆炸产物能够与周围空气充分混合并发生燃烧反应进而释放额外的能量，使密闭空间内的反射冲击波及准静态压力均明显增加。为探究不同气体环境对密闭空间内爆炸载荷的抑制效应，开展了3种不同药量的TNT分别在空气、水雾和氮气环境密闭空间内的爆炸实验研究，通过理论计算和实验对比分析了密闭空间内的爆炸载荷压力、温度及受载钢板试件响应特性。结果表明，水雾和氮气均能有效降低空间内的准静态压力和温度，对准静态压力的平均降幅分别为36.0%和51.7%，对温度的平均降幅分别为42.6%和40.3%；在水雾和氮气环境中的爆炸载荷作用下，钢板试件动态响应较空气环境中显著降低，其中160 g药量下，水雾和氮气环境中钢板试件的最终变形分别减少了15.9%和23.5%，氮气的减弱效果优于水雾；水雾和氮气均能及时有效地抑制封闭空间内的爆炸载荷，降低结构的损伤程度。
- 内爆载荷 /
- 水雾 /
- 氮气 /
- 准静态压力 /
- 钢板动态响应
Abstract: The blast loading from an explosion in a confined space is quite different from that in an open environment. The detonation products of TNT can be fully mixed with the surrounding air, and release additional energy through combustion effect, resulting in a significantly increase of the reflected shockwaves and quasi-static pressure in the confined space.In order to investigate the mitigation effect of different atmosphere on explosion load in confined space, the experimental tests of TNT with three different charge masses were performed in a fully confined chamber filled with air, water mist and nitrogen, respectively. The explosive load pressure, temperature and the response characteristics of blast-loaded steel plates in the confined space were analyzed by theoretical calculation and experiment. The results show that both the water mist and the nitrogen can effectively reduce the reflected shock wave, the quasi-static pressure and the temperature in the confined chamber. The average reduction rate of quasi-static pressure is 36.0% and 51.7%, and the average reduction rate of temperature is 42.6% and 40.3%, respectively. The ideal gas state equation was used to calculate the theoretical value of quasi-static pressure in the confined space filled with nitrogen. It is found that the theoretical value is slightly larger than the experimental value, which is due to the insufficient combustion of detonation products in the test. The dynamic response of blast-loaded steel plates in water mist and nitrogen atmosphere is significantly lower than that in the air condition, and the residual deformation of the steel plate at 160 g TNT in water mist and air conditions, the attenuating effect of nitrogen is better than that of water mist. It is revealed that the mechanism of the water mist and nitrogen in mitigating the confined blast load and the subsequent dynamic response of structure is restraining the energy release from the combustion of the detonation products. The conclusions can provide references for the design of anti-blast structure.
- confined-blast loading /
- water mist /
- nitrogen /
- quasi-static pressure /
- dynamic response of steel plates

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图 1 爆炸实验装置示意图

Figure 1. Schematic diagram of experimental setup

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图 2 水雾孔分布位置图（爆炸箱俯视图）

Figure 2. Schematic of distribution of nozzles of the chamber (top view of chamber)

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图 3 不同粒径水雾的体积分数

Figure 3. Volume fraction of the water mist with different diameter

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图 4 氧气浓度仪及出气阀布置

Figure 4. Distribution of oxygen concentrator and outlet valve

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图 5 压力和温度传感器布置图

Figure 5. Arrangement of temperature and pressure sensors

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图 6 DIC测试系统布置示意图

Figure 6. Schematic of DIC system arrangement

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图 7 80 g TNT水雾和空气环境工况下P1测点压力历程

Figure 7. Pressure-time curves of measuring point P1 from 80 g TNT explosion in chamber filled with water mist and air

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图 8 120 g TNT水雾和空气环境工况下P1测点压力历程

Figure 8. Pressure-time curves of measuring point P1 from120 g TNT explosion in chamber filled with water mist and air

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图 9 160 g TNT水雾和空气环境工况下P1测点压力历程

Figure 9. Pressure-time curves of measuring point P1 from160 g TNT explosion in chamber filled with water mist and air

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图 10 80 g TNT在氮气和空气环境工况下测点P1处的压力时程曲线

Figure 10. Pressure-time curves of measuring point P1 from80 g TNT explosion in chamber filled with nitrogen and air

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图 11 120 g TNT氮气和空气环境工况下P1测点压力历程

Figure 11. Pressure-time curves of measuring point P1 from120 g TNT explosion in chamber filled with nitrogen and air

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图 12 160 g TNT氮气和空气环境工况下P1测点压力历程

Figure 12. Pressure-time curves of measuring point P1 from160 g TNT explosion in chamber filled with nitrogen and air

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图 13 氮气工况下准静态压力计算值与实验值对比

Figure 13. Comparison between calculated results and experiment results of quasi-static pressure in nitrogen environment

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图 14 80 g TNT在3种环境工况下测点T1处的温度曲线

Figure 14. Temperature-time curves of measuring point T1 in the conditions of 80 g TNT with air, water mist and nitrogen

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图 15 120 g TNT在3种环境工况下测点T1处的温度曲线

Figure 15. Temperature-time curves of measuring point T1 in the conditions of 120 g TNT with air, water mist and nitrogen

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图 16 160 g TNT在3种环境工况下测点T1处的温度曲线

Figure 16. Temperature-time curves of measuring point T1 in the conditions of 160 g TNT with air, water mist and nitrogen

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图 17 空气和水雾环境中3种药量工况下试件板中心点变形历程对比

Figure 17. Comparison of the mid-point deflection of plates at different charge masses in water mist and air conditions

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图 18 160 g药量下3种不同气体环境中试件板中心点的变形历程

Figure 18. Mid-point deflection of plates at 160 g TNT in three different environments

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表 1 试件材料力学性能

Table 1. Mechanical properties of the steel plates

杨氏模量/GPa	硬化模量/GPa	泊松比	屈服强度/MPa	密度/(kg·m⁻³)
206	1.06	0.28	324	7850

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表 2 水雾粒径及累积体积分数

Table 2. Water-mist diameter and cumulative volume fraction

粒径/μm	5	10	20	45	75	100	200	300
体积分数/%	0.00	0.03	2.09	19.28	55.53	79.00	99.77	100.00

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表 3 工况设置

Table 3. Load conditions of experimental test

工况	试件板厚度/mm	TNT质量/g	舱内环境
1	4.0	80	空气
2	4.0	120	空气
3	4.0	160	空气
4	4.0	80	水雾
5	4.0	120	水雾
6	4.0	160	水雾
7	−	80	氮气
8	3.0	120	氮气
9	4.0	160	氮气

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表 4 圆柱形TNT炸药的尺寸

Table 4. Detailed size of cylindrical TNT charges

TNT质量/g	高度/mm	直径/mm
80	40.5	40.6
120	38.9	50.3
160	51.5	50.4

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表 5 水雾和空气环境内爆载荷及等效能量

Table 5. Confined-blast loading and equivalent energy in chamberfilled with water mist and air

TNT质量/ g	舱内环境	首冲击波峰值/kPa	准静态压力峰值/kPa	准静态压力降低率/%	等效能量/ (kJ·kg⁻¹)
80	空气	546.7	262.8	31.1	9461.0
80	水雾	336.2	181.1	31.1	6520.8
120	空气	722.6	358.3	34.7	8600.1
120	水雾	669.4	233.8	34.7	5612.3
160	空气	1033.1	490.6	42.1	8831.3
160	水雾	693.9	284.1	42.1	5113.2

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表 6 氮气和空气环境中的内爆载荷及等效能量

Table 6. Confined-blast loading and equivalent energy in chamber filled with nitrogen and air

TNT质量/g	舱内环境	首冲击波峰值/kPa	准静态压力峰值/kPa	准静态压力降低率/%	等效能量/(kJ·kg⁻¹)
80	空气	546.7	262.8	53.8	9461.0
80	氮气	554.7	121.5	53.8	4375.6
120	空气	722.6	358.3	48.9	8600.1
120	氮气	728.6	183.0	48.9	4392.2
160	空气	1033.1	490.6	52.3	8831.3
160	氮气	908.8	234.2	52.3	4215.8

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表 7 氮气工况下箱内气体属性

Table 7. Parameters of gasin chamber filled with nitrogen

气体	比定容热容/（kJ·kg⁻¹·K⁻¹）（25 ℃）	密度/（kg·m⁻³）（25 ℃）
水蒸气（H₂O）	1.400
一氧化碳（CO）	0.743	1.250
氮气（N₂）	0.741	1.250
氧气（O₂）	0.657	1.429
二氧化碳（CO₂）	0.638	1.977

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表 8 氮气工况下各药量下准静态压力计算值

Table 8. Calculated results of quasi-static pressure in nitrogen environment

TNT质量/g	m_g/g	c_V/（kJ·kg⁻¹·K⁻¹）	p_qs/kPa
80	1530.4	0.739	123.5
120	1570.4	0.741	185.6
160	1610.4	0.747	239.1

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表 9 水雾和空气环境工况不同测点位置的温度峰值平均值

Table 9. Average value of temperature peaks at different measuring points in water mist and air conditions

TNT质量/g	空气工况		水雾工况
TNT质量/g	T1、T3、T5点温度平均值/℃	T2、T4点温度平均值/℃	T1、T3、T5点温度平均值/℃	T2、T4点温度平均值/℃
80	479.5	399.3	338.3	191.2
120	586.0	488.9	404.4	254.3
160	748.5	817.5	460.1	355.3

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表 10 水雾工况相较于空气工况的温度峰值下降比例

Table 10. Proportion of peak temperature drop in water mist condition relative to air conditions

TNT质量/g	T1、T3、T5点温度平均值降低比例/%	T2、T4点温度平均值降低比例/%	整体温度峰值平均值降低比例/%
80	29.5	52.1	40.8
120	31.0	48.0	39.5
160	38.5	56.5	47.5

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表 11 氮气和空气环境工况下不同测点位置的温度峰值平均值

Table 11. Average value of temperature peaks at different measuring points in water mist and air conditions

TNT质量/g	空气工况		氮气工况
TNT质量/g	T1、T3、T5点温度平均值/℃	T2、T4点温度平均值/℃	T1、T3、T5点温度平均值/℃	T2、T4点温度平均值/℃
80	479.5	399.3	180.9	124.6
120	586.0	488.9	480.5	422.8
160	748.5	817.5	557.6	475.5

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表 12 氮气工况相较于空气工况下温度峰值下降比例

Table 12. Proportion of peak temperature drop in nitrogen condition relative to air conditions

TNT质量/g	T1、T3、T5点温度平均值降低比例/%	T2、T4点温度平均值降低比例/%	整体温度峰值平均值降低比例/%
80	62.3	68.8	65.5
120	18.0	25.6	21.8
160	25.5	41.8	33.7

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表 13 空气和水雾环境工况下内爆载荷的等效冲量

Table 13. Equivalent impulse of confined-blast loading at different charge masses in water mist and air conditions

TNT质量/g	舱内环境	δ/h	I_eq/(N·s)	饱和响应时间/ms	p_a/kPa
80	空气	8.5	723.9	2.4	477.3
	水雾	7.0	598.3	2.5	373.9
	氮气
120	空气	11.0	934.1	2.2	654.5
	水雾	9.3	793.6	2.3	539.2
	氮气	14.7	704.4	2.5	440.3
160	空气	13.2	1124.6	2.6	689.1
	水雾	11.1	946.4	2.4	616.2
	氮气	10.1	854.8	2.4	556.5

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