Influence of Sandwich Structural Composites on the Explosion Propagation Law of Methane-air Mixture

doi:10.12382/bgxb.2023.1148

Abstract

Abstract:

The influence of sandwich structural composites with non-metallic core layer on the explosion propagation law of methane-air mixture is studied.The explosion experiments of the materials with different core layers,such as polyvinylidene fluoride(PVDF)foam board,hyriopsis cumingii shell and super absorbent polymer(SAP)colloid,are conducted on a self-developed experimental explosion pipe network platform.The influence rules of the sandwich structural composites with non-metallic cores on the explosion overpressure,flame propagation velocity,flame temperature and quenching parameter are analyzed.The research indicates that the sandwich structura; composites with non-metallic cores have good inhibition effects on the explosion propagation of methane-air mixture.Specifically,the composite material with PVDF foam board core layer shows the best inhibition effect on the flame temperature.The composite material with SAP colloid core layer shows the best inhibition effect on the explosion overpressure and flame propagation velocity,and its back-end quenching parameter is 9.20MPa·℃.Accordingly,the composite material with SAP colloid core layer has excellent explosion suppression properties.

Key words: composite material, gas explosion, sandwich structure, non-metallic core layer, decay rate, propagation law

CLC Number:

X932

ZHANG Baoyong, ZHANG Yiyu, TAO Jin, WANG Yajun, LIU Chuanhai, HAN Yonghui, SUN Man. Influence of Sandwich Structural Composites on the Explosion Propagation Law of Methane-air Mixture[J]. Acta Armamentarii, 2025, 46(1): 231148-.

Figures/Tables 13

Fig.1 Schematic diagram of the composition of sandwich structural composites

Fig.2 Explosion pipe network experimental platform

Table 1 Experimental material design parameters

实验工况编号	上下面板	体密度/ (g·cm^-3)	面板厚度/ mm	芯层	芯层厚度/ mm
Exp.1	泡沫铁镍	0.4~0.5	10
Exp.2	泡沫铁镍		10	PVDF泡沫板	5
Exp.3	泡沫铁镍		10	三角帆蚌贝壳	5
Exp.4	泡沫铁镍		10	SAP胶体	5

Fig.3 Physical image of sandwich structural composites

Fig.4 Variation of explosion overpressure with propagation distance

Table 2 Comparison of explosion overpressure decay rates and overpressure decrease rates sandwich structural composites with different core layers

实验工况编号	p_max/ MPa	p_i/ MPa	dp/dt/ (MPa·s^-1)	ζ/%
Exp.1	0.707	0.525	13.48	25.74
Exp.2	0.641	0.181	34.56	71.76
Exp.3	0.736	0.477	20.65	38.19
Exp.4	0.637	0.128	49.39	79.65

Fig.5 Explosion overpressure suppression effect

Fig.6 Variation of flame propagation velocity with propagation distance

Fig.7 Flame velocity suppression effect

Fig.8 Variation of flame temperature with propagation distance

Table 3 Flame temperature decay ratios and quenching parameters of sandwich structural composites with different core layers

实验工况编号	T/℃			T_max-T_i/℃	η/%	θ₁/(MPa·℃)	θ₂(MPa·℃)
实验工况编号	T1	T2	T3	T_max-T_i/℃	η/%	θ₁/(MPa·℃)	θ₂(MPa·℃)
Exp.1	971.830	1213.557	539.448	674.109	55.55	857.985	283.210
Exp.2	1191.612	1501.398	124.163	1377.235	91.73	962.396	22.474
Exp.3	1112.450	1457.640	355.401	1102.239	75.62	1072.823	169.526
Exp.4	1027.891	1423.811	137.163	1286.648	90.37	906.968	17.557

Fig.9 Quenching parameters

Fig.10 Schematic diagram of explosion suppression effects of sandwich structural composites

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