当前位置: X-MOL 学术Shock Vib. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Influence of Cavity Width on Attenuation Characteristic of Gas Explosion Wave
Shock and Vibration ( IF 1.6 ) Pub Date : 2021-02-26 , DOI: 10.1155/2021/6634754
Dengke Xu 1 , Chaomin Mu 2, 3 , Zhongqing Li 2, 3 , Wenqing Zhang 2, 3
Affiliation  

This study aimed to investigate the influence of cavity width on the attenuation characteristic of gas explosion wave. Attenuation mechanism of gas explosion wave through cavity was obtained by numerical simulation. The gas explosion shock wave energy can be greatly attenuated through the cavity structure in five stages, namely, plane wave, expansion, oblique reflection, Mach reflection, and reflection stack, to ensure that it is eliminated. Cavities with various width sizes, namely, 500300200, 500500200, and 500800200 (lengthwidthheight, unit: mm), were experimented to further investigate the attenuation characteristics through a self-established large-size pipe gas explosion experimental system with 200 mm diameter and 36 m length. Results showed an evident attenuation effect on flame duration light intensity (FDLI) and peak overpressure with increasing cavity width. Compared with 300 mm, the overall FDLI decreased by 83.0%, and the peak overpressure decreased by 71.2% when the cavity width was 800 mm. The fitting curves of the FDLI and peak overpressure attenuation factors to width-diameter demonstrated that the critical width-diameter was 2.19 when the FDLI attenuation factor was 1. The FDLI attenuation factor sharply decreased at the width-diameter ratio range from 1.5 to 2.5 and basically remained steady at 0.17 at the width-diameter ratio range from 2.7 to 4.0. The peak overpressure attenuation factor gradually decreased with the increase of width-diameter ratio and changed from 0.93 to 0.28 with width-diameter ratio from 1.5 to 4.0. The research results can serve as a good reference for the design of gas explosion wave-absorbing structures.

中文翻译:

腔宽对气体爆炸波衰减特性的影响

本研究旨在探讨腔宽对气体爆炸波衰减特性的影响。通过数值模拟获得了气体爆炸通过腔体的衰减机理。气体爆炸冲击波能量可以通过腔结构在平面波,膨胀,倾斜反射,马赫反射和反射叠层这五个阶段中大大衰减,以确保消除。具有各种宽度尺寸,即空腔500 300 200 500 500 200和500 800 200(长宽度通过自行建立的直径为200 mm,长度为36 m的大型管道燃气爆炸实验系统进行了实验,以进一步研究衰减特性。结果表明,随着腔宽度的增加,对火焰持续时间光强度(FDLI)和峰值超压的衰减效果明显。与300 mm相比,当腔宽为800 mm时,整体FDLI降低了83.0%,峰值超压降低了71.2%。FDLI和峰值过压衰减因数对宽度的拟合曲线表明,当FDLI衰减因数为1时,临界宽度为2.19。FDLI衰减因数在宽度与直径之比从1.5到2.5急剧减小时,急剧减小。宽径比在2.7至4.0范围内基本保持稳定在0.17。峰值超压衰减因数随宽径比的增加而逐渐减小,并从0.93变为0.28,宽径比从1.5变为4.0。研究结果可为瓦斯爆炸吸波结构的设计提供参考。
更新日期:2021-02-26
down
wechat
bug