中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (11): 101-107.doi: 10.16265/j.cnki.issn 1003-3033.2020.11.015

• 安全工程技术 • 上一篇    下一篇

瓦斯体积分数对90°弯管泄爆特性的影响

黄强1,2, 穆朝民**1,2 教授, 王亚军3, 周辉1,2, 李重情1,2 副教授   

  1. 1 安徽理工大学 能源与安全学院,安徽 淮南 232001;
    2 安徽理工大学 煤矿安全高效开采省部共建教育部重点试验室,安徽 淮南 232001;
    3 黑龙江科技大学 安全工程学院,黑龙江 哈尔滨 150022
  • 收稿日期:2020-08-14 修回日期:2020-10-15 出版日期:2020-11-28 发布日期:2021-07-15
  • 通讯作者: **穆朝民(1977—),男,安徽准南人,博士,教授,主要从事冲击动力学、安全防护工程方面的研究。E-mail:chmmu@mail.ustc.edu.cn。
  • 作者简介:黄 强 (1994—),男,安徽淮南人,硕士研究生,研究方向为安全防护工程。E-mail:2608700294@qq.com。
  • 基金资助:
    安徽省高校自然科学研究项目(KJ2017A092);2019年研究生创新基金资助(2019CX2009)。

Effects of gas volume fraction on venting features of 90° elbows after explosion

HUANG Qiang1,2, MU Chaomin1,2, WANG Yajun3, ZHOU Hui1,2, LI Zhongqing1,2   

  1. 1 School of Energy and Safety, Anhui University of Science and Technology, Huainan Anhui 232001, China;
    2 Key Lab of Coal Safety and Efficiently Mining Constructed by Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan Anhui 232001,China;
    3 School of Safety Engineering, Heilongjiang University of Science and Technology, Harbin Heilongjiang 150022, China
  • Received:2020-08-14 Revised:2020-10-15 Online:2020-11-28 Published:2021-07-15

摘要: 为探究爆炸腔内不同体积分数的瓦斯发生爆炸时的传播特征和90°弯管的泄爆特性,开展泄爆管为90°弯管的瓦斯泄爆试验,采用数值模拟与试验研究2种方法,分析爆炸冲击波在该系统中的传播过程,探究6组不同体积分数下的瓦斯爆炸冲击波、火焰大小变化特征。结果表明:爆炸冲击波在管道中传播为多次超压,其峰值超压逐渐减小;爆炸腔内的冲击波峰值超压及其上升速率变化趋势相同,且均在瓦斯体积分数为9.5%时达到最大;在90°弯管中的相同位置处,不同体积分数的瓦斯产生的冲击波峰值超压上升速率呈锯齿形状;瓦斯体积分数为5.8%~11.0%时,传播管内火焰大小随传播距离呈锯齿形变化;瓦斯体积分数为5.8%和6.5%时,火焰在90°弯管前已熄灭;瓦斯体积分数为5.8%~11%时,冲击波峰值超压和火焰大小经90°弯管道后均有较明显的衰减。

关键词: 瓦斯体积分数, 90°弯管, 冲击波, 火焰大小, 泄爆特性, 数值模拟

Abstract: In order to explore propagation characteristics of gas with different volume fractions in explosion chambers and venting characteristics of 90° elbows, a gas venting experiment was carried out. Numerical simulation and experimental research were used to analyze propagation process of explosive blast in system, and variation characteristics of blast and flame size of six groups of gas at different volume fraction were explored. The results show that propagation of explosion shock wave in pipeline is in the form of multiple overpressure, and its peak overpressure gradually decreases. Additionally, peak overpressure and its rising rate in explosion cavity have the same change trend, and both reach maximum when gas volume fraction is 9.5%. At the same position in 90°elbows, peak overpressure rising rate generated by different volume fractions of gas is in a sawtooth shape. When it is 5.8%-11.0%, flame size varies in a sawtooth shape along with propagation distance. When at 5.8% and 6.5%, flame is extinguished before 90°. When between 5.8% and 11%, peak overpressure and flame size are significantly attenuated after pipe is bent at 90°

Key words: gas volume fraction, 90° elbow, shock wave, flame size, venting features, numerical simulation

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