瓦斯爆炸压力与波前瞬态流速演化特征及其定量关系

发布时间：2019-01-22 13:50

【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。
[Abstract]:In order to establish the quantitative relationship between transient velocity and overpressure in front of explosion wave, the characteristics of gas explosion overpressure and transient velocity propagation in an open square tube were studied by numerical simulation. The results show that the number of waveforms of wavefront transient velocity and overpressure is different in an open square tube, and the peak value of overpressure always appears before Yu Bo. In most cases, the larger the cross section side length of square tube is, the smaller the overpressure peak is and the lower the overpressure peak value is along the propagating direction. The wave front transient velocity peak increases continuously along the propagation direction, and the larger the cross section side length of the square tube is, the smaller the peak value is. When the ratio of length to diameter (the ratio of square tube length to cross section side length) is less than 125, the quantitative relationship between the peak value of overpressure and the peak value of transient velocity in front of the wave always shows a linear inverse relationship. The quantitative relationship between the peak of overpressure and the peak of wave front transient velocity is piecewise when it is greater than or equal to 125. The results can provide basic data for the study of blast wave dust.
【作者单位】：中国矿业大学安全工程学院;煤炭资源与安全开采国家重点实验室;安徽理工大学;龙岩学院;
【基金】：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)
【分类号】：O389;TD712.7

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