管道内甲烷爆炸火焰传播特性的实验与数值模拟研究

发布时间：2018-06-04 19:46

  本文选题：甲烷爆炸 + 火焰传播特性　； 参考：《西安科技大学》2015年硕士论文

【摘要】：在工业生产和生活中甲烷爆炸是一种主要灾害形式,而且爆炸事故一旦发生将难以控制。故研究管道内甲烷爆炸火焰传播特性,能为预防管道及受限空间内甲烷爆炸事故的发生提供基础研究。本文运用可视化火焰传播实验系统,在长80mm×宽80mm×高600mm的竖直小尺寸爆炸燃烧管道内对不同浓度甲烷爆炸火焰传播特性进行了实验研究;利用Matlab软件的图像处理功能,对实验拍摄的火焰传播图片进行分析得到了火焰传播速度;利用专业气体爆炸模拟软件FLACS,数值模拟了不同泄爆条件下甲烷爆炸火焰传播特性。结果表明,此爆炸燃烧管道内甲烷爆炸范围为5.5%-15.5%,爆炸感应期随着甲烷浓度的增加而缩短;浓度为9%-11%的甲烷爆炸火焰在竖直管道内传播过程中,形成典型的“tulip”火焰;爆炸火焰传播速度在爆炸初期先上升至峰值后迅速下降,之后随着火焰的传播,火焰速度不断震荡;各浓度甲烷爆炸火焰传播速度峰值在浓度为10%时达到最大值为35m/s,且随甲烷浓度的增加先增大后减小;爆炸火焰压力和火焰温度传播过程先增大到压力峰值后由于泄爆作用恢复至常压常温;甲烷爆炸压力峰值和火焰温度峰值都在浓度为10%时达到最大,且随着甲烷浓度的增加先增大后减小;甲烷爆炸最大压力值为0.498Mpa,甲烷爆炸最高火焰温度为1690℃;基于FLACS软件的数值模拟结果,其爆炸压力、火焰温度和火焰传播速度的变化趋势与实验结果吻合;不同泄爆条件下甲烷爆炸火焰数值模拟结果表明,在甲烷浓度为10%时,泄爆口打开条件下甲烷爆炸火焰传播过程中没有形成“Tulip”火焰;泄爆口泄爆程度越大各浓度甲烷爆炸压力越小、爆炸火焰温度越低、爆炸火焰传播速度越快,即T泄爆口密闭T泄爆口装有泄爆膜T泄爆口打开、P泄爆口密闭P泄爆口装有泄爆膜P泄爆口打开、V泄爆口密闭V泄爆口装有泄爆膜V泄爆口打开。
[Abstract]:Methane explosion is a major disaster in industrial production and daily life, and it will be difficult to control once explosion accident occurs. Therefore, studying the flame propagation characteristics of methane explosion in pipeline can provide basic research for preventing methane explosion accident in pipeline and confined space. In this paper, the flame propagation characteristics of methane explosion with different concentrations in a vertical small size explosive combustion pipe with long 80mm 脳 wide 80mm 脳 high 600mm are studied by using a visual flame propagation experimental system, and the image processing function of Matlab software is used. The flame propagation velocity is obtained by analyzing the flame propagation pictures taken in the experiment, and the flame propagation characteristics of methane explosion under different explosion conditions are numerically simulated by using the professional gas explosion simulation software FLACSs. The results show that the range of methane explosion in this explosion combustion pipeline is 5.5-15.5.The induction period of explosion shortens with the increase of methane concentration, and a typical "tulip" flame is formed during the propagation of 9- 11% methane explosion flame in vertical pipeline. The velocity of flame propagation rises to the peak at the beginning of explosion, then decreases rapidly, and then oscillates with the spread of flame. The peak value of flame propagation velocity of methane explosion reaches a maximum of 35 m / s when the concentration of methane is 10, and increases first and then decreases with the increase of methane concentration. The propagation process of explosion flame pressure and flame temperature first increases to the peak pressure and then returns to normal temperature due to the effect of explosion, and the peak value of methane explosion pressure and flame temperature reaches the maximum when the concentration is 10. With the increase of methane concentration, the maximum explosion pressure of methane is 0.498Mpaand the maximum flame temperature of methane explosion is 1690 鈩，

本文编号：1978618