复杂条件下受限空间瓦斯煤尘爆炸耦合机理及伤害模型研究

Many domestic and international scholars carried on a great deal of research on gas explosion, coal dust explosion, explosion characteristics, explosion shock wave propagation and damage etc. To study the formation and motion rules of coal dust cloud and obtain a coal dust cloud . Based on the original experiment this subject will start with coal dust and gas explosion characteristics of the coupling coexistence, gas, dust ignition theory and explosion process, which based on the experimental study, theoretical analysis and numerical simulation; according to the similarity criterion, in order to study the characteristics of coal dust explosion in confined space under complex conditions, tunnels with different shape (circle, trapezoid, arch, etc.), different size and many other types of devices will be developed to simulate the roadway which serve the experiment of gas and coal dust explosion; carrying out experimental study under different combinations of gas-solid coupling, analyzing the influence of explosion criticality of gas-solid coupling with different gas and coal dust concentration, studying the change rules of explosion criticality of gas-solid coupling ,then reaching the mechanism and characteristics of gas and coal dust coupling explosion; studying the shock wave and flame and toxic gas propagation law after the gas and coal dust coupling explosion under the different conditions, analyzing the propagation law of explosion with the changing of particle size of coal dust, concentration of coal dust and concentration of gas. Severity model of gas and coal and dust coupling explosion is obtained ,accident damage three zone of gas and coal and dust coupling explosion is established. Results has important theoretical research value and practical guiding significance to prevent the occurrence of coal mine accidents and emergency rescue work.

国内外在瓦斯和煤尘爆炸实验以及爆炸特性和爆炸冲击波传播伤害等方面做了大量研究。本课题采用试验研究、理论分析和数值模拟，从气体、粉尘点火理论和爆炸过程入手，在原有实验基础上依照相似准则，改造模拟不同巷道形状（圆形、梯形、拱形等）、不同巷道尺寸等多种类型的瓦斯煤尘爆炸实验系统，分析研究煤尘云形成及运动规律，研究复杂条件下受限空间煤尘与瓦斯共存爆炸耦合机理，开展不同组合条件下的气固耦合爆炸实验研究，研究瓦斯煤尘气固爆炸耦合临界值的变化规律；研究不同条件下瓦斯煤尘爆炸耦合冲击波、火焰、有毒气体传播规律，研究不同瓦斯浓度、不同煤尘粒径条件下的爆炸传播特性；建立瓦斯煤尘爆炸事故严重度模型；确立瓦斯煤尘爆炸耦合事故伤害“三区”。研究成果对防止煤矿重大事故发生及应急救援工作有重要价值。

目前国内外学者在瓦斯和煤尘爆炸实验以及爆炸特性和爆炸冲击波传播伤害等方面做了大量研究。本课题基于试验研究、理论分析和数值模拟，从气体、粉尘点火理论和爆炸过程入手，在原有实验基础上依照相似准则，搭建和模拟了不同巷道形状（圆形、梯形、拱形等）、不同巷道尺寸等多种类型的瓦斯煤尘爆炸实验平台，通过分析煤尘云形成及运动规律，得出复杂条件下受限空间煤尘与瓦斯共存爆炸耦合机理，课题进行了不同工况下的瓦斯煤尘爆炸耦合实验，研究得出了瓦斯煤尘气固爆炸耦合临界值的变化规律；在不同试验管道条件下进行了瓦斯煤尘爆炸试验，得出爆炸冲击波、火焰、有毒气体传播规律，在实验平台进行不同浓度、不同粒径的瓦斯煤尘爆炸试验，得出爆炸压力以及火焰的传播特性；通过对试验以及模拟得出的爆炸传播规律分析，建立瓦斯煤尘爆炸事故严重度模型；确立了瓦斯煤尘耦合爆炸事故伤害“三区”。研究成果对对防止煤矿重大事故发生以及应急救援工作有重要价值。