【作者】 李振峰；

【导师】 余明高；

【作者基本信息】 河南理工大学 ， 安全技术及工程， 2009， 硕士

【摘要】 传统的哈龙灭火技术会产生温室效应、严重破坏臭氧层以及污染环境,而细水雾具有高效、无环境污染和能有效降低烟气毒害等优点,近年来已成为国际消防界研究的热点。考虑到细水雾在实际消防工程中的推广,本论文应用实验研究和数值模拟相结合的方法,开展了障碍物条件下细水雾灭火有效性的实验和模拟研究。定性分析了细水雾的灭火参数。基于流体力学守恒方程,建立了受限空间内部的能量产生、转移和损失模型,并给出了各种能量的计算方法。这些模型的建立,为下面章节的数值模拟提供理论依据与建模数据。自制了用于研究细水雾熄灭含网格形障碍物油火的实验平台。通过改变细水雾压力、火源与障碍物的距离、障碍物的遮盖率、以及障碍物之间的间距来研究细水雾熄灭含网格形障碍物油火特性。结果表明障碍物与火源的距离以及障碍物的遮盖率是影响灭火重要因素,得出了有效距离在油池火焰高度L的1/2处及障碍物遮盖率为10%时,细水雾熄灭油火的时间最短。同时本论文在结合实验数据的基础上,利用火灾动力学模型,进行了细水雾抑制含障碍物火焰的数值模拟。并通过局部网格加密的方法,解决了粗糙网格划分下无法识别较小尺寸障碍物的困难,以及保证了运算精度。最后结合实验现象应用数值模拟结果,分析了实验中细水雾能有效熄灭障碍物油火的原因。更多还原

【Abstract】 Traditional Halon fire-fighting technology will have a greenhouse effect and damage the ozone layer Seriously as well as the pollution of the environment but the Water mist have the advantages of the highly efficient and environmentally, as well as reducing gas poisoning effectively. In recent years, it has become a hot spot studied. The scene of the fire complex environment and the existence of obstacles make it more difficult to fire. Considered the promotion prospects of the water mist in the actual fire protection engineering, used a combination methods of experimental research and numerical simulation. It was carried out simulation and experimental study on the conditions of obstacles water mist fire-fighting effectiveness.Based on the Conservation equations of fluid mechanics, established the model of the internal energy generation, transfer, loss for the limited space and gave each energy computational method. I analysis each mechanism of the water mist in fire extinguishing, gave the best parameters in quota.Then set up a fire-fighting platform for experiments and data acquisition system using for research the inhibition the water mist of liquid barrier with the flame. It was carried out the experiment of water mist putting out the Kerosene fire with barrier under different working conditions by changing the pressure water mist and the distance of the fire source and the barrier, obstacle hiding rare, the distance between grid shape obstacles. The results showed that the source of the fire barrier and the distance between the barrier and the cover was an important factor, range in more than 400mm and cover rate of 10% the time of the Water mist extinguishing oil fires is the shortest.Using fire dynamics model carried out numerical simulation water mist suppress flame with obstruction. Ensure the accuracy of computing, using the local mesh refinement approach, which solute the difficult of coarse mesh can not identify the smaller size barrier. Simulation results explained the reason why the water mist fire-fighting can not be effective, experiment agree with the basic phenomenon.更多还原