【作者】 王英；

【导师】 彭世尼；

【作者基本信息】 重庆大学 ， 供热、供燃气、通风及空调工程， 2007， 硕士

【摘要】 近年来,随着环保要求的提高及生活条件的改善,气体燃料,如人工煤气、液化气、天然气等逐渐成为城市居民生活燃料的主体,同时在工业领域的应用范围也在不断扩大。气体燃料的特点是易泄漏和易燃易爆,当这些可燃气体在室内有限空间内发生泄漏后,就会增加火灾和爆炸发生的危险性。同时,由于燃料的比重不同于空气,以及门窗等有限通风条件的存在,导致室内燃料浓度分布是一个非均匀的变化过程。而气体燃料的着火与爆炸的发生是有一定的浓度界线的,在这一非均匀的燃料浓度场中,可燃区域是有限的。因此,系统地研究室内燃气泄漏的扩散过程与发展、可燃区域的变化以及着火发生的危险性等,对防止室内火灾的发生及控制具有重要的意义。本文以普通的居民居住条件(两室两厅)为研究对象,对厨房燃气泄漏后的扩散模型进行了深入研究和比较,确定室内燃气泄漏后的扩散过程可以使用浮力修正的k-ε双方程湍流模型。通过采用PHOENICS3.5对室内燃气泄漏后的扩散状态进行模拟,得到了天然气和液化石油气泄漏后的室内扩散过程中在不同时间和泄漏量的条件下的浓度场分布规律,并根据模拟结果分析了燃气泄漏后室内存在爆炸浓度范围的区域和厨房达到爆炸浓度范围的泄漏条件以及可能的后果。更多还原

【Abstract】 In recent years, with the requirements of environmental protection and the improvement of living conditions, fuel gas, such as manufactured gas, LPG, natural gas and other fuels gradually become the main fuel of the city life. Meanwhile, the application in industrial field is constantly expanding. The characteristics of the gas fuels is easy to leak, flammable and explosive. When the leak of these flammable gas in the limited indoor space occurs, it will increase the risk of fire. At the same time, as the specific gravity of fuels is different from the air and the ventilation condition is limited indoors, the concentrations distribution in the room is a non-uniform change process. While the fire and explosion occurs under a certain concentration limit. The combustible region is limited in the non-uniformity fuel concentration. Therefore ,to prevent and control the occurrence of indoor fires , it is of great significance to systematically study the leakage process and proliferation of indoor gas , the spread of combustible region and the risk of fire.In this paper,the actual living environment of the residents(two rooms and two halls) is regarded as the research object. After comparision and analysis the diffusion models, determine to use the k-εdouble-equation turbulence model which modified by buoyancy. Then, using PHOENICS3.5 to simulate diffusion process of the indoor gas leakage to complete the diffusion process simulation of both the natural gas and LPG. Finally, analyze the consequences including the region of explosion concentration and the leakage conditions of the explosion concentration region .更多还原