燃气管道泄漏扩散模型及数值模拟

. 精选范本城镇燃气管道泄漏扩散模型及数值模拟韩克顺天津城市建设学院天津摘要: 城镇燃气管道的分布区域人口及建筑众多,燃气管道一旦发生泄漏,将有可能造成重大的财产损失甚至人员伤亡。因此,为了量化城镇燃气泄露危害,针对管道不同的破坏情况及气源建立了燃气泄漏各种源模型以及扩散模型,并且建立了燃气管线动态泄漏扩散模型及伤害性危险范围。对第三方破坏所造成的城镇燃气管道泄漏模型进行了模拟 ,采用 CFD 技术对管道泄漏燃气的扩散进行模拟研究,获得了泄漏气体的扩散数值模拟结果 ,为城镇燃气管道安全运行提供了理论依据。关键词 :燃气管道 ; 泄漏 ; 泄漏模型 ; 扩散模型 ; 数值模拟Abstract: The areas that city gas pipelines distributed in always crowd with people and buildings, and once gas releases through damaged pipes, accidents would happen involving substantial economic losses and even victims amongst the population. Therefore, in order to quantify the hazards of city gas leak, different leakage and diffusion models were established according the characters of gas and the damage. The diffusion model of unsteady leakage of gas pipeline and the damaging and destroying areas were established. Based on the computational fluid dynamics (CFD) technique the diffusion range of leaked gas during accident of underground gas pipeline that caused by the third party damage was studied. According to the results, the dispersion of the leaked gas was obtained and providing the theory basis for safety operation of city gas pipelines.Key words: Gas pipelines; Leakage; Leakage model; Diffusion model; Numerical simulation由于管道老化、腐蚀、管材和焊缝缺陷等原因,尤其是随着市政建设的发展,城镇内违章施工挖断、压裂燃气管道的事故屡见不鲜,泄漏事故频发 ,引发火灾及爆炸事故,造成人员伤亡及环境污染的恶劣后果。燃气管道泄漏扩散的危险性主要在于两个方面:一是一定区域内燃气浓度达到阈限值,使人员中毒 ;二是一定区域内燃气浓度达到爆炸极限,范围内发生火灾或爆炸事故。针对这种情况,本文根据...