CFD Analysis on the Diffusion and Accumulation Characteristics of Microleakage LPG in an Integrated Stove.
CFD Analysis on the Diffusion and Accumulation Characteristics of Microleakage LPG in an Integrated Stove.
复制标题
集成灶内微泄漏液化石油气扩散和聚积特性的CFD分析
DOI：
10.1021/acsomega.2c06715
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发表时间：
2023-01-10
期刊：
影响因子：
4.1
通讯作者：
Huang, Dongmei
中科院分区：
文献类型：
--
作者：
Jin, Kan;Lin, Gaofan;Zhao, Qi;Liu, Yajing;Qiu, Jia;Jiang, Yong;Huang, Dongmei
燃气微泄漏是导致家用燃气器具内气体扩散和积聚的主要原因，是室内燃气爆炸事故的主要原因。为研究家用燃气具内微泄漏气体的扩散和积聚特性，以某集成灶为研究对象，采用计算流体力学（CFD）数值模拟方法，分析了不同泄漏率和泄漏位置对微泄漏液化石油气（LPG）在其内部扩散和积聚特性的影响。结果表明，微泄漏LPG在重力作用下呈向下扩散流动，随泄漏时间的延长，炉腔内LPG浓度普遍增加，但空间分布极不均匀。此外，危险区域的体积随着微漏LPG的不断积累而迅速变化，占据腔体体积的50%以上。不同泄漏率下的微泄漏LPG扩散和聚集过程高度相似;相反，泄漏源的位置与扩散和聚集特性密切相关。不同泄漏部位的微泄漏LPG扩散分布和聚集位置存在明显差异。通常，当泄漏源位于燃气灶挡板上方时，顶部和底部之间存在0.1-0.2%的浓度差，而当泄漏源位于燃气灶挡板下方时，顶部和底部之间存在1.0-1.3%的浓度差。此外，泄漏位置的差异对LPG浓度达到临界浓度的时间有显著影响，说明不同泄漏位置的燃烧爆炸危险性与泄漏时间高度相关。该研究可为微泄漏瓦斯爆炸事故的预防提供一定的技术支持。
Gas microleakage, which results in gas diffusion and accumulation in domestic gas appliances, is the leading cause of indoor gas explosion accidents. To research the diffusion and accumulation characteristics of microleakage gas in domestic gas appliances, this study took an integrated stove as the research object and analyzed the effects of different leakage rates and leakage locations on the diffusion and accumulation characteristics of microleakage liquefied petroleum gas (LPG) in its interior using the computational fluid dynamics (CFD) numerical simulation method. The results show that microleakage LPG is characterized by a downward diffusion flow driven by gravity and the concentration inside the integrated stove cavity generally increases with the increase of leakage time; however, the spatial distribution is extremely inhomogeneous. In addition, the volume of the dangerous area rapidly changes with the continuous accumulation of microleakage LPG, occupying more than 50% of the cavity volume. Microleakage LPG diffusion and accumulation process are highly similar under different leakage rates; on the contrary, the location of the leakage source is closely related to the diffusion and accumulation characteristics. The diffusion distribution and accumulation position of microleakage LPG at different leakage locations present obvious differences. Typically, there is a concentration difference of 0.1–0.2% between the top and the bottom when the leakage source is located above the gas stove baffle and a concentration difference of 1.0–1.3% between the top and the bottom when the leakage source is located below the gas stove baffle. In addition, the difference in the leakage location has a significant impact on the time the concentration of LPG reaches the critical concentration, which indicates that the combustion and explosion risk of different leakage locations are highly related to the leakage time. The research can provide certain technical support for microleakage gas explosion accident prevention.
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影响因子：
4.1
作者：
Liang H;Wang T;Luo Z;Wang X;Kang X;Deng J
通讯作者：
Deng J
DOI：
10.1515/eces-2017-0017
发表时间：
2017-06-01
影响因子：
1.9
作者：
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通讯作者：
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DOI：
10.1016/j.jlp.2017.01.012
发表时间：
2017-03-01
影响因子：
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作者：
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通讯作者：
Wu, Liyang
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通讯作者：
Ling, Kegang
影响因子：
7.2
作者：
Middha, Prankul;Hansen, Olav R.
通讯作者：
Hansen, Olav R.