{"title":"开放空间预混甲烷-空气云与建筑物的爆燃效应","authors":"Jiashuai Wang, , , Xu Wang, , , Shengzhu Zhang*, , , Yuntao Li, , , Jie Zhang, , , Dengfeng Zheng, , and , Yanan You, ","doi":"10.1021/acs.chas.5c00115","DOIUrl":null,"url":null,"abstract":"<p >To investigate methane-premixed gas cloud deflagration consequences, we developed a computational fluid dynamics (CFD) model for natural gas deflagration. Validation against large-scale pipeline explosion experiments preceded the examination of characteristic parameters of gas cloud and building presence effects on deflagration fireball thermal radiation and overpressure. Results indicate that open-space deflagration yields increasing external overpressure with equivalence ratios below 1.4; identical-area circular clouds exhibit 10% higher thermal radiation growth rates and greater overpressure increases than square counterparts; nonuniform gas distribution reduces thermal radiation (magnitude dependent on heterogeneity); frontal radiation exceeds lethal limits within 150 m of leakage points; buildings confer significant shielding, establishing safety beyond 200 m; increased building height accelerates surface thermal attenuation; rooftops occupy thermal decay transition zones where attenuation rates intensify with height.</p>","PeriodicalId":73648,"journal":{"name":"Journal of chemical health & safety","volume":"32 5","pages":"649–661"},"PeriodicalIF":3.4000,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Deflagration Effects of Premixed Methane–Air Cloud with Buildings in Open Space\",\"authors\":\"Jiashuai Wang, , , Xu Wang, , , Shengzhu Zhang*, , , Yuntao Li, , , Jie Zhang, , , Dengfeng Zheng, , and , Yanan You, \",\"doi\":\"10.1021/acs.chas.5c00115\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >To investigate methane-premixed gas cloud deflagration consequences, we developed a computational fluid dynamics (CFD) model for natural gas deflagration. Validation against large-scale pipeline explosion experiments preceded the examination of characteristic parameters of gas cloud and building presence effects on deflagration fireball thermal radiation and overpressure. Results indicate that open-space deflagration yields increasing external overpressure with equivalence ratios below 1.4; identical-area circular clouds exhibit 10% higher thermal radiation growth rates and greater overpressure increases than square counterparts; nonuniform gas distribution reduces thermal radiation (magnitude dependent on heterogeneity); frontal radiation exceeds lethal limits within 150 m of leakage points; buildings confer significant shielding, establishing safety beyond 200 m; increased building height accelerates surface thermal attenuation; rooftops occupy thermal decay transition zones where attenuation rates intensify with height.</p>\",\"PeriodicalId\":73648,\"journal\":{\"name\":\"Journal of chemical health & safety\",\"volume\":\"32 5\",\"pages\":\"649–661\"},\"PeriodicalIF\":3.4000,\"publicationDate\":\"2025-09-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of chemical health & safety\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.chas.5c00115\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of chemical health & safety","FirstCategoryId":"1085","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.chas.5c00115","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
The Deflagration Effects of Premixed Methane–Air Cloud with Buildings in Open Space
To investigate methane-premixed gas cloud deflagration consequences, we developed a computational fluid dynamics (CFD) model for natural gas deflagration. Validation against large-scale pipeline explosion experiments preceded the examination of characteristic parameters of gas cloud and building presence effects on deflagration fireball thermal radiation and overpressure. Results indicate that open-space deflagration yields increasing external overpressure with equivalence ratios below 1.4; identical-area circular clouds exhibit 10% higher thermal radiation growth rates and greater overpressure increases than square counterparts; nonuniform gas distribution reduces thermal radiation (magnitude dependent on heterogeneity); frontal radiation exceeds lethal limits within 150 m of leakage points; buildings confer significant shielding, establishing safety beyond 200 m; increased building height accelerates surface thermal attenuation; rooftops occupy thermal decay transition zones where attenuation rates intensify with height.