{"title":"基于PIV的不同约束形式火羽流场特征","authors":"Zhang Wei, Z. Ying, Liu Changwei, Yuan Dachao","doi":"10.16265/J.CNKI.ISSN1003-3033.2020.06.020","DOIUrl":null,"url":null,"abstract":"In order to explore effects of different restricted forms on flow field of fire plumeꎬ fine thermocouple and PIV technologies were used to monitor fire plume's heightꎬ temperature and flow field of diffusion burner in free spaceꎬ side wall space and corner spaceꎬ and then flow field characteristics in different restricted forms were studied. The experimental results show that when dimensionless source power Q is less than 1 5ꎬ dimensionless flame height Lf / D increases linearly which will become steady approximately when Q exceeds 1 5. Lateral velocity in different restricted spaces all conform to approximate Gaussian distributionsꎬ and sidewall space and corner space cause a certain deviation of flame center. Vortex diameter is between 3 5 and 8 cm at Q is 1 982ꎬ and its size gradually increase along with increase of side wall surface because vortex will fall offꎬ which will release a lot of heat in a short time and exerts a stretching impact on fire plume. As a resultꎬ combustion reaction of fire is promotedꎬ and then a larger vortex is generated.","PeriodicalId":9976,"journal":{"name":"中国安全科学学报","volume":"19 1","pages":"135"},"PeriodicalIF":0.0000,"publicationDate":"2020-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Flow field characteristics of fire plume in different restricted forms based on PIV\",\"authors\":\"Zhang Wei, Z. Ying, Liu Changwei, Yuan Dachao\",\"doi\":\"10.16265/J.CNKI.ISSN1003-3033.2020.06.020\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In order to explore effects of different restricted forms on flow field of fire plumeꎬ fine thermocouple and PIV technologies were used to monitor fire plume's heightꎬ temperature and flow field of diffusion burner in free spaceꎬ side wall space and corner spaceꎬ and then flow field characteristics in different restricted forms were studied. The experimental results show that when dimensionless source power Q is less than 1 5ꎬ dimensionless flame height Lf / D increases linearly which will become steady approximately when Q exceeds 1 5. Lateral velocity in different restricted spaces all conform to approximate Gaussian distributionsꎬ and sidewall space and corner space cause a certain deviation of flame center. Vortex diameter is between 3 5 and 8 cm at Q is 1 982ꎬ and its size gradually increase along with increase of side wall surface because vortex will fall offꎬ which will release a lot of heat in a short time and exerts a stretching impact on fire plume. As a resultꎬ combustion reaction of fire is promotedꎬ and then a larger vortex is generated.\",\"PeriodicalId\":9976,\"journal\":{\"name\":\"中国安全科学学报\",\"volume\":\"19 1\",\"pages\":\"135\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2020-06-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"中国安全科学学报\",\"FirstCategoryId\":\"1089\",\"ListUrlMain\":\"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.020\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"中国安全科学学报","FirstCategoryId":"1089","ListUrlMain":"https://doi.org/10.16265/J.CNKI.ISSN1003-3033.2020.06.020","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Flow field characteristics of fire plume in different restricted forms based on PIV
In order to explore effects of different restricted forms on flow field of fire plumeꎬ fine thermocouple and PIV technologies were used to monitor fire plume's heightꎬ temperature and flow field of diffusion burner in free spaceꎬ side wall space and corner spaceꎬ and then flow field characteristics in different restricted forms were studied. The experimental results show that when dimensionless source power Q is less than 1 5ꎬ dimensionless flame height Lf / D increases linearly which will become steady approximately when Q exceeds 1 5. Lateral velocity in different restricted spaces all conform to approximate Gaussian distributionsꎬ and sidewall space and corner space cause a certain deviation of flame center. Vortex diameter is between 3 5 and 8 cm at Q is 1 982ꎬ and its size gradually increase along with increase of side wall surface because vortex will fall offꎬ which will release a lot of heat in a short time and exerts a stretching impact on fire plume. As a resultꎬ combustion reaction of fire is promotedꎬ and then a larger vortex is generated.
期刊介绍：
China Safety Science Journal is administered by China Association for Science and Technology and sponsored by China Occupational Safety and Health Association (formerly China Society of Science and Technology for Labor Protection). It was first published on January 20, 1991 and was approved for public distribution at home and abroad.
China Safety Science Journal (CN 11-2865/X ISSN 1003-3033 CODEN ZAKXAM) is a monthly magazine, 12 issues a year, large 16 folo, the domestic price of each book is 40.00 yuan, the annual price is 480.00 yuan. Mailing code 82-454.
Honors:
Scopus database includes journals in the field of safety science of high-quality scientific journals classification catalog T1 level
National Chinese core journals China Science and technology core journals CSCD journals
The United States "Chemical Abstracts" search included the United States "Cambridge Scientific Abstracts: Materials Information" search included
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