Flow field characteristics of fire plume in different restricted forms based on PIV

中国安全科学学报 Pub Date : 2020-06-28 DOI:10.16265/J.CNKI.ISSN1003-3033.2020.06.020

Zhang Wei, Z. Ying, Liu Changwei, Yuan Dachao

引用次数: 1

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.

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基于PIV的不同约束形式火羽流场特征

为了探讨不同限制形式对火羽流场的影响ꎬ采用细热电偶和PIV技术对火羽高度ꎬ扩散燃烧器自由空间ꎬ侧壁空间和转角空间温度和流场进行了监测，研究了不同限制形式下的流场特征。实验结果表明，当无量纲源功率Q小于1􀆰5ꎬ时，无量纲火焰高度Lf / D呈线性增长，当Q大于1􀆰5时趋于稳定。不同受限空间的横向速度均符合近似高斯分布ꎬ，侧壁空间和角空间使火焰中心产生一定的偏差。在Q = 1􀆰982ꎬ时，涡直径在3􀆰5 ~ 8 cm之间，随着侧壁面积的增加，涡的尺寸逐渐增大，因为涡会脱落ꎬ，在短时间内释放大量热量，对火羽产生拉伸作用。这就促进了ꎬ火的燃烧反应ꎬ，从而产生了更大的涡流。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

中国安全科学学报

CiteScore

1.30

自引率

0.00%

发文量

8733

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