温度层化环境中线羽流的流动特性

李俊梅; 张仁; 李炎锋; 赵宇航; 田洋

doi:10.11936/bjutxb2016050010

温度层化环境中线羽流的流动特性

doi: 10.11936/bjutxb2016050010

1.
北京工业大学北京城市交通协同创新中心, 北京 100124
2.
北京工业大学建筑工程学院, 北京 100124

基金项目: 北京市自然科学基金-北京市科学技术研究院联合资助项目(L140002)；国家自然科学基金资助项目(51278018,51378040)

详细信息

作者简介:
作者简介: 李俊梅(1970—), 女, 副教授, 主要从事建筑火灾安全方面的研究, E-mail:lijunmei@bjut.edu.cn

中图分类号: TU834
计量
- 文章访问数: 163
- HTML全文浏览量: 112
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2016-05-06
- 网络出版日期: 2022-09-09
- 刊出日期: 2017-01-01

Oretical Analysis on the Dynamics of Line Plume in Thermal-stratified Environment

1.
Beijing Collaborative Innovation Center for Metropolitan Transportation, Beijing University of Technology, Beijing 100124, China
2.
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 为研究层化环境对内部火灾烟气扩散的影响,以线羽流为研究对象,在正常环境下线羽流流动特性研究的基础上,通过理论分析对恒温度梯度环境中线羽流的流动特性进行了分析研究,得到线羽流的扩散半径、轴心速度、轴心密度差随高度的变化规律,线羽流所能达到的最大高度,烟气浮力发生变化的临界高度等.
- 温度层化环境 /
- 线羽流 /
- 热动力特性
Abstract: Thermal-stratified environment is often seen in atria or other large space buildings with glass roofs due to the solar radiation. In order to study the effect of the thermal-stratified environment on the smoke spread in fire cases, theoretical analysis of the thermal dynamics of the line plume in the environment with constant vertical temperature gradient was carried out based on the former research in this paper. Variations of the radius, central velocity, density difference of the line plume with height were derived, and the maximum height of the plume was obtained. The upward buoyancy due to the line source changed its direction at the height of 76% of the maximum height which the plume could rise.
- thermal-stratified environment /
- line plume /
- thermal dynamics
The authors have declared that no competing interests exist.

HTML全文

图 1 正常环境与温度层化环境中线羽流的流动特性对比

Figure 1. Comparison of thethermal dynamics of the line plume in normal environment and those in temperature-stratified environment

下载: 全尺寸图片幻灯片

参考文献(17)

[1]	LIU Y, PENG C, YAN D.Indoor environment status and energy saving design investigation of railway stations[J]. Journal of HV&AC, 2011, 41(7): 51-57. (in Chinese)
[2]	WANG J.Exploration and analysis on the lighting atrium design of the public building in hot summer and cold winter areas[D]. Hangzhou: Zhejiang University, 2010. (in Chinese)
[3]	MORGAN H P, GHOSH B K, GARRAD G.Design methodologies for smoke and heat exhaust ventilation[R]. Garston: Building Research Establishment Inc, 1999.
[4]	KLOTE J H, MILKE J A.Principles of smoke management[M]. Atlanta: American Society of Heating, Refrigerating and Air-conditioning Engineers, Inc, 2002: 182-190.
[5]	CHOW W K, LI J.On atrium smoke management system design[J]. ASHRAE Transactions, 2005, 111(1): 395-406.
[6]	National Fire Protection Association. NFPA 92: standard for smoke control systems[S]. Quincy: National Fire Protection Association, 2012.
[7]	LI J M, ZHAO D C, LI Y F, et al.Numerical studies on thermal aerodynamics of balcony spill plumes[J]. Journal of Beijing University of Technology, 2007, 33(12): 1278-1282. (in Chinese)
[8]	MORTON BRTAYLOR GITURNER JS.Turbulent gravitational convection from maintained and instantaneous sourcesProceedings of the Royal Society of London Series A19562341196123 MORTON B R, TAYLOR G I, TURNER J S.Turbulent gravitational convection from maintained and instantaneous sources[J]. Proceedings of the Royal Society of London Series A, 1956, 234(1196): 1-23.
[9]	HESKESTAD G.Note on maximum rise of fire plumes in temperature-stratified ambient[J]. Fire Safety Journal, 1989, 15: 271-276.
[10]	National Fire Protection Association. NFPA 92B: Guide for smoke management systems in malls, atria and large areas[S]. Quincy: National Fire Protection Association, 1995.
[11]	FANG J, YUAN H.Experimental measurements, integral modeling and smoke detection of early fire in thermally stratified environment[J]. Fire Safety Journal, 2007, 42: 11-24.
[12]	FANG J, JI J, YUAN H, et al.Experimental and numerical study of smoke plumes in stable thermally stratified environments[J]. Journal of Fire Sciences, 2006, 24: 177-193.
[13]	HARRISON R.Entrainment of air into thermal spill plumes[D]. Christchurch: University of Canterbury, 2009.
[14]	LOUGHEED G D, MCCARTNEY C J, GRIBBS E.Balcony spill plumes[R]. Ottawa: National Research Council Canada, 2006.
[15]	POREH M, MORGAN H P, MARSHALL N R, et al.Entrainment by two-dimensional spill plumes[J]. Fire Safety Journal, 1998, 30: 1-19.
[16]	THOMAS P H.On the upward movement of smoke and related shopping mall problems[J]. Fire Safety Journal, 1987, 12: 191-203.
[17]	LEE S L, EMMONS H W.A study of natural convection above a line fire[J]. Journal of Fluid Mechanics, 1961, 11(3): 353-368.