| 傅长亮,刘难生,陆夕云,廖光煊.障碍物后池火与水喷淋相互作用的数值模拟[J].火灾科学,2003,12(3):121-129. |
| 障碍物后池火与水喷淋相互作用的数值模拟 |
| Numerical Simulation of the Interaction between Pool Fire behind an Obstruction and Water Spray |
| 投稿时间：2003-06-02 修订日期：2003-06-23 |
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| DOI：10.3969/j.issn.1004-5309.年.期.顺序 |
| 基金项目: |
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| 中文关键词: 灭火 水喷淋 数值模拟 大涡模拟 亚格子模型 |
| 英文关键词:fire suppression water spray water sprinkler numerical simulation large eddy simulation (LES) subgrid scale (SGS) model |
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| 中文摘要: |
| 采用大涡模拟方法数值模拟了障碍物后池火与水喷淋的相互作用问题,研究目的是探讨水喷淋对障碍物后池火的控制和抑制的有效性,以及障碍物对流动特性和温度场的影响。文中采用低马赫数近似下三维可压缩滤波形式的Navier Stokes方程和组分方程进行有限差分数值求解,燃烧过程中所产生的热释放采用携带燃烧反应热的Lagrangian粒子(热元模型)来模拟。文中数值模拟了风洞内障碍物后热源产生的热气流及其与水喷淋的相互作用,并探讨了在有无水喷淋情况下的温度场和速度场特性,以及喷水装置位置对温度场的影响。 |
| 英文摘要: |
| The interaction between an isolated pool fire behind an obstruction and water spray is investigated by large eddy simulation (LES) approach. The object of this study is to deal with the effect of water spray on the development of pool fire behind an obstruction and to examine the influence of existence of the obstruction on the flow and temperature fields. The filtered three dimensional compressible Navier Stokes equations under low Mach number approximation and the filtered species equations are solved by finite difference method. The fire is approximately modeled by thermal elements that are ejected from fire and release heat at a specified rate. In this study, an isolated pool fire behind an obstruction in a rectangular tunnel with an incoming flow (or wind) is used as a physical model problem and calculated by LES technique. In the upstream of the isolated pool fire, water sprinkler is set on the top wall of the tunnel to ej!ect water spray. Some typical results, including the temperature and velocity fields with and without water spray, and the influence of the location of the sprinkler on the temperature variation, are discussed. |
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