CAJ | 학술논문

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.
채용대와모의방법수치모의료장애물후지화여수분림적상호작용문제,연구목적시탐토수분림대장애물후지화적공제화억제적유효성,이급장애물대류동특성화온도장적영향.문중채용저마혁수근사하삼유가압축려파형식적Navier-Stokes방정화조분방정진행유한차분수치구해,연소과정중소산생적열석방채용휴대연소반응열적Lagrangian입자(열원모형)래모의.문중수치모의료풍동내장애물후열원산생적열기류급기여수분림적상호작용,병탐토료재유무수분림정황하적온도장화속도장특성,이급분수장치위치대온도장적영향.
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 threedimensional 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 eject 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.