湍流模型影响狭长空间内火灾烟气运动的数值研究

Numerical study about the influence of turbulence model on the movement of fire smoke in a tunnel space

为准确地预测狭长空间内火灾引起的烟气运动,本文研究了不同湍流模型的影响。针对某一巷道内的火灾烟气运动,分别采用考虑浮力修正的双方程湍流模型和大涡模拟方法展开计算。计算结果表明大涡模拟方法的预测值与测量值吻合较好,普通的双方程湍流模型虽然进行了浮升力的修正,但计算结果与实验值仍然存在着一定的差距。

For accurately predicting smoke movement induced by fire in a tunnel,the influence of different turbulence models is investigated in the paper.Computational studies are conducted for simulating smoke movement by using k-εturbulence model and LES model.Computational results show that the results from LES model agree well with test data,and the prediction from k-εturbulence model which the effect of buoyancy on the smoke movement is considered still has some difference with test data.