基于欧拉-拉格朗日法的细水雾消烟模型研究

Smoke Suppression Model of Water Mist Based on Euler-Lagrangian Method

细水雾水幕在隧道火灾中具有较好的控烟阻烟作用,针对目前细水雾阻烟数值模拟研究中并未考虑细水雾的捕集沉降作用,依据气溶胶动力学原理,考虑细水雾的惯性碰撞、拦截效应和扩散效应捕集机理,基于欧拉-拉格朗日方法构建细水雾降温消烟模型,并对狭长通道内细水雾降温消烟实验进行模拟仿真,结果表明:模拟结果与实验高度吻合,能见度稳定在9 m左右,消烟模型对细水雾降温效果的影响较小,但在消烟过程中起到关键作用,不考虑消烟模型时,能见度仅为5 m,模拟值低于实验值约45%,表明该模型能够有效表征细水雾对烟气的降温、阻隔和消烟作用.

The water mist curtain has a good smoke control and suppression effect in tunnel fires. The current numerical simulation of water mist smoke suppression fails to consider the trapping and sedimentation effect of water mist. In this paper,based on the principle of aerosol dynamics and the Euler-Lagrangian method,the water mist cooling and smoke elimination model is constructed,with the inertial collision of water mist and the capture mechanism of interception effect and diffusion effect taken into consideration. The experiment on water mist cooling and smoke resistance in the narrow channel is simulated,and the results show that the simulation results are highly consistent with the experimental ones and the visibility is stable at about 9 m. The smoke suppression model has little effect on the cooling effect of water mist,but it plays a key role in the smoke suppression process. When the smoke suppression model is not considered,the simulated value of visibility is only 5 m,about 45% lower than the experimental value,which shows that the model can effectively characterize the cooling,blocking and smoke suppression effects of water mist on smoke.