基于正交试验的隧道水幕排烟系统优化研究

Research on Optimization of Water Curtain Smoke Exhaust System Based on Orthogonal Test Tunnel

为了探究水幕排烟系统对隧道火蔓延的抑制规律,并对其参数进行优化。研究采用正交试验的方法,选取水幕流量、液滴粒径、排烟风量、风速为试验因素,设计三水平四因素正交实验方案。利用FDS对隧道火灾进行数值模拟,得到各因素对排烟效果的影响次序及最优组合。结果表明,液滴粒径对隧道火灾温度和能见度影响最大,排烟风量对隧道火灾中CO浓度影响最大。最优参数组合为水幕流量160L/min、液滴粒径200μm、排烟风量26m^(3)/s、风速6 m/s。此时,排烟效果明显提高,隧道火灾烟气的蔓延能够得到有效抑制。

To explore the suppression effect of the water curtain smoke exhaust system on tunnel fire spread and to optimize its parameters,the orthogonal experimental method was employed in this article and water curtain flow rate,dropletparticle size,smoke exhaust volume,and wind speed were selected as the experimental factors to design a three-level,four-factor orthogonal test plan.FDS was utilized to numerically simulate the tunnel fire,and the sequence and optimal combination of the influences of various factors on the smoke exhaust efficacy were determined.The findings indicate that the droplet particle size exerts the most significant impact on the temperature and visibility within a tunnel fire,whereas the volume of exhaust air has the strongest effect on CO concentration during a tunnel fire.The optimal parameter combination is water curtain flow rate 160 L/min,droplet particle size 200μm,smoke exhaust air volume 26 m^(3)/s,and wind speed 6 m/s.The smoke exhaust efficiency is substantially enhanced,effectively curbing the spread of smoke from tunnel fires.