羊鹿山隧道20MW火灾全射流纵向排烟全比尺试验研究

Full-Scale Experiment Study on Full-Jet Longitudinal Smoke Exhaust of 20MW Fire in Yanglushan Tunnel

为研究G50s沪渝南线高速公路羊鹿山隧道全射流纵向排烟的可行性与有效性,在不利于排烟的下坡隧道(左洞)内,以柴油和汽油为燃料进行油盘火烧,开展了20MW火灾全射流纵向排烟全比尺试验,对洞内外环境参数(洞口大气温度T、洞口大气压P、相对湿度φ)、隧道内沿程风速及排烟时间等进行了测试。研究表明:全比尺火灾试验期间,羊鹿山隧道左洞内自然风速vn≈1.0~1.6 m/s,与排烟方向相反,表现为排烟阻力;隧道内开启6组射流风机时,下坡隧道内沿程纵向风速vi≈3.5 m/s,隧道内开启12~15组风机时,下坡隧道内沿程纵向风速vi≈5.5~7.0 m/s;从点火开始到隧道内烟气全部排出洞外的时间大约为30 min。对于羊鹿山隧道,采用全射流纵向排烟是可行的。

In order to study the feasibility and effectiveness of full-jet longitudinal smoke exhaust of the Yanglushan tunnel on the G50s Shanghai-Chongqing south expressway,the full-scale 20 MW fire test for full-jet longitudinal smoke exhaust was carried out in the left tunnel of Yanglushan tunnel,which was a downhill tunnel that was not conducive to smoke exhaustion.Fuels used in the oil pan fire test were diesel and gasoline.The environment parameters inside and outside the tunnel such as temperature T,atmospheric pressure P at the tunnel portal,and humidity of atmosphereφwere tested.Meanwhile,the wind speed along the tunnel and the smoke exhaust time were also tested.The results show that:the natural wind velocity vn in the left tunnel of the Yanglushan tunnel is 1.0~1.6 m/s during the full-scale fire test,and the wind direction is opposite to the direction of smoke exhaust,which is a resistance for smoke exhaust.When 6 groups of jet fans are opened in the tunnel,the longitudinal wind velocity vi is 3.5 m/s along the downhill tunnel;when 12~15 groups of fans are opened in the tunnel,the longitudinal wind velocity vi is 5.5~7.0 m/s in the downhill tunnel.It takes about 30 minutes from the start of ignition to the time when all smoke in the tunnel is discharged out of the tunnel.Therefore,it is feasible to use the full-jet longitudinal exhaust in the Yanglushan tunnel.