公路隧道相向射流与竖井自然排烟组合烟气控制研究

Study on fire smoke control in combination mode of opposite jet and shaft exhaust in highway tunnel

通过开展相似试验,研究在相向射流与竖井自然排烟组合模式下,火源位置、风速和火源功率对烟气控制段长度的影响。试验考虑了3种组况,53种工况,通过改变火源位置、风速和火源功率,分析讨论了不同工况下火源烟气控制段长度。试验表明,增加上游(距离火源更近端)风速,会导致上游烟气控制段减少;增加下游(距离火源更远端)的风速,烟气控制段长度会受到火源功率、火源位置等多种因素的耦合作用。增大火源功率会增加烟气热浮力,使下游机械风对烟气的影响减弱。

By carrying out similar experiments,the influence of fire source location,wind speed and HRR on smoke control section length was studied under the combined mode of opposite jet and vertical shaft natural smoke exhaust.By changing the position,wind speed and HRR,three groups including 53 senarios were set and the influence of three factors on the length of smoke control section under different working conditions was analyzed and discussed.The results show that increasing the wind speed in the upstream(closer to the fire source)will reduce the smoke control section in the upstream.Increase the wind speed of the downstream(farther from the fire source),and the length of the smoke control section will also be affected by the coupling effect of fire source power,fire source location and other factors.Increasing the power of fire source will increase the thermal buoyancy of flue gas,so that the influence of downstream mechanical wind on flue gas will be weakened.