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临界风速是隧道火灾紧急通风系统设计的一个重要参数。在坡度隧道中,由于火风压的作用,临界风速与水平隧道临界风速相比会有一定的差异。下坡隧道临界风速会稍大于水平隧道的临界风速。本文对坡度在0～10%范围变化的隧道进行了大量的CFD模拟计算,从模拟结果中得到了临界风速的通用坡度修正公式。
Critical wind speed is an important parameter in the design of tunnel fire emergency ventilation system. In sloped tunnels, there is a certain difference between the critical wind speed and the critical wind speed of horizontal tunnel due to the effect of fire pressure. The critical wind speed of a downhill tunnel is slightly larger than the critical wind speed of a horizontal tunnel. In this paper, a large number of CFD simulations have been carried out for tunnels with gradient ranging from 0% to 10%. A general gradient correction formula for critical wind speed has been obtained from the simulation results.