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首页> 外文期刊>Tunnelling and underground space technology >Novel correlation to evaluate the pressure losses for different traffic jam conditions in road tunnel
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Novel correlation to evaluate the pressure losses for different traffic jam conditions in road tunnel

机译：用于评估公路隧道中不同交通拥堵状况下压力损失的新型相关性

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摘要

The main aim of the present work is to provide a novel correlation between different traffic jam conditions (Filling Traffic Tunnel) in road tunnel and pressure losses, in order to calculate the thrust required to the jet fan to induce the needed ventilation. The correlation refers to a longitudinal ventilation system of impulsive fans placed in a road tunnel with a rectangular cross section. The data necessary to build the novel correlation here proposed were obtained by means of 3-D model that was validated experimentally in previous studies. To evaluate the influence on required ventilation thrust, several traffic jam conditions and different average air velocities were considered. The proposed correlation provides pressure losses as function of FTT and average air velocity in the tunnel. The pressure losses were evaluated as difference between the thrust required by the ventilation system in empty tunnel conditions and the thrust required in traffic jam condition. The mean percentage error of the novel correlation here proposed is about of 3% respect to CFD simulation results. Furthermore, a friction factor for different FTT was provided. It allows to evaluate the pressure losses due to the traffic jam as distributed ones with an error value about of 3%.
机译：本工作的主要目的是在公路隧道中的不同交通拥堵状况（填满交通隧道）和压力损失之间提供一种新颖的关联，以便计算喷流风扇所需的推力以诱导所需的通风。相关性是指放置在具有矩形横截面的公路隧道中的脉冲风扇的纵向通风系统。此处提出的建立新型相关性所需的数据是通过3-D模型获得的，该模型在先前的研究中已通过实验验证。为了评估对所需通风推力的影响，考虑了几种交通拥堵情况和不同的平均风速。所提出的相关性提供了压力损失，该压力损失是FTT和隧道中平均空气速度的函数。将压力损失评估为空洞条件下通风系统所需的推力与交通堵塞条件下所需的推力之差。相对于CFD模拟结果，这里提出的新型相关性的平均百分比误差约为3％。此外，提供了不同FTT的摩擦系数。它允许将交通拥堵造成的压力损失评估为分布状态，误差值约为3％。

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