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本文论述铁路隧道无帘幕吹入式通风的计算方法,并与模型试验结果进行验证。用动量方程计算隧道风量与风道风量的比值,在计算中考虑到了风道与隧道交叉处的三通段摩擦阻力。通过模型试验探测了三通段旋涡区对摩擦阻力的影响;判明了用动量方程计算风量比的方法不仅适用于风道口位于隧道洞口附近的情况,而且适用于在隧道内任何位置的情况。 此外,根据模型试验求得的风道口静压与局部阻力系数,探讨了通风效率和风道口的合理面积。
This article discusses the calculation method of curtainless ventilation in railway tunnels and verifies with the model test results. The momentum equation is used to calculate the ratio of tunnel air volume to duct air volume. The frictional resistance of the three-way section at the intersection of air duct and tunnel is considered in the calculation. The effect of the swirl zone of the tee section on the frictional resistance was probed by the model test. It was found that the method of using the momentum equation to calculate the air volume ratio is not only applicable to the case where the air duct is located near the tunnel entrance, but also applicable to any position in the tunnel. In addition, according to the static pressure and local drag coefficient of the wind tunnel obtained from the model test, the ventilation efficiency and the reasonable area of the wind tunnel are discussed.