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Numerical study on water curtain system for fire evacuation in a long and narrow tunnel under construction

机译：在建窄长隧道疏散水幕系统的数值研究

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摘要

Numerical simulations are carried out to study the water curtain systems for fire evacuation in a long and narrow water tunnel under construction by shield tunnelling machine (STM). The designed fire is located near the working face with a heat release rate of 40 MW. In numerical simulations, the grid resolution is analyzed. The temperature, soot density, species concentration and visibility at different cross sections with different water curtain conditions are studied. The water curtain can partially prevent the smoke from spreading outside, and cool the smoke outside evidently for a better evacuation. It can appreciably decrease the carbon dioxide concentration and increase the oxygen concentration outside the water curtain. However, the water curtain will largely increase the soot density and decrease the visibility at the lower part of the water tunnel. The droplet from the water curtain will put impact on the flow and make a turbulent flow nearby.
机译：通过数值模拟研究了盾构隧道掘进机（STM）在建的长而窄的水隧道中用于疏散火灾的水幕系统。设计的火炉位于工作面附近，放热率为40 MW。在数值模拟中，分析了网格分辨率。研究了不同水幕条件下不同截面的温度，烟so密度，物种浓度和能见度。水幕可以部分地防止烟雾扩散到外部，并明显地将烟雾冷却到外部，以更好地疏散。它可以明显降低水帘外的二氧化碳浓度并增加氧气浓度。但是，水幕将大大增加烟灰的密度，并降低水道下部的可见性。水幕上的水滴会影响水流，并在附近产生湍流。

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