地铁中间风井前变速运行对乘客舒适性影响

Influence of running with varying velocity in front of the middle ventilating shaft ofthe subway on passenger comfort

地铁高速通过隧道中间风井,列车车体内外都会产生较强的压力波动,严重时会影响司乘人员舒适性。采用数值计算方法对地铁列车变速通过中间风井的气动效应进行数值模拟,研究不同参数对车体表面压力分布规律,并以车内压力变化率和3 s内压力变化评价标准评估车内乘客舒适性。研究结果表明:距离中间风井100 m处变速车体表面测点压力峰峰值均大于变速位置为200 m和300 m时对应的测点压力峰峰值,分别大4.68%和6.46%。将车速120 km/h降为100 km/h,变速位置为300 m时分别比变速位置为100 m和200 m时车内压力变化少10.72%和5.07%。列车在中间风井前200 m以上减速至100 km/h以下,能明显缓解通过风井时车内压力变化,满足车内乘员舒适性要求。

When the subway passes through the ventilating shaft in the middle of the tunnel with high speed,pressure fluctuation occurs inside and outside the train body,which affects the comfort of drivers and passengers.The aerodynamic effect of the subway train passing through the middle ventilating shaft with varying speed was simulated by numerical calculation method,and the distribution regularity of different parameters on the surface pressure of the train body was studied. The passenger comfort in the train was evaluated by the changing rate ofpressure in the train and the evaluation standard of the pressure fluctuation in 3 s. The results show that the peakto-peak pressure value of measurement points on the surface of the varying speed train body at 100 m before themiddle ventilating shaft are greater than those at 200 m and 300 m, which are 4.68% and 6.46% largerrespectively. When the speed is reduced from 120 km/h to 100 km/h at 300 m position before the ventilatingshaft, the interior pressure changes less than that at 100 m and 200 m position before the ventilating shaft underthe same condition, which are 10.72% and 5.07% less respectively. When the train decelerates to below 100 km/habove 200 m in front of the middle ventilating shaft, it can obviously relieve the pressure fluctuation in the trainand can meet the comfort requirements of the passengers in the subway.