Analysis of Effect of Cross Adit on Train-Tunnel Aerodynamic Multiple Peak Characteristics
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摘要: 为了研究横通道设置对压力波传播特性的影响，基于列车进入隧道所产生的压缩波在隧道与横通道交叉点的传播、反射理论，采用三维数值方法对设置横通道情况下的压力波传播特性进行了分析，对横通道设置不同位置时缓解微气压波的效果进行了比较.研究表明：首波压力梯度在列车进入隧道较短范围内（10 m）即达到峰值，横通道距隧道洞口距离增大，会使列车经过横通道所产生的2次波压力梯度峰值减弱，横通道距洞口距离由20 m调整为50 m，可使2次波峰值降低50%.Abstract: For research the effect of setting cross adit to compression wave transmission characteristic, A cross adit near the tunnel entrance relieves the peak of a micro-compression wave; additionally, it also affects the transmission characteristics of the compression wave. In this study, on the basis of the transmission and reflection theory of compression waves, created when a high-speed train enters the tunnel, at the cross point of a tunnel and an adit, the effect of a cross adit on compression wave transmission characteristics was analysed using a three-dimensional model. Furthermore, various cross adit positions were compared in terms of their efficiency in relieving micro-compression waves. The research results showed that when the train enters approximately 10 m into the tunnel, the peak value of the first wave pressure gradient is attained. With increasing distance between the cross adit and tunnel entrance, the peak value of the pressure gradient of the second wave, created when the train passes the cross adit, decreases slightly. When the distance between the cross adit position and the tunnel entrance is changed from 20 m to 50 m, the pressure gradient peak value decreases by up to 50%.
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Key words:
- high-speed train /
- tunnel /
- cross adit /
- aerodynamic effect /
- micro-pressure wave
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图 2 数值计算中隧道及横通道布置示意(单位:m)
Figure 2. Tunnel and cross adit setting dimension in numeral simulation (unit: m)
图 4 无横通道时隧道内测点压力及压力梯度变化曲线
Figure 4. Variation of pressure and pressure gradient in tunnel without cross adit
图 6 隧道内测点压力波动特性分析简图
Figure 6. Calculation graph of pressure variation at measure point in tunnel
图 7 不同横通道设置位置时隧道内测点压力及压力梯度曲线(测点距隧道入口200 m)
Figure 7. Pressure and pressure gradient curve at measure point in tunnel with different cross adit setting position (the measure point is 200 m to tunnel entrance)
表 1 隧道内测点压力及压力梯度峰值
Table 1. Pressure and pressure gradient peak value in tunnel
测点距洞口入口距离/m 无横通道 有横通道 压力峰值/kPa 压力梯度峰值/(kPa·s-1) 压力峰值/kPa 压力梯度峰值/(kPa·s-1) 10 1.60 18.0 — — 15 1.80 12.7 — — 20 1.90 12.6 — — 200 2.20 12.6 2.17 9.3 
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表 2 压力梯度多波峰出现时刻对照表
Table 2. Pressure gradient multiple peak appearing period comparison table
s 首波波峰次数 峰值时间差 数值计算 理论分析 2次波波峰 0.178 0.178 2次波波谷 0.314 0.323 3次波波峰 0.450 0.457
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