Study on the pressure wave and interior pressure fluctuation of the intercity EMU passing through the tunnel
The demand for large passenger capacity of intercity EMU leads to a shorter streamlined train head, the demand for small cross section of the intercity/suburban line tunnel leads to a larger blockage ration of the train passing through the tunnel. The pressure wave and interior pressure fluctuation...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2022-11-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128X.2022.06.007 |
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| Summary: | The demand for large passenger capacity of intercity EMU leads to a shorter streamlined train head, the demand for small cross section of the intercity/suburban line tunnel leads to a larger blockage ration of the train passing through the tunnel. The pressure wave and interior pressure fluctuation of the train passing through the tunnel are the prominent problems, which affect the comfort of the passengers. This paper mainly focuses on the pressure wave and interior pressure fluctuation of the intercity EMU passing through the tunnel under the condition of large blockage ratio. Based on the three-dimensional transient compressible RANS equation and the SST <italic>k</italic>-<italic>ω</italic> turbulence model, the numerical calculation method of pressure wave of the intercity EMU passing through the tunnel was established using the slip grid technology. The pressure wave characteristics of the train passing through the tunnel were studied for different train speeds and different tunnel diameters. The empirical formula was used to calculate the interior pressure fluctuation under different dynamic tightness coefficients. The computational results show that the pressure wave of the intercity EMU passing through the tunnel is mainly determined by the train speed and the blocking ratio, and the influence of the train speed is more significant. With the increase of the train speed, the interior pressure fluctuations of the passenger compartment area and the driver's cab area are significantly increased. The interior pressure fluctuation of the driver's cab area is greater than that of the passenger compartment area. When the train speed is 160 km/h, the interior pressure fluctuations of the passenger compartment area and driver's cab area reach the good standard when the dynamic tightness coefficient reaches 5 s, for the tunnel diameters of 7.2 m and 7.4 m. When the train speed is 200 km/h, the interior pressure fluctuations of the passenger compartment area and driver's cab area reach the good standard when the dynamic tightness coefficient reaches 8 s, for the tunnel diameters of 7.2 m and 7.4 m. |
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| ISSN: | 1000-128X |