| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 93 === Now the new design of underground station is required to build a doorway between the platform and railway. In order to release the pressure rise, generated due to piston effect by the moving trains on the two tracks in the underground, it designs to have the ventilation shaft, connected to the tunnel and penetrated upright into the ground atmosphere, and the bypass damper between two tracks. The commercial software STAR-CD is utilized as a simulation tool. The varying parameters are the trains’ velocity, the train operating on single or both tracks and the installation of bypass damper or not. There are 5 case studies taken into consideration. It is found that there would have the occurrences of pressure peak as the trains pass through the ventilation apparatuses. The highest pressure values in the flow field during the train operating on both tracks at velocities of 40, 65 and 80km/r are 501.8, 1549 and 2006 Pa, respectively. The corresponding occurring spots are all the same. The volume flow rates in the ventilation apparatuses are proportional to the trains’ velocity. From the predicted results, it shows that the cross-sectional area and the relative position of the ventilation apparatus have a great influence on the pressure release. Finally, this study finds that the establishment of bypass damper seems not to work well on the pressure release. If having no other purpose, it is suggested to remove it.
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