The influence of piston effect induced by MRT train to the passenger comfort and platform screen door wind pressure
Date Issued
2011
Date
2011
Author(s)
Weng, Ying-Che
Abstract
This article numerically investigates the flow field and presssure gradient which induces by piston effect when the train moving into tunnel. The underground mass rapid transit (MRT) includes tunnel entrance, pressure release shaft, bypass and main station. This paper studies the pressure change with number of MRT cases by using three-dimensional numerical simulation software, PHOENICS. There are three parts of MRT to be studied. The first part is to examine the human comfort of original design at tunnel entrance and simulate the tunnel entrance with different tilt angles and blackage ratios. The results show that the pressure change rate has the minimum value at tilt angle of 30o and blockage of 2.4. The second part is to simulate the station with pressure release shaft at different train speeds. The results indicate that the platform screen door (PSD) conforms to original design wind pressure of 3200 Pa and the pressure release shaft also has the shaftilation effect. The final part is to simulate and verify the train moving through different underground structures with normal speed of 65 km/hr. The results describe that the bypass device has decrease 7.9% PSD wind pressure than without. In the train pass by MRT structure sequence simulation, the train passes through bypass and then pressure release shaft has decreasement 4.2% PSD wind pressure. At the distance of 30 m from pressure release shaft to station, the PSD wind pressure has 5.3% decresement. In different pressure release vent area simulation tests, the PSD wind pressure has 4.5% decresement at 36 m2 pressure release vent area. In the pressure release shaft length simulation examination, the PSD wind pressure has decresement of 19.5% at the pressure release shaft length of 20 m.
Subjects
Piston effect
Pressure change rate
platform screen door wind pressure
File(s)![Thumbnail Image]()
Loading...
Name
ntu-100-D95522029-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):2a3249c9f88c6e4b506471d893c27b41