The author conducts a case
study considers a metro station in Wuhan, China, where a smoke exhaust system
that integrates rail top fans and large system fans is utilized. The aim is to
investigate the changing characteristics of the flow field during train overrun
conditions through on-site
tests conducted as trains pass over the station. The test results are used to
validate the numerical calculation method for the full-size
station, where the visibility, CO concentration, and temperature on the
platform in the event of a baggage fire are assessed. In addition, the
effectiveness of smoke control on the platform during train crossings is
evaluated. The results reveal the following: (1) In the absence of a train, the
downward wind speed at the escalator ranges from 1.8 to 3.5 m/s. (2) When a
train crosses the station at 40 km/h, the downward wind speed at the escalator
experiences three phases: an initial decrease, followed by an increase, and
then a final decrease, ultimately reaching approximately 0.5 m/s. (3) The train′s passage significantly affects the wind speed at the escalator,
with the timing of these changes closely linked to the train′s travel time. The smoke simulation results demonstrate that: (1) In
the absence of a train, the smoke control measures are effective. (2) When a
train crosses the station at 40 km/h, the collaborative smoke exhaust system
performs well, effectively limiting the spread of smoke. However, localized
areas near the L5 escalator, which is close to the fire source and constitutes
approximately 10% of the platform area, show elevated levels of CO
concentration, reduced visibility, and abnormal temperature readings.
GAN Tian
. Effects of a Train
Overtaking a Station on Metro Platform Smoke Exhaust Characteristics Under a Collaborative Smoke Exhaust System[J]. Tunnel Construction, 2025
, 45(2)
: 324
-331
.
DOI: 10.3973/j.issn.2096-4498.2025.02.008
