When a train transits
through a double-track tunnel at high speed,
the geometric space between the train and the tunnel is asymmetrical, the air
flows asymmetrically on both sides of the train, and the pressure environment
inside the tunnel is complex. These factors result in different degrees of
variation in pressure on both sides of the train, which are induced by the
train body and tail vortex. To examine the pressure fluctuations at the train
surface and the aerodynamic interrelationships and vibration spectral
characteristics of the train body, a 1:1 aerodynamic simulation model of a high-speed train with eight coaches traveling at 400 km/h is established
using a threedimensional, unsteady compressible flow NS equation and the IDDES turbulence model. The overlapping grid
technology is used to simulate the relative motion between the train and the
tunnel. The results indicate the following. (1) The train traveling inside the
tunnel undergoes large-scale changes in pressure
differential and lateral force amplitude on both sides of the carriage under
the action of the pressure waves in the tunnel, and the degree of change
increases from the head to the rear of the train. (2) There is a pair of
reverse vortices in the wake area of the train when it is traveling inside the
tunnel. (3) The main frequency of vortex shedding of the train tail in an open-track section is 2.002 Hz, whereas it is 3.003 Hz when the train is
traveling inside the tunnel. (4) When the train is traveling on in open-track section or tunnel, the vibration frequency of the train body
caused by aerodynamic lateral force and its yaw moment is 2.002 Hz.
XIE Xinyu
,
GAI Jie
,
MA Yao
,
MEI Yuangui
. Aerodynamic Mechanism of
Lateral Vibration of High-Speed Train at 400 km/h Inside a Tunnel[J]. Tunnel Construction, 2024
, 44(7)
: 1477
-1490
.
DOI: 10.3973/j.issn.2096-4498.2024.07.014
