Effect of Aerodynamic Drag on Performance of High Speed Train
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Date
2016-09
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
The aerodynamic drag resistance is the main constraint on the performance of high speed
rolling stock technology. Its effect increases as speed of train increases and with poor
aerodynamic body shape design of high speed train body. Problems such as passenger
discomfort, safety conditions reduction, environment disturbance, and more traction power
consumptions are main effects of aerodynamic drag resistance. This thesis investigates the
effect of aerodynamic drag resistance of passenger rolling stock of two high speed train models
with leading car, middle coach, and tail car. The first train model is existing European ICE-2
Regional Train and the second modified train model is called Ehio-HST-250+. The
aerodynamic investigation is done using CATIA V5R20 modeling software and ANSYSFluent
V 17.0 Computational Fluid Dynamics (CFD) simulation software. The numerical
method used on Fluent solver is viscous-incompressible steady state Reynolds Average NavierStock
(RANS)
and
two equation
turbulence
model
of
Realizable
k
-
ε
model
(RKΕ)
with
Nonequilibrium
wall
function
(NWF)
of
near
wall
treatment
for
the
simulation
of
the
system
in
an
open
air
condition.
The
input
data
to
the
CFD
software
are
collected
from
relevant
literatures
with
consideration of Ethiopian average air temperature of 25°C for input air property
variables. The study does not include passenger discomfort, safety conditions (cross wind,
tunnel test etc.), pantograph component, and vibration of the vehicle as time and computing
material quality limits. Thus using steady RANS CFD method in open air condition, reduction
of coefficient of aerodynamic drag percentage amount of 49.01% of enormous aerodynamic
drag is reduced and 636.13 kW traction power is saved. This can increase the safe and comfort
environment of the system.
Description
Keywords
ANSYS-Fluent V 17.0, CATIA V5R20, Computational Fluid Dynamics (CFD), Inter City Express (ICE-2 Train), Reynolds Average Navior-Stock (RANS), Realizable k – ε model (RKΕ), Non-equilibrium wall function (NWF)