TY - EJOU
AU - Zhang, Xiaohan
AU - Jiang, Yao
AU - Li, Tian
TI - Effect of Streamlined Nose Length on the Aerodynamic Performance of a 800 km/h Evacuated Tube Train
T2 - Fluid Dynamics \& Materials Processing
PY - 2020
VL - 16
IS - 1
SN - 1555-2578
AB - The aerodynamic resistance of a train running in the open air limits the maximum
speed that can be attained by the train. For this reason, evacuated tube trains (ETT) are being
considered as valid alternatives to be implemented in the future. The atmosphere in the tube,
the so-called blocking ratio and the length of the streamlined nose are the key factors affecting
the aerodynamic performances of these trains. In the present work, we investigate evacuated
tube trains with different lengths of the streamline nose on the basis of computational fluid
dynamics (CFD). The three-dimensional steady compressible Navier-Stokes equations are
solved. The running speed of the ETT is 800 km/h and the blocking ratio is 0.2. Results show
that with the increase of the streamlined nose length, the aerodynamic drag and lift forces of
the head car decrease gradually, and the drag and lift forces of the middle car change slightly.
For the tail car, the drag force decreases, whereas the absolute value of the lift force increases.
At a speed of 800 km/h, a slight shock wave appears at the rear of the tail car, which affects
the aerodynamic forces acting on the train.
KW - Evacuated tube train
KW - resistance
KW - aerodynamic performance
KW - streamlined nose
DO - 10.32604/fdmp.2020.07776