Dynamic analysis of the effect of nose length on train aerodynamic performance
Journal article, 2019

The improved delayed detached eddy simulation (IDDES) was used to study the influence of the train’s nose
length on its aerodynamic performance. Both the time-averaged and instantaneous near-wake structures and the
associated distribution of slipstream velocity are compared for three nose lengths. As the nose length increases,
the mean and Std values of the drag and lift force are decreased. The shorter nose-length case results in a higher
slipstream velocity. In particular, at the TSI track-side position, the TSI value U_2δ
for the 5-m nose length case is 30% and 32% higher than the corresponding values for the 7.5-m and 10-m nose length cases, respectively. The
dynamical flow topology in the wake reveals that the flow structures of the 5-m nose length are different from
those of the other two cases in the tail streamline surface. As nose length increases, the longitudinal vortices are
weaker, and the angle and distance between the longitudinal vortices are smaller. The shear production from the P_xy
caused by the separation of the boundary layer at the lateral wall of the tail train is greater than that of the P_xz
caused by the separation of the boundary layer at the top and bottom of the tail train.

Author

[Person 68bcfd69-032c-4a94-9989-8f44d2ea6017 not found]

Central South University

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

[Person 01947d34-db65-4f40-beda-408b6ea8f15d not found]

Central South University

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

[Person 535b8279-0aa9-4215-a8f7-ae74f7515927 not found]

Central South University

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

[Person 09d7d113-16dc-4ec6-8a2c-c658e3982d91 not found]

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

Central South University

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

[Person 232c69b1-d7e7-4b64-80d3-18d7c61fd0ff not found]

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

Central South University

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

[Person 4af73d77-3cfd-4a09-b1ae-55626e5f760b not found]

National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle

Central South University

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

[Person 67761476-55dc-4e48-be92-10876f026830 not found]

Chalmers, Mechanics and Maritime Sciences, Fluid Dynamics

Journal of Wind Engineering and Industrial Aerodynamics

0167-6105 (ISSN)

Vol. 184 198-208

Areas of Advance

Transport

Subject Categories

Aerospace Engineering

Applied Mechanics

Fluid Mechanics and Acoustics

DOI

10.1016/j.jweia.2018.11.021

More information

Latest update

12/4/2020