Dynamic analysis of the effect of nose length on train aerodynamic performance
Artikel i vetenskaplig tidskrift, 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.

Författare

Guang Chen

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

Central South University

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

Xiao Bai Li

Central South University

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

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

Zhen Liu

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

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

Central South University

Dan Zhou

Central South University

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

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

Zhe Wang

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

Central South University

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

Xifeng Liang

Joint International Research Laboratory of Key Technology for Rail Traffic Safety

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

Central South University

Sinisa Krajnovic

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Journal of Wind Engineering and Industrial Aerodynamics

0167-6105 (ISSN)

Vol. 184 198-208

Styrkeområden

Transport

Ämneskategorier

Rymd- och flygteknik

Teknisk mekanik

Strömningsmekanik och akustik

DOI

10.1016/j.jweia.2018.11.021

Mer information

Senast uppdaterat

2019-07-17