Influence of Ground Effect on Aerodynamic Performance of Maglev Train

Abstract

Three-dimensioned steady compressible Reynolds-averaged equation and RNG k-e equation turbulence model were used to simulate the aerodynamic performance of the two-carriage maglev train underground effect and research the effect of different ground and track conditions on the aerodynamic performance of maglev train. Numerical results were in agreement with experiment data through the wind tunnel test and the deviation between them is below 10%. The results indicated that compared with the moving track condition, the amplitude of pressure mutation at the bottom of train near the nose is smaller, the base pressure at non-streamline part of the train had little difference and the streamline part of tail car increase slightly under stationary condition. The moving ground or track made the aerodynamic drag of head car increase and the aerodynamic drag of tail car decrease, compared with different stationary ground or track conditions, the lift of the head car decreased by 12.82% and the tail lift increased by 16.27% maximally. The change of ground and track conditions has little effect on the lift of the train and air side force of the head train, the stationary ground had a great influence on the lateral force of the tail car, which decreased by 30.41% maximally.