Crosswind Aerodynamic Performances of a High-speed Train on Viaducts

摘要

On the basis of the three-dimensional, steady, incompressible Navier-Stokes equation and the k-ε double equation turbulence model, this paper analyze flow field characteristics and aerodynamic forces of a high speed train running on viaducts in crosswind, and place emphasis on influences of train speed and crosswind speed on train aerodynamic performance. Numerical results show that the flow field structure around the nose of head car is comparatively complex, and the pressure gradient is considerable large. Several vortexes appear on the leeward side of train, but no vortex appears on the windward and leeward side of the viaducts. Generally, aerodynamic forces of the head car are much larger than that of the middle car and tail car; moreover, they increase rapidly with train speed or crosswind speed. It implies that aerodynamic performance of the head car is worse than other cars, and is more easily to overturn or derail.