Development of models and algorithms of aerodynamic drag of a high-speed train and calculations of particle entrainment

Abstract

The work is a study of the patterns of jet-cavitation air flows when flowing around a high-speed passenger train. On the basis of theoretical studies, the forces of resistance (frontal and near-wall) of the external environment to the movement of the train, the influence of cavitation currents on the near-wall layer, the current flows generated during the movement of the rolling stock, the resistance of the external environment of the rolling stock, both as a whole and on each car of the train, are determined, the influence of cavitation flow from solid particles lying on the underlying surface, critical velocities that reduce the entrainment of solid particles, establishing the regularity of the movement of entrained solid particles. The work also includes a theoretical determination of the aerodynamic drag coefficient and hydrodynamic pressure forces, normal and shear stresses on the surface of the wall of a train consisting of n cars, a study of the effect of gaps between cars and on the speed characteristics of the train, leading to a change in the acceleration of cars.