Running Safety of High-speed Train Equipped with Aerodynamic Brake under Cross Wind

The flow field structure and aerodynamic forces of trains with aerodynamic brake in cross-wind after simplifying the train's model are studied. Three-dimensional Reynolds average N-S equations (RANS) combining k-omega turbulence model is adopted. The SIMPLE method is used to couple the pressure and velocity. Firstly, the train's flow field's variation discipline caused by the aerodynamic brake is analyzed. Then the side force, lift force and rollover moment acting on the train with aerodynamic brake and the one without aerodynamic brake are compared on condition of various wind direction angles. The influence of the aerodynamic brake on trains' aerodynamic forces and derailment coefficient on condition of various wind direction are analysed. It comes to a conclusion that the derailment coefficient of the train with aerodynamic braking is truly increased but only slightly increased and all the derailment coefficients are under 0.8 which satisfy the safety request of the train's running safety.