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

Abstract

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-ω 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.

Numerical simulation and optimization on opening angles of aerodynamic braking plates sets for a maglev train

“…Many literatures concentrated on the parameters of installation position and number, shape, different opening angles, braking plate height, axial and lateral spacing, and got the variation rule of braking force and proposed the corresponding design scheme [6][7][8]. Besides, some literatures studied the performance of aerodynamic braking under special circumstances, such as crosswind environment [9], bird impact [10] and aerodynamic noise [11]. Lots of research results demonstrated that aerodynamic braking was an effective and reliable emergency-braking technology in highspeed trains, and its implementation had also been achieved [12,13].…”

Effect of Braking Plates on the Aerodynamic Behaviors of a High-Speed Train Subjected to Crosswinds

“…Niu et al [9,10] studied the mutual influence of braking plates, and believed that the installment position of braking plates was very important. Tian et al [11] used a simplified train model to study the effect of braking plates on the derailment coefficient. Zhai et al [12] mainly studied the flow field structure near the braking plate with and without crosswind but paid little attention to the aerodynamic characteristics of trains.…”