In order to improve the windbreak effect of the earth type windbreak wall of Xinjiang single-track railway and to prevent trains from overturning, two optimization schemes were proposed. Scheme 1 was to change only the windward slope angle, while scheme 2 was to change synchronously both the windward and leeward slope angles which were equal. Numerical simulation method was used to analyze and compare the influence of two optimization schemes on the aerodynamic coefficient of train. Results show that when the train is under stationary state, the optimum windward slope angle is 57° in project 1, while both the windward and leeward slope angles are 69° in project 2. Under the dynamic condition that when the train is running at the speed of 20~120 km·h-1, in order to achieve the best windbreak effect with the overturning moment of train is 0, the windward slope angle must also increase with the increase of train speed in scheme 1. But in scheme 2, both the windward and leeward slope angles are nearly unchanged with train speed. Thus, scheme 2 is proposed to be adopted for the optimization design of earth type windbreak wall in practical engineering.
China Railway Science