Optimization Research And Design Of New Double Wind-break Walls Along Lanzhou-Urumqi High-speed Railway In Gale Areas

Abstract

The galloping of the catenary positive feeder and sand deposition along the railway are very serious of LanzhouUrumqi high-speed railway in the gale areas. In this paper, the second wind-break wall was set up at different positions of the windward side embankment, and the flow field model of the computational domain was established based on the theory of hydrodynamics. The aerodynamic characteristics of the positive feeder and the change of sand deposition along the railway under the condition of double wind-break walls were analyzed. The results show that the range of wind speed growth area at the positive feeder is significantly reduced after the second wind-break wall was set up under the embankment, and the change of the height and position of the wind-break wall has an important influence on the aerodynamic characteristics of the positive feeder. When the second wind-break wall was 0.5 m away from the embankment, the aerodynamic coefficient of the positive feeder is relatively low. At the same time, with the increase of the height of the wind-break wall, the lift and drag coefficient of the positive feeder does not show a continuous decreasing trend. Therefore, on the basis of considering the economic cost and through comparative analysis, the second wind-break wall was designed to be 0.5 m away from the embankment and 1 m height. It can not only restrain the galloping of the positive feeder to a certain extent, but also effectively alleviate the hazards of sand deposition on the railway, thus greatly improving the stability of train operation safety in gale areas.

Keywords

• lanzhou-urumqi high-speed railway
• wind-break wall
• positive feeder
• aerodynamic characteristics
• sand deposition