| Along the high-speed railway,the landform is complex and the driving environment is varied,especially in some special wind environment,there is a huge threat for the driving security of trains.In order to ensure the driving security of the trains in the wind area,it is necessary to set up anemology stations to monitor the wind change along the railway in wind areas,and the far field wind velocities are reflected according to the upwind velocities.Based on the computational fluid dynamics(CFD)method,the numerical simulations of different line types of high-speed railway are carried out.By studying the distribution of flow field with and without the condition of wind-break facilities,the wind speed distribution laws are got under conditions of different slopes of embankment,depths of cutting,wind barrier heights and wind-break wall(wind barrier)ventilation rates.And the final anemology station of the wind speed is determined as follows:(1)In the ground roadbed without wind-break wall,the anemology station will be arranged at the appropriate location outside 50m from the windward;when the height of the wind-break wall is less than 5m,the anemology station is arranged at the height of the 8m above the orbit center.The wind speed of the anemology station is equal to the wind speed of the far field.(2)Under the conditions of 6m high embankment with no wind-break wall,the anemology station will be arranged at the distance of 90m from the windward above 4m from the orbit center;when the wind-break wall is less than 4.5m,the anemology station should be arranged at the distance of the 8m above the orbit center.(3)The depth of the cutting has little effect on the distribution of the wind speed at the front and back near the line,so that the anemology station is arranged at a suitable position at the upper edge of the cutting at a height of 4 m from the ground.(4)For the bridge sections,the anemology station should be arranged at the height of the 7.5m above the orbit center.And the relationship of speed at anemology station and far field wind speed is linear.The results of this study can provide a reference for the layout of the anemology station of high-speed railway wind warning system in China. |
