Wind Tunnel Test And Numerical Simulation On Aerodynamic Performance Of High-speed Railway Wind Barrier

In order to ensure the safety running of high-speed trains in wind area, it is necessary to install reasonable wind proof structure. In this thesis, the porous wind barrier of the new Lanzhou-Xinjiang railway line is taken as the engineering background. The wind-shielding effect and pressure wave characteristics induced by high-speed trains passing through the wind barrier are studied, which provides reference and experience for the application of porous barrier to high-speed railway in wind area. The main work and conclusions are as follows:(1) A wind tunnel test of barrier-train-subgrade scaled model is designed and carried out. The pressure distribution of railway center line is measured by using the pressure column. The influence law of different heights and different porous rates on the wind pressure are studied.(2) A three-dimensional model of the wind barrier is established. The external flow fileds of the wind barrier changing with different heights and different porous rates are simulated. The distribution laws of the external flow filed are analyzed by using velocity and pressure contours. The numerical results are compared with those of the wind tunnel test to verify the validity of the model.(3) The whole process of a high-speed train passing through the wind barrier is simulated by the dynamic mesh technology. The change laws of wind pressure on the barrier and the train are obtained. By studying the pressure wave in some typical locations of train and wind barriers, its generation mechanism is analyzed. The reliability of the model is verified by comparing the numerical results with those of the test. The influences of the factors such as train speeds, with/without cross winds on pressure wave when a train passes through the wind barrier are discussed. In the end, the influence of wind barrier on the external flow filed around the train is analyzed.