Wind tunnel experiment on aerodynamic characteristics of high-speed train–bridge system under crosswind
(2.National Engineering Laboratory for High-Speed Railway Construction, Central South University, Changsha, Hunan Province, China 410075)
【Abstract】To study the aerodynamic characteristics of a high-speed train in operation and analyze the mechanism of aerodynamic characteristics, we design two wind tunnel experimental schemes for aerodynamic characteristics of the high-speed train–bridge system. A high-speed train–bridge test system appropriate for wind tunnel is developed and established. The system consists of two parts including the motion system and the data acquisition system. The motion system is based on the inertial drive mechanism. The high-speed servo motor serves as the power, through the high strength rotary conveyor belt, and the moving vehicle model with a scale ratio of 1:8–1:30 at a maximum speed of around 50 m·s−1 could run in the wind tunnel to simulate the real operating environment. With the motion system as the carrier, a set of data acquisition systems were developed for measuring the aerodynamic characteristic of trains with or without the crosswind in the wind tunnel. Analysis result shows that the experimental method and system can be applied to the test scenarios with a short acceleration/deceleration distance and the high instantaneous acceleration. The system is not only free from the shape of vehicles and infrastructures but also reduces the design cost and improves the safety and stability of the test. The standard error-mean value ratios are less than 10%, which shows that the aerodynamic characteristics of the train tested by the data acquisition system have good stability and repeatability. The aerodynamic characteristics of the train in different tests can be obtained accurately. By comparing the test of trains with or without the crosswind, we can find that the impact of speed of moving trains on the aerodynamic is extremely important. While the train running at high speed, the aerodynamic effects due to the speed of trains are much larger than those of the crosswind. Moreover, the mean wind pressure coefficient is up to −10, which reflects that the test method of a static model cannot meet the requirements for the simulation of the aerodynamic characteristics of the train in high-speed operation.
【Keywords】 high-speed train; train–bridge system; wind tunnel test; crosswind; aerodynamic characteristic; surface wind pressure;
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