Numerical Simulation Research Of Pneumatic Drive Windscreen Wiper Used For High-Speed Locomotive Based On Fluent

The super-railway produces enormous economic benefits and some technical difficulties as well. The performance of domestic windscreen wiper can not meet the requirements of high speed locomotive due to its simple structure, insufficient strength, high propensity to breakdown, low reliability and so forth, and may bring about potential hazards.Zhu Zhou Lince Group FuLi industry COM. Ltd has introduced overseas advanced technology from the beginning of 2004 and cooperated to develop the pneumatic drive windscreen wiper (Type TASW-75), which can be applicable to China's domestic high-speed locomotive. With advantages of high-reliability, long-life duration, and excellent performance, this windscreen wiper is applicable to the high-speed locomotive with the speed of 300km/h.The thesis dedicated to the research of the pneumatic drive windscreen wiper (Type TASW-75), utilized the software PRO-E to build the 3D dynamic model of the locomotive and the pneumatic drive windscreen wiper, and then simplified the mathematic model. Considering the complexity of the model, the calculation requirements, and the capacity of the computer, Tet type elements were used to mesh the liquid area, which is in shape of cuboid. Fluid analysis software Fluent was used to simulate the external flow field of the steady-state running train with the speed of 345km/h. The 3D, steady, and uncompressible Navier-Stokes equation and bi-equation model was used to calculate the flow field. The motion process simulation of the windscreen wiper was disposed into simulations of three different specific positions. The external flow field speed of the train and the pressure distribution can be attained by analyzing the train velocity field and the pressure field in the three different specific positions. The method of reducing the train pressure drag was proposed to provide theoretical basis for the improvement.of the train aerodynamic characteristics. The impact on the train flow field caused by windscreen wiper can be achieved by comparing the different aerodynamic characteristics in three positions respectively.According to the requirements referred in the experiment handbook, the surface pressing of the three positions was calculated and compared. The maximum torque was achieved and compared with the experimental results. The simulation had a good agreement with the requirements in the manual.The massive acceleration was presented when the train was accelerated, which can increase the pressure between windscreen wiper and the windscreen. The windscreen wiper drive shaft transient maximum torque when the train started and accelerated to 345km/h was calculated.The maximum torque obtained had a good agreement with the requirements in the experiment manual, which means this type of windscreen wiper drive shaft can meet the design requirement.