Study of the Aerodynamic Performance of Pantograph Bowhead with Serrated Lower Surface in the Thermal Management Systems of the High-Speed Train Electrical Devices

The thermal management problems of traction drive systems for high-speed trains are great importance the operation reliability trains. performance transformer and rectifier mainly affected by aerodynamic pantograph. Nine bowheads with different sawtooth structures on lower surface proposed a CFD numerical model is built Transition SST turbulence model. influence number height sawteeth characteristics bowhead flow field investigated. results show that compared rectangular bowhead, drag 5w3h-shaped reduced 8.6%, 8.7%, 9.9% at train speeds 250 km/h, 300 350 respectively. promotion pantograph beneficial to improve