Research on Aerodynamics and Noise of Pantographs with Circular Cylinder and Twisted Cylinder

Abstract:

Due to the importance of the pantograph for high-speed train， the aerodynamic and noise simulation analyses of the pantographs with circular cylinder and twisted cylinder were conducted. Compared with the pantograph with circular cylinder， although the average resistance of the pantograph with twisted cylinder is slightly increased， its average and pulsating lift force is greatly reduced， which is helpful to improve the operation stability and current quality of the pantograph from the viewpoint of aerodynamic. The cluster analysis of the pantograph wake flow field indicates that there are three closed-loop conversion paths in the wake flow field of pantograph with circular cylinder and twisted cylinder. Compared with the circular cylinder， the second conversion path of the twisted cylinder is slightly shorter， but the third conversion path is slightly longer. When the lower arm changes from the circular cylinder to the twisted cylinder， the single vortex transforms to multiple alternating positive and negative vortices in the vertical direction. The pantograph with the twisted cylinder can eliminate the peak noise of the pantograph with the circular cylinder and reduce the total sound pressure level by 1.5 dB， which is beneficial to improve the aerodynamic noise performance of the pantograph.

Key words:circular cylinder;twisted cylinder;pantograph;cluster analysis;aerodynamic and noise