20513 Study on the Effect of Different Aspect Ratio of Rectangular Orifice on Flow Control Around Pantograph Panhead Using Synthetic Jet Actuators

It is important to reduce aerodynamic noise generated by pantograph panheads on high-speed trains. The former study reported that aerodynamic noise can be reduced by using synthetic jet actuators. In this study, the authors analyzed the flow field around pantograph panhead with synthetic jet actuator which has rectangular orifice using CFD. Analysis results show that the reduction of velocity fluctuation depends on the aspect ratio of orifice and frequency of synthetic jet actuators. It is expected to improve efficiency of flow control by the combination of these components of synthetic jet actuators.