1191 FLOW CONTROL AROUND A PANTOGRAPH HEAD USING SYNTHETIC JET ACTUATORS FOR REDUCTION OF AEROACOUSTIC NOISE

Reduction of aeroacoustic noise from a pantograph head of high-speed trains has become increasingly important. For this purpose, we introduce a flow control method using synthetic jet actuators. The wind tunnel test results show that aeolian tone from the pantograph head can be reduced under the wind velocity of 25m/s, but that under higher free-stream velocity, the reduction effect is less. Therefore, synthetic jet actuators that are compact and can induce higher mixing action are necessary for high-speed flow control. The experimental results obtained in this study will contribute towards the design of synthetic jet actuators applicable for a pantograph head.