21002 Effect of ejection conditions of synthetic jet on the reduction of aerodynamic noise emitted from pantograph head

Abstract

As the running speed of Shinkansen increases, the reduction of aerodynamic noise emitted from a pantograph head of Shinkansen becomes more important. This paper describes CFD analysis on the flow control around the pantograph head using synthetic jet actuator (SJA). In this study, spanwise and streamwise orientations of rectangular orifice are analyzed. In the case of streamwise oriented orifice, the cross-sectional area of orifice is also changed under the conditions of constant momentum coefficient or volume flow rate of SJA. The results of CFD analysis indicate that the streamwise oriented orifice is more effective than the spanwise one against the reduction of aeolian tone and that a dominant parameter which determines the reduction of aeolian tone is volume flow rate of SJA.