プラズマアクチュエータを用いたフィードバック音の制御

抄録

The control of flow and aerodynamic noise around an automobile bonnet model with dielectric barrier discharged (DBD) plasma actuator (PA) was investigated, where the bonnet model consists of a curvilinear body with a kink shape. From a flow around this model, intense tonal noise radiates by fluid-acoustic interaction. The sound and velocity fields were measured with a low-noise wind tunnel. The experiments were performed for two streamwise positions of the PA, x_pa /d = 0.12 and 0.50, with the co-flow and counter-flow with arrangements of the PA. As a result, the aerodynamic noise can be reduced by the control of the PA, at x_pa/d = 0.12. When the PA was set at x_pa/d = 0.12 with both arrangement of the PA. This is because the separation around the kink shape is suppressed and the vortices related with the tonal sound became weaker.