Research on the directional characteristics of wind noise emitted by bionic rods

In this paper, the directional characteristics of wind noise emitted by different bionic rods were studied based on a hybrid computational aeroacoustics method. The reduction mechanism surface grooves, pits, and bumps was analyzed, respectively. basic principle is to reduce influence vortex shedding rod changing shape or passive control technology dipole sound source. unsmooth transverse will increase loss flow leading edge vertical effect rod. convex can help transfer from low frequency high wake peak pressure level. cost those in aerodynamic drag direction (the amplitude fluctuation). particular, longitudinal v-groove structure elliptical circumferential while keeping coefficient unchanged.