Effect of Bogie Cavity on Flow and Flowinduced Noise Behavior Around Highspeed Train Bogie Region

Abstract:

The behaviors of flow and aerodynamic noise produced around a highspeed train bogie are studied numerically at a scaled model based on the theory of vortex sound and the acoustic analogy method in this paper. The effect of bogie cavity on the flow and flowinduced noise performance is investigated. Results show that for isolated bogie and bogieinsidecavity cases, the volume dipole is the predominate source of nearfield quadrpole noise generated in the wake region close to the geometries. Moreover, as the main aerodynamic noise source for farfield noise radiation, the surface dipole noise is produced from the pressure fluctuation on the wall surfaces around the bogie areas. Compared with the isolated bogie configuration, the bogie cavity changes the flow around the bogie for the bogieinsidecavity case and consequently the directivity of the noise generated from the bogie wall surfaces is altered and the radiated aerodynamic noise level is reduced. However, the strong noise is generated on the rear wall of the bogie cavity.