Abstract
Aerodynamic sound source of bogie section of high speed trains is studied to reduce aerodynamic sound, numerically. Three-dimensional unsteady flow around a bogie section is solved by voxel method and aerodynamic sound source are visualized by Lighthill-Curle's theory. Simulated results show the separate flow at the leading edge of the bogie section attaches to the surface of bogie components, and the inner region of bogie section becomes a dead water region. Visualization of aerodynamic sound shows that the strong sound sources are generated at the trailing edge of the bogie section, and at the cover of bogie component, where the unstable shear layer hit. Results show that it is necessary to control the large-scale flow separations to reduce aerodynamic sound of bogie section.
