CONTROL OF VEHICLE INTERIOR PRESSURE OSCILLATIONS INDUCED BY FLOW OVER OPEN SUNROOFS

摘要

Low-speed cavity resonance suppression techniques were investigated. The focus was on two methods: leadingedge spoiiers and Ieading edge air mass injection. Experiments were conducted in a closed test section windtunnel, which included a secondary blowing apparatus for controlling boundary layer thickness. The cavity,attached to the wind tunnel teat section, acted as a side-branch resonator. Smoke flow visualization was performedfor various operating conditions. The results suggested that these leading edge suppression techniques yield agreater or&e shear layer thickness. The thicker shear layer then causes greater vortex diffusion, a key parameterestablishing the level of the cavity pressore fluctuations. Diffuse vortices lead to weaker flow oscillations andlower vortex convection velocities.