Experimental Studies on Transitional and Closed Cavity Configurations Including Flow Control

摘要

THERE are a wide range of aerodynamic problems due to thenpresence of cavities. Cavities can generate both steady andnunsteady flow disturbances according to their geometry. Changes innmean static-pressure distributions inside the cavity can result in largenpressure gradients, and the unsteady flow disturbances can generatenself-sustaining oscillations which, in turn, generate acoustic tonesnthat radiate from the cavity. Both the steady and the unsteady flowsncan present difficulties for store separation from an internal weaponsnbay. The steady flows can generate large nose-up pitching moments,nand the unsteady flows can induce structural vibration. To ensure safencarriage and separation for transonic and supersonic speeds, a betternunderstanding of the physics of cavity flows must be obtained.