Low speed wind tunnel investigation of the aerodynamic and acoustic performance of several sonic inlet takeoff and approach geometries

A series of tests was conducted to determine the aerodynamic and acoustic performance of several sonic inlet takeoff and approach geometries. The effects of inlet lip shape and diffuser length were also investigated. The tests were conducted in a low-speed wind tunnel at free-stream velocities of 0 and 45 meters per second. Inlet incidence angle was varied from 0 deg to 50 deg. The inlets were sized to fit a 13.97-centimeter-diameter fan. In terms of the highest level of inlet total pressure recovery for a given amount of noise suppression, a cylindrical centerbody takeoff geometry and a bulb-shaped centerbody approach geometry provided the best results over all conditions of free-stream velocity and incidence angle. Increasing inlet lip contraction ratio extended the maximum incidence angle for attached lip flow, while increasing inlet diffuser length resulted in a higher total pressure recovery for a given amount of noise suppression

A Second Chance: Cary Nicholas and Frontier Florida

On the morning of July 17, 1821, the inhabitants of Pensacola gathered around the town’s public square to witness the ceremony marking the transfer of the Floridas from Spanish to American control. Among the new American residents in the crowd was Cary Nicholas, a thirty-four-year-old transplanted Kentuckian who, like so many others, saw in the territory the prospect for a new start in a life too full of disappointments and failures

AN EXPERIMENTAL INVESTIGATION OF GASEOUS-FILM COOLING OF A ROCKET MOTOR

Gaseous-film cooling of rocket combustion chambe