Aerodynamic Coefficients and Pressure Distribution of Solid Flat and Ringslot Models in One-Dimensional Velocity Gradients.

摘要

The results of wind tunnel studies of the aerodynamic characteristics of solid flat and ringlsot parachute models in flow with several linear one-dimensional dynamic pressure gradients are presented. The models had nominal diameters of about 16in. Gradients of 0%, 10%, 20%,and 40% of centerline dynamic pressure per foot with centerline velocities of 60ft/sec and 90ft/sec were established for the tests. Surface pressure measurements were made on rigid porous models,and drag coefficients obtained by integration of the pressure distribution. Aerodynamic force and moment coefficients were determined from force measurements on flexible models. (Author)