VISUALIZATION OF THE FLOW FIELD ABOUT PARACHUTE CANOPY MODELS AND APPROXIMATION OF CANOPY PRESSURE DISTRIBUTIONS.
Final rept. Mar-Oct 63,
AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
An experimental investigation of the flow field about rigid two-dimensional models of parachute canopies was conducted. Models representing the inflated profile shapes of the drag-producing surface of nine parachute canopy types were tested in the Air Force Institute of Technology AFIT Smoke Tunnel Test Facility. Angles of attack varied from 0 to 30 degrees and photographs of the models and attendant smoke stream patterns were obtained for each test condition. In addition, static pressure distributions were obtained for a circular cylinder and for a concave semicircular cylinder. Measured pressure values were reduced to appropriate force coefficients. The pressure distribution of the circular cylinder and the derived pressure force coefficient values for both models showed good agreement with published data for these shapes. An approximation of the pressure distribution about an actual inflated parachute canopy, derived from the two-dimensional pressure and force data, three-dimensional force data, and certain simplifying assumptions, is introduced. Author