Contrails
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Pressure Distribution During Parachute Opening. Phase 1. Infinite Mass Operating Case

Report Number: AFFDL TR 66-10
Author(s): Melzig, H. D.; Schmidt, P. K.
Corporate Author: Deutsche Forschungsanstalt Fuer Luft- Und Raumfahrt E V Brunswick (Germany Fr) Inst Fuer Flugmechanik
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1966-03
Pages: 138
Contract: AF 61(052)-681
Project: 6065
Task: 60653
AD Number: AD0482534

Abstract:
An experimental investigation and correlative analysis were conducted to determine the pressure distribution over the surface of parachute canopies during the period of inflation for the infinite mass case and to correlate pressure coefficients with inflating canopy shapes. Parachute canopy models of Circular Flat, 10% Extended Skirt, Ringslot, and Ribbon designs were tested under infinite mass conditions in a 9 x 10 ft low speed wind tunnel. External and internal pressure values were measured at various locations over the surface of the model canopies throughout the period of inflation, and generalized canopy profile shapes were obtained by means of photographic analysis. Pressure coefficients derived for the steady state (fully open canopy) are quite comparable to the results of previous measurements. Peak pressure values during the unsteady period of inflation were found to be up to 5 times as great as steady state values. The relationships between the pressure distribution and time for each of the canopy models deployed at free-stream velocities between 70 and 160 ft/sec. are presented.

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