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A Note Related to the Pressure Inside an Inflating Parachute Canopy

Published online by Cambridge University Press:  07 June 2016

P R Payne  and
E G U Band
P R Payne
Affiliation:
Payne Incorporated, Annapolis, USA
E G U Band
Affiliation:
Payne Incorporated, Annapolis, USA
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Summary

If a canopy is idealised as a cylinder with one end open to the free-stream flow, and the other end closed, then the internal flow during inflation is given by a simple analytic function. In this note the function is derived and then the internal pressures and corresponding forces associated with inflation are determined. It is found that, in addition to ram pressure and the von Kármán “virtual mass” terms in the pressure equations, there are other transient terms associated with radial velocity and acceleration.

Type
Research Article
Information
Aeronautical Quarterly , Volume 28 , Issue 4 , November 1977 , pp. 271 - 277
Copyright
Copyright © Royal Aeronautical Society. 1977

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References

1 Melzig, H D Time-dependent pressure distribution in a parachute canopy during inflation. Institut für Flugmechanik der Deutschen Forschungsanstalt für Luftfahrt, 1966.Google Scholar
2 Klimas, P C Fluid mass associated with an axisymmetric parachute canopy. Presented at the 5th Aerodynamic Deceleration Systems Conference, Albuquerque, NM, AIAA Paper 75-1352, November 1975.CrossRefGoogle Scholar
3 Klimas, P C Internal parachute flows. Journal of Aircraft, Vol 9, p 313, April 1972.Google Scholar
4 von Kármán, T Note on analysis of the opening shock of parachutes at various altitudes. AAF Scientific Advisory Group, Wright Field, Ohio (Date unknown).Google Scholar
5 Payne, P R A new look at parachute opening dynamics. The Aeronautical Journal, Vol 77, p 85, February 1973.Google Scholar