A simple, approximate model of parachute inflation
A simple, approximate model of parachute inflation is described. The model is based on the traditional, practical treatment of the fluid resistance of rigid bodies in nonsteady flow, with appropriate extensions to accommodate the change in canopy inflated shape. Correlations for the steady drag and steady radial force as functions of the inflated radius are required as input to the dynamic model. In a novel approach, the radial force is expressed in terms of easily obtainable drag and reefing fine tension measurements. A series of wind tunnel experiments provides the needed correlations. Coefficients associated with the added mass of fluid are evaluated by calibrating the model against an extensive and reliable set of flight data. A parameter is introduced which appears to universally govern the strong dependence of the axial added mass coefficient on motion history. Through comparisons with flight data, the model is shown to realistically predict inflation forces for ribbon and ringslot canopies over a wide range of sizes and deployment conditions.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 10104879
- Report Number(s):
- SAND-92-2282C; CONF-930580-1; ON: DE93002465
- Resource Relation:
- Conference: 12. Royal Aeronautical Society/American Institute of Aeronautics and Astronautics (RAS/AIAA) aerodynamic decelerator systems technical conference,London (United Kingdom),10 May 1993; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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