NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Estimates for the Aerodynamic Coefficients of Ringsail and Disk-Gap-Band Parachutes Operating on MarsModels are presented for the aerodynamic coefficients of Supersonic Ringsail and Disk-Gap-Band parachutes as functions of total porosity, Lambda(sub t), Mach number, M, and total angle of attack, Alpha(sub t) (when necessary). The source aerodynamic coefficients data used for creating these models were obtained from a wind tunnel test of subscale parachutes. In this wind tunnel test, subscale parachutes of both parachute types were fabricated from two different fabrics with very different permeabilities. By varying the fabric permeability, while maintaining the parachute geometry constant, it was possible to vary Alpha(sub t). The fabric permeability test data necessary for the calculation of Alpha(sub t) were obtained from samples of the same fabrics used to fabricate the subscale parachutes. Although the models for the aerodynamic coefficients are simple polynomial functions of Alpha(sub t) and M, they are capable of producing good reproductions of the source data. The (Alpha(sub t), M) domains over which these models are applicable are clearly defined. The models are applicable to flight operations on Mars.
Document ID
20170011486
Document Type
Technical Memorandum (TM)
Authors
Cruz, Juan R. (NASA Langley Research Center Hampton, VA, United States)
Snyder, Miranda L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
December 1, 2017
Publication Date
October 1, 2017
Subject Category
Aerodynamics
Report/Patent Number
NF1676L-27003
L-20812
NASA/TM-2017-219619
Funding Number(s)
WBS: WBS 971200.02.07.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 20170011486.pdf STI

Related Records

IDRelationTitle20170005774See AlsoEstimates for the Aerodynamic Coefficients of Ringsail and Disk-Gap-Band Parachutes Operating on Mars