NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsEstimates for the Aerodynamic Coefficients of Ringsail and Disk-Gap-Band Parachutes Operating on MarsThe creation of flight dynamics simulations is often part of the design, development, and flight operations of missions that include entry, descent, and landing (EDL) in their concept of operation. Such flight dynamics simulations include models for many of the EDL sub-systems. For EDL systems that include a parachute, models of the parachute’s aerodynamic characteristics must be created for inclusion in the flight dynamics simulations. Models are presented for the aerodynamic coefficients (i.e., C(D),C(Tot),C(T),C(N), and C(m,SLCP)) of Supersonic Ringsail (SSRS) and Disk-Gap-Band (DGB) parachutes as functions of total porosity, λ(T), Mach number, M, and total angle of attack, λ(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 λ(T). The fabric permeability test data necessary for the calculation of λ(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 λ(T) and M, they are capable of producing good reproductions of the source data. The (λ(T), M) domains over which these models are applicable are clearly defined. The models and their domains are applicable to flight operations on Mars. The models presented in this report are not unique – other models could be created from the source data. To make the creation of alternative numerical models, the aerodynamic coefficients source data are included in this report.Document ID20170011486Acquisition SourceLangley Research CenterDocument TypeTechnical Memorandum (TM)AuthorsCruz, Juan R.*(NASA Langley Research Center Hampton, VA, United States)*Snyder, Miranda L.*(NASA Langley Research Center Hampton, VA, United States)*Date AcquiredDecember 1, 2017Publication DateOctober 1, 2017Subject CategoryAerodynamicsReport/Patent NumberNF1676L-27003L-20812NASA/TM-2017-219619Funding Number(s)WBS: WBS 971200.02.07.01Distribution LimitsPublicCopyrightWork of the US Gov. Public Use Permitted.Available DownloadsNameType20170011486.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsIDRelationTitle20170005774See AlsoEstimates for the Aerodynamic Coefficients of Ringsail and Disk-Gap-Band Parachutes Operating on Marsvisibility_offNo Preview Available
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