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

Cruz, Juan R.; Snyder, Miranda L.

Models 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

20170005774

Acquisition Source

Langley Research Center

Document Type

Conference Paper

Authors

Date Acquired

June 27, 2017

Publication Date

June 2, 2017

Subject Category

Report/Patent Number

Meeting Information

Meeting: AIAA Aerodynamic Decelerator Systems Technology Conference (2017)

Location: Denver, CO

Country: United States

Start Date: June 2, 2017

End Date: June 9, 2017

Sponsors: American Inst. of Aeronautics and Astronautics

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Distribution Limits

Public

Work of the US Gov. Public Use Permitted.

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