Permeability of Two Parachute Fabrics - Measurements, Modeling, and Application

Cruz, Juan R.; O’Farrell, Clara; Hennings, Elsa; Runnells, Paul

doi:10.2514/6.2017-3725

Cited by 15 publications

(2 citation statements)

References 4 publications

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“…According to, 22 the fabric porosity could be represented by the air permeability of the fabric and the fictitious freestream airspeed:…”

Section: Mathematical Modelmentioning

confidence: 99%

Influence of fabric permeability on breathing phenomenon of supersonic parachute

Nie

et al. 2023

Journal of Industrial Textiles

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In order to investigate the dynamics and vortex shedding of flexible supersonic canopies, a compressible permeability model combined with fabric structure parameters is proposed, and the periodic oscillation of the supersonic parachute which is referred to as breathing phenomenon is simulated based on the Arbitrary Langrangian Eulerian (ALE) method. The calculated results by new permeability model are consistent with the experimental results. The underlying mechanism of canopy breathing motion is then investigated. Moreover, the influence of canopy permeability on breathing phenomenon of supersonic parachute is analyzed. The results indicate that the periodic growth and shedding of the canopy vortex causes the variation of the pressure differential, which finally lead to the periodic oscillation of the canopy. With the increase of fabric permeability, the vortex rolled up from the canopy skirt move backward and become more slender. The influence of vortex shedding on canopy breathing motion weakened. Those lead to the decrease of the average value of canopy projected area and parachute dynamic load. So are the oscillation amplitude and frequency. The parachute deceleration performance decreases while the parachute swing angle decreases as the canopy permeability increases.

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“…According to, 22 the fabric porosity could be represented by the air permeability of the fabric and the fictitious freestream airspeed:…”

Section: Mathematical Modelmentioning

confidence: 99%

Influence of fabric permeability on breathing phenomenon of supersonic parachute

Nie

et al. 2023

Journal of Industrial Textiles

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“…The second test program involved the measurement of the permeability characteristics of the fabrics used to fabricate the subscale parachute models used in the wind tunnel test (Ref. 3). Using these fabric permeability data, the total porosities, λ T , of the parachutes were determined.…”

Section: Introductionmentioning

confidence: 99%

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

Cruz

Snyder

2017

24th AIAA Aerodynamic Decelerator Systems Technology Conference

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Models are presented for the aerodynamic coefficients of Supersonic Ringsail and Disk-Gap-Band parachutes as functions of total porosity, λ T , Mach number, M, and total angle of attack, α 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 are applicable to flight operations on Mars.* An expanded version of this paper, including the source data, will be published as a NASA Technical Memorandum.

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