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  • 1
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    Stabilizing Effect of Pseudo-Dendritic Polyethylenimine on Platinum Nanoparticles Supported on Carbon (2006)
    American Chemical Society
    Details
    Publikationsdatum: 2006-02-01
    Print ISSN: 1520-6106
    Digitale ISSN: 1520-5207
    Thema: Chemie und Pharmazie , Physik
    Publiziert von American Chemical Society
    Standort Signatur Erwartet Verfügbarkeit
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    AKTUELLE ARTIKEL
  • 2
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    Airloads Correlation of the UH-60A Rotor inside the 40- by 80-Foot Wind Tunnel (2014)
    Hindawi
    Details
    Publikationsdatum: 2014-01-01
    Beschreibung: The presented research validates the capability of a loosely coupled computational fluid dynamics (CFD) and comprehensive rotorcraft analysis (CRA) code to calculate the flowfield around a rotor and test stand mounted inside a wind tunnel. The CFD/CRA predictions for the Full-Scale UH-60A Airloads Rotor inside the National Full-Scale Aerodynamics Complex (NFAC) 40- by 80-Foot Wind Tunnel at NASA Ames Research Center are compared with the latest measured airloads and performance data. The studied conditions include a speed sweep at constant lift up to an advance ratio of 0.4 and a thrust sweep at constant speed up to and including stall. For the speed sweep, wind tunnel modeling becomes important at advance ratios greater than 0.37 and test stand modeling becomes increasingly important as the advance ratio increases. For the thrust sweep, both the wind tunnel and test stand modeling become important as the rotor approaches stall. Despite the beneficial effects of modeling the wind tunnel and test stand, the new models do not completely resolve the current airload discrepancies between prediction and experiment.
    Print ISSN: 1687-5966
    Digitale ISSN: 1687-5974
    Thema: Maschinenbau
    Publiziert von Hindawi
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    The Critical Role of Computational Fluid Dynamics in Rotary-Wing Aerodynamics (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-23
    Beschreibung: Helicopter rotor aerodynamics is basically the study of unsteady aerodynamic flows in a rotating and translating coordinate system. Current trends in this field are briefly reviewed by examining recent advances in lifting-surface theory, wake modeling, panel methods, and finite-difference models' Examples are used to illustrate selected current methods and some indications of promising future directions are highlighted.
    Schlagwort(e): Aerodynamics
    Materialart: Vertica (ISSN 0360-5450); Volume 11; Nos. 1, 2; 43-63
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Geometric analysis of wing sections (1995)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: This paper describes a new geometric analysis procedure for wing sections. This procedure is based on the normal mode analysis for continuous functions. A set of special shape functions is introduced to represent the geometry of the wing section. The generators of the NACA 4-digit airfoils were included in this set of shape functions. It is found that the supercritical wing section, Korn airfoil, could be well represented by a set of ten shape functions. Preliminary results showed that the number of parameters to define a wing section could be greatly reduced to about ten. Hence, the present research clearly advances the airfoil design technology by reducing the number of design variables.
    Schlagwort(e): AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: NASA-TM-110346 , A-950049 , NAS 1.15:110346
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Wake coupling to full potential rotor analysis code (1990)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The wake information from a helicopter forward flight code is coupled with two transonic potential rotor codes. The induced velocities for the near-, mid-, and far-wake geometries are extracted from a nonlinear rigid wake of a standard performance and analysis code. These, together with the corresponding inflow angles, computation points, and azimuth angles, are then incorporated into the transonic potential codes. The coupled codes can then provide an improved prediction of rotor blade loading at transonic speeds.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-102805 , A-90117 , NAS 1.15:102805
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Wing design code using three-dimensional Euler equations and optimization (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: This paper describes a new wing design code which is based on the Euler equations and a constrained numerical optimization technique. The geometry modification is based on a set of fundamental modes define on the unit interval. A design example involving a high speed civil transport wing is presented to demonstrate the usefulness of the design code. It is shown that the use of an Euler solver in the direct numerical optimization procedures is affordable on the current generation of supercomputers.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA PAPER 91-3190
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Euler solution of the transonic flow for a helicopter rotor (1987)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A new method is presented for calculating the quasi-steady transonic flow over a lifting or nonlifting rotor blade in both hover and forward flight by using Euler equations. The approach is to solve the Euler equations in a rotor-fixed frame of reference using a finite volume method. A computer program was developed and was then verified by comparison with wind-tunnel data. In all cases considered, good agreement was found with available experimental data.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA PAPER 87-0523
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Transonic flow analysis for rotors. Part 3: Three-dimensional, quasi-steady, Euler calculation (1990)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A new method is presented for calculating the quasi-steady transonic flow over a lifting or non-lifting rotor blade in both hover and forward flight by using Euler equations. The approach is to solve Euler equations in a rotor-fixed frame of reference using a finite volume method. A computer program was developed and was then verified by comparison with wind-tunnel data. In all cases considered, good agreement was found with published experimental data.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TP-2375 , A-86374-PT-3 , NAS 1.60:2375
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Airloads Correlation of the UH-60A Rotor Inside the 40- by 80-Foot Wind Tunnel (2013)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The presented research validates the capability of a loosely-coupled computational fluid dynamics (CFD) and comprehensive rotorcraft analysis (CRA) code to calculate the flowfield around a rotor and test stand mounted inside a wind tunnel. The CFD/CRA predictions for the full-scale UH-60A Airloads Rotor inside the National Full-Scale Aerodynamics Complex (NFAC) 40- by 80-Foot Wind Tunnel at NASA Ames Research Center are compared with the latest measured airloads and performance data. The studied conditions include a speed sweep at constant lift up to an advance ratio of 0.4 and a thrust sweep at constant speed up to and including stall. For the speed sweep, wind tunnel modeling becomes important at advance ratios greater than 0.37 and test stand modeling becomes increasingly important as the advance ratio increases. For the thrust sweep, both the wind tunnel and test stand modeling become important as the rotor approaches stall. Despite the beneficial effects of modeling the wind tunnel and test stand, the new models do not completely resolve the current airload discrepancies between prediction and experiment.
    Schlagwort(e): Aerodynamics
    Materialart: ARC-E-DAA-TN7153 , ARC-E-DAA-TN7085 , 51st AIAA Aerospace Sciences Meeting; Jan 07, 2013 - Jan 10, 2013; Grapevine, TX; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Correlating CFD Simulation with Wind Tunnel Test for the Full-Scale UH-60A Airloads Rotor (2011)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Data from the recent UH-60A Airloads Test in the National Full-Scale Aerodynamics Complex 40- by 80- Foot Wind Tunnel at NASA Ames Research Center are presented and compared to predictions computed by a loosely coupled Computational Fluid Dynamics (CFD)/Comprehensive analysis. Primary calculations model the rotor in free-air, but initial calculations are presented including a model of the tunnel test section. The conditions studied include a speed sweep at constant lift up to an advance ratio of 0.4 and a thrust sweep at constant speed into deep stall. Predictions show reasonable agreement with measurement for integrated performance indicators such as power and propulsive but occasionally deviate significantly. Detailed analysis of sectional airloads reveals good correlation in overall trends for normal force and pitching moment but pitching moment mean often differs. Chord force is frequently plagued by mean shifts and an overprediction of drag on the advancing side. Locations of significant aerodynamic phenomena are predicted accurately although the magnitude of individual events is often missed.
    Schlagwort(e): Aerodynamics
    Materialart: ARC-E-DAA-TN3232 , AHS 67th Annual Forum and Technology Display; May 03, 2011 - May 05, 2011; Virginia Beach, VA; United States
    Format: application/pdf
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