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  • AERODYNAMICS  (785)
  • 1980-1984  (785)
  • 1982  (419)
  • 1981  (366)
  • 1
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    Multidomain approach for calculating compressible flows (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: A multidomain approach for calculating compressible flows by using unsteady or pseudo-unsteady methods is presented. This approach is based on a general technique of connecting together two domains in which hyperbolic systems (that may differ) are solved with the aid of compatibility relations associated with these systems. Some examples of this approach's application to calculating transonic flows in ideal fluids are shown, particularly the adjustment of shock waves. The approach is then applied to treating a shock/boundary layer interaction problem in a transonic channel.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-76692 , NAS 1.15:76692
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Current developments lighter than air systems (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Lighter than air aircraft (LTA) developments and research in the United States and other countries are reviewed. The emphasis in the U.S. is on VTOL airships capable of heavy lift, and on long endurance types for coastal maritime patrol. Design concepts include hybrids which combine heavier than air and LTA components and characteristics. Research programs are concentrated on aerodynamics, flight dynamics, and control of hybrid types.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-84744 , NAS 1.15:84744
    Format: application/pdf
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  • 3
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    Experimental investigation of the flow on the suction side of a thin Delta wing (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Surface oil flow patterns were photographed and pressure distribution measurements were carried out on a sharp edged delta wing of aspect ratio lambda = 1.0 in order to determine the influence of Reynolds number and of vortex breakdown on the flow on the suction side of the wing. The formation of the secondary vortex occurs due to separation of a laminar boundary layer in the front part of the wing and due to separation of a turbulent boundary layer in the rear part of the wing. In the case of turbulent separation, the secondary separation line is closer to the wing leading edge than in the laminar case. The position of the transition depends on the Reynolds number and on the angle of incidence. The breakdown of a vortex above the wing leads to a kink in the secondary separation line.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75897
    Format: application/pdf
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  • 4
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    Aerodynamics on a transport aircraft type wing-body model (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The DFLR-F4 wing-body combination is studied. The 1/38 model is formed by a 9.5 aspect ratio transonic wing and an Airbus A 310 fuselage. The F4 wing geometrical characteristics are described and the main experimental results obtained in the S2MA wind tunnel are discussed. Both wing-fuselage interferences and viscous effects, which are important on the wing due to a high rear loading, are investigated by performing 3D calculations. An attempt is made to find their limitations.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-76878 , NAS 1.15:76878
    Format: application/pdf
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  • 5
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    Separation behavior of boundary layers on three-dimensional wings (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: An inverse boundary layer procedure for calculating separated, turbulent boundary layers at infinitely long, crabbing wing was developed. The procedure was developed for calculating three dimensional, incompressible turbulent boundary layers was expanded to adiabatic, compressible flows. Example calculations with transsonic wings were made including viscose effects. In this case an approximated calculation method described for areas of separated, turbulent boundary layers, permitting calculation of this displacement thickness. The laminar boundary layer development was calculated with inclined ellipsoids.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75877
    Format: application/pdf
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  • 6
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    A study of dirigibles for use in the Peruvian Selva Central region (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The potential for dirigibles as transports in the Selva Central region of Peru was evaluated by means of a mission and economic analysis. A total requirement to transport over 19 million tons (t) of agricultural produce, lumber and meat was projected by the year 2004. A primary route involving zones for loading and delivering this carbo was identified. Although dirigibles are capable of short field operation, all existing airfields must be enlarged in width to allow for all conditions of wind and weather and to provide space for overnight mooring. A maintenance base and operations headquarters, complete with hangar and other service facilities would be required. The quantities of cargo capacities of 5 to 100 tons were identified. Fleet sizes up to 106 dirigibles (in 20 t capacities) would be required. Dirigibles were assumed to be of the nonrigid type except in the 100 t category for which rigid characteristics were assumed. A method of determining dirigible costs was developed. The values derived were then applied to an economic analysis to determine initial investment and operating costs. It was found that larger dirigibles of approximately 20 t capacities or higher could offer significant cost benefits over airplanes, provided cruise speeds were higher than 100km/hr.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-85634 , NAS 1.15:85634
    Format: application/pdf
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  • 7
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    The calculation of separated flow at helicopter bodies (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: For abstract see A81-47555.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-76715 , NAS 1.15:76715
    Format: application/pdf
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  • 8
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    JBFA - buoyant flight (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: A method was developed whereby a balloon was used to carry lumber out of a forest in order to continue lumber production without destroying the natural environment and view of the forest. Emphasis was on the best shape for a logging balloon, development of a balloon logging system suitable for cutting lumber and safety plans, tests on balloon construction and development of netting, and weather of mountainous areas, especially solutions to problems caused by winds.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-76815 , NAS 1.15:76815
    Format: application/pdf
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  • 9
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    Successive smoothing algorithm for constructing the semiempirical model developed at ONERA to predict unsteady aerodynamic forces (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Unsteady aerodynamic methods adopted for the study of aeroelasticity in helicopters are considered with focus on the development of a semiempirical model of unsteady aerodynamic forces acting on an oscillating profile at high incidence. The successive smoothing algorithm described leads to the model's coefficients in a very satisfactory manner.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-76681 , NAS 1.15:76681
    Format: application/pdf
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  • 10
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    Highly separated transonic flows (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Attention is given to the wind tunnel, to photographic visualization of the flow, and to measurements by pressure probes, hot wire anemometry and laser anemometry. The simultaneous use of different means of measurement provided a good description of the phenomenon, and indicated the existence of shocks and their stability, as well as the existence of the bubble, its dimensions, and in particular, the reattachment of its front. The results show that the bursting (or transition) of the bubble front is produced at an unstable position and creates a point of turbulent intensity which diffuses over the entire height of the flow.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75874 , NT80-18 , Colloq. Aerodyn. Appl.; Nov 13, 1979 - Nov 15, 1979; Lille; France
    Format: application/pdf
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