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  • Weitere Quellen  (1.114)
  • AERODYNAMICS  (700)
  • INSTRUMENTATION AND PHOTOGRAPHY  (414)
  • 1990-1994  (1.114)
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  • 1992  (1.114)
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  • 1
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    Hot wire/film behavior in low-temperature gases (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Commercially available hot wires/films were used to measure the velocities of evaporated hydrogen or helium gas during cryogenic mixing experiments. Hot wires were found to be too delicate to use in this harsh environment. Hot films were rugged enough to use at cryogenic temperatures even though they failed after a number of thermal cycles. Since the hot films have small aspect ratios, 13.4 and 20, they are quite sensitive to the thermal loading, Tw/Tg, even with a correction for the conduction end loss. In general, although the increase of the Nusselt number with Reynolds number at low temperatures was similar to that at room temperature, there was also a pronounced variation with Tw/Tg over the large range of 1.2 to 12 investigated.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: ASME, Transactions, Journal of Heat Transfer (ISSN 0022-1481); 114; 4; p. 859-865.
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  • 2
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    Longitudinal vortex control - Techniques and applications (The 32nd Lanchester Lecture) (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: A summary is presented of vortex control applications and current techniques for the control of longitudinal vortices produced by bodies, leading edges, tips and intersections. Vortex control has up till now been performed by many approaches in an empirical fashion, assisted by the essentially inviscid nature of much of longitudinal vortex behavior. Attention is given to Reynolds number sensitivities, vortex breakdown and interactions, vortex control on highly swept wings, and vortex control in juncture flows.
    Schlagwort(e): AERODYNAMICS
    Materialart: Aeronautical Journal (ISSN 0001-9240); 96; 958; p. 293-312.
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Unsteady two- and three-dimensional Navier-Stokes simulations of multistage turbomachinery flows (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: The flow-field within an axial flow turbomachine, such as a turbine or compressor, is extremely complex because of three-dimensional features such as hub-corner stall, tip-leakage flows, and airfoil wakes. These flow features interact with each other and with rotor and stator airfoils inducing time-varying forces on the airfoils. These complicated rotor-stator interactions must be understood in order to design turbomachines that are light and compact as well as reliable and efficient. Two codes, STAGE-2 and STAGE-3, have been developed to compute these unsteady rotor-stator interaction flows in multistage turbomachines. An implicit, thin-layer Euler/Navier-Stokes zonal algorithm is used to compute the unsteady flow-field within both turbine and compressor configurations. Results include surface pressures and wake profiles for two-dimensional turbine and compressor configurations and surface pressures for a three-dimensional single-stage turbine configuration. The results compare well with experimental data and other unsteady computations.
    Schlagwort(e): AERODYNAMICS
    Materialart: Computing Systems in Engineering (ISSN 0956-0521); 3; 1-4; p. 231-240.
    Format: text
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  • 4
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    Numerical simulation of jet noise (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Jet noise and jet-induced structural loads have become key issues in the design of commercial and military aircraft. Computational Fluid Dynamics (CFD) can be of use in predicting the underlying jet shear-layer instabilities and, in conjunction with classical acoustic theory, jet noise. The computational issues involved in the resolution of high Reynolds number unsteady jet flows are addressed in this paper. Once these jet flows can be accurately resolved, it should be possible to use acoustic theory to extract, for example, the far-field jet noise. An assessment of future work and computational resources required for directly computing far-field jet noise is also presented.
    Schlagwort(e): AERODYNAMICS
    Materialart: Computing Systems in Engineering (ISSN 0956-0521); 3; 1-4; p. 169-179.
    Format: text
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  • 5
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    Temporal averaging in a turbulent environment - Compensation for phase drifts in phase shifting interferometry (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: In an effort to improve the signal to noise in an interference experiment, we have developed a method to remove systematic phase drift between data sets acquired over long time intervals. Using this technique, it is possible to average repeatedly acquired phase measurements and improve the phase estimate without sacrificing spatial resolution. Results from tests using real-time phase stepping holographic interferometry applied to cantilever bending of a piezoelectric bimorph indicate that white noise has been reduced from 3 to less than 1 deg (lambda/360) by averaging 36 phase compensated data sets before object bending and 36 data sets after bending.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: In: Laser interferometry IV: Computer-aided interferometry; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-44185 18-35); p. 221-230.
    Format: text
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  • 6
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    Supersonic laminar flow control (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: A development status evaluation is presented for the theoretical understanding and design conceptualization of boundary layer control (BLC) systems applicable to supersonic transports, such as the currently envisioned NASA High Speed Civil Transport. By reducing fuel burned, supersonic BLC techniques could expand ranges to Pacific-crossing scales, while lowering sonic boom effects and upper-atmosphere pollution and even reducing skin friction temperature. The critical consideration for supersonic BLC is the presence of wave effects.
    Schlagwort(e): AERODYNAMICS
    Materialart: In: Natural laminar flow and laminar flow control (A93-41776 17-02); p. 233-245.
    Format: text
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  • 7
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    Wave interaction theory and LFC (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Attention is drawn to the influence of preexisting finite-amplitude instabilities on the growth of other disturbances; current design tools for LFC take no notice of this kind of interaction. When a rational accounting is accomplished for the evolution of incoming disturbances in finite-amplitude solutions of the equations of motion, future transition-prediction methods will need to take these wave interactions into account. Attention is given here to interactions in the presence of crossflow vortices and interactions involving Goertler vortices.
    Schlagwort(e): AERODYNAMICS
    Materialart: In: Natural laminar flow and laminar flow control (A93-41776 17-02); p. 223-232.
    Format: text
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  • 8
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    Laminar flow control - Introduction and overview (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: A development history and a development-trends evaluation are presented for laminar flow controlled airfoil technologies and design concepts, including the search for 'natural' laminar flow and actively controlled flow via suction through small pores on the airfoil surface. While most NASA activities in this field have been concerned with subsonic aircraft, it has been projected that the control of boundary layer turbulence may be even more critical to the aerodynamic efficiency of supersonic aircraft. Developmental programs for these techniques have been conducted with several modified conventional aircraft.
    Schlagwort(e): AERODYNAMICS
    Materialart: In: Natural laminar flow and laminar flow control (A93-41776 17-02); p. 1-21.
    Format: text
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  • 9
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    Subsonic natural-laminar-flow airfoils (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: An account is given of the development history of natural laminar-flow (NLF) airfoil profiles under guidance of an experimentally well-verified theoretical method for the design of airfoils suited to virtually all subcritical applications. This method, the Eppler Airfoil Design and Analysis Program, contains a conformal-mapping method for airfoils having prescribed velocity-distribution characteristics, as well as a panel method for the analysis of potential flow about given airfoils and a boundary-layer method. Several of the NLF airfoils thus obtained are discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: In: Natural laminar flow and laminar flow control (A93-41776 17-02); p. 143-176.
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The Objective Double Crystal Spectrometer (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: The solar corona, supernova remnants, the hot diffuse interstellar gas in the Galaxy, galactic halos, and the hot intracluster gas in rich clusters of galaxies, are examples of extended astrophysical plasmas which emit line-rich spectra in the X-ray spectral range from 1.5 to 25 A. These phenomena represent a significant fraction of the baryonic matter in the universe. The study of the composition, structure and dynamics of these astrophysical plasmas requires observations with both high spectral and spatial resolution simultaneously. The Objective Double Crystal Spectrometer, coupled with a grazing incidence X-ray telescope, represents a stigmatic instrument which is highly efficient for the study of such sources. We describe the configuration and performance (spatial resolution, spectral resolution and efficiency) of the Objective Double Crystal spectrometer.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: In: Multilayer and grazing incidence X-ray(EUV optics; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-39658 15-74); p. 461-470.
    Format: text
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