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  • AERODYNAMICS  (102)
  • Aircraft Stability and Control
  • GENERAL
  • 2005-2009
  • 1985-1989  (107)
  • 1988  (107)
  • 11
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    Numerical investigation of a jet in ground effect using the fortified Navier-Stokes scheme (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: One of the flows inherent in VSTOL operations, the jet in ground effect with a crossflow, is studied using the Fortified Navier-Stokes (FNS) scheme. Through comparison of the simulation results and the experimental data, and through the variation of the flow parameters (in the simulation) a number of interesting characteristics of the flow have been observed. For example, it appears that the forward penetration of the ground vortex is a strong inverse function of the level of mixing in the ground vortex. Also, an effort has been made to isolate issues which require additional work in order to improve the numerical simulation of the jet in ground effect flow. The FNS approach simplifies the simulation of a single jet in ground effect, but it will be even more effective in applications to more complex topologies.
    Keywords: AERODYNAMICS
    Type: The 1987 Ground Vortex Workshop; p 191-206
    Format: application/pdf
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  • 12
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    Summary of an experimental investigation on the ground vortex (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The results of an experimental investigation into the position and characteristics of the ground vortex are summarized. A 48-inch wind tunnel was modified to create a testing environment suitable for the ground vortex study. Flow visualization was used to document the jet-crossflow interaction and a two-component Laser Doppler Velocimeter (LDV) was used to survey the flowfield in detail. Measurements of the ground vortex characteristics and location as a function of freestream-to-jet velocity ratio, jet height, pressure gradient and upstream boundary layer thickness were obtained.
    Keywords: AERODYNAMICS
    Type: NASA, Ames Research Center, The 1987 Ground Vortex Workshop; p 39-60
    Format: application/pdf
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  • 13
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    Aeroelastic modeling of rotor blades with spanwise variable elastic axis offset: Classic issues revisited and new formulations (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In response to a systematic methodology assessment program directed to the aeroelastic stability of hingeless helicopter rotor blades, improved basic aeroelastic reformulations and new formulations relating to structural sweep were achieved. Correlational results are presented showing the substantially improved performance of the G400 aeroelastic analysis incorporating these new formulations. The formulations pertain partly to sundry solutions to classic problem areas, relating to dynamic inflow with vortex-ring state operation and basic blade kinematics, but mostly to improved physical modeling of elastic axis offset (structural sweep) in the presence of nonlinear structural twist. Specific issues addressed are an alternate modeling of the delta EI torsional excitation due to compound bending using a force integration approach, and the detailed kinematic representation of an elastically deflected point mass of a beam with both structural sweep and nonlinear twist.
    Keywords: AERODYNAMICS
    Type: NASA, Ames Research Center, Integrated Technology Rotor Methodology Assessment Workshop; p 217-22
    Format: application/pdf
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  • 14
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    Viscous transonic airfoil workshop compendium of results (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 25; 1073-108
    Format: text
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  • 15
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    Analytical modeling of helicopter static and dynamic induced velocity in GRASP (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The methodology used by the General Rotorcraft Aeromechanical Stability Program (GRASP) to model the characteristics of the flow through a helicopter rotor in hovering or axial flight is described. Since the induced flow plays a significant role in determining the aeroelastic properties of rotorcraft, the computation of the induced flow is an important aspect of the program. Because of the combined finite-element/multibody methodology used as the basis for GRASP, the implementation of induced velocity calculations presented an unusual challenge to the developers. To preserve the modelling flexibility and generality of the code, it was necessary to depart from the traditional methods of computing the induced velocity. This is accomplished by calculating the actuator disk contributions to the rotor loads in a separate element called the air mass element, and then performing the calculations of the aerodynamic forces on individual blade elements within the aeroelastic beam element.
    Keywords: AERODYNAMICS
    Type: Vertica (ISSN 0360-5450); 12; 4, 19; 337-344
    Format: text
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  • 16
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    Euler solution of multiblade rotor flow (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A numerical method for solving the Euler equations for multiblade rotors has been developed and some preliminary results reported. The numerical scheme is a combination of several recent methods and algorithm improvements, adapted to the particular requirements of rotor-body interactions. A cylindrical basic grid has been used to study conventional multiblade helicopter rotors. Test calculations have been made for two- and six-blade rotors in hover and for a two-blade rotor in forward flight, under transonic tip conditions but without lift. The results show good agreement with experimental data.
    Keywords: AERODYNAMICS
    Type: Vertica (ISSN 0360-5450); 12; 3, 19; 303-313
    Format: text
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  • 17
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    Historical annotated bibliography: Space Station documents (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Information is presented regarding documentation which has been produced in the Space Station program. This information will enable the researcher to locate readily documents pertinent to a particular study. It is designed to give the historian the necessary data from which to compile the written histories and to preserve records of historically significant aspects of Marshall's involvement in Space Shuttle and Space Station.
    Keywords: GENERAL
    Type: NASA-CR-184012 , NAS 1.26:184012 , MHR-13
    Format: application/pdf
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  • 18
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    Chronology: MSFC Space Shuttle program development, assembly, and testing major events (1969 - April, 1981) (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Listings of major events directly related to the Space Shuttle Program at Marshall Space Flight Center (MSFC) are presented. This information will provide the researcher with a means of following the chronological progression of the program. The products that the historians have prepared are intended to provide supportive research essential to the writing of formal narrative histories of Marshall's contributions to the Space Shuttle and Space Station.
    Keywords: GENERAL
    Type: NASA-CR-184013 , NAS 1.26:184013 , MHR-15
    Format: application/pdf
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  • 19
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    Chronology: MSFC Space Station program, 1982 - present. Major events (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Marshall Space Flight Center (MSFC) maintains an active program to capture historical information and documentation on the MSFC's roles regarding Space Shuttle and Space Station. Marshall History Report 12, called Chronology: MSFC Space Station Program, 1982-Present, is presented. It contains synopses of major events listed according to the dates of their occurrence. Indices follow the synopses and provide additional data concerning the events listed. The Event Index provides a brief listing of all the events without synopses. The Element Index lists the specific elements of the Space Station Program under consideration in the events. The Location Index lists the locations where the events took place. The indices and synopses may be cross-referenced by using dates.
    Keywords: GENERAL
    Type: NASA-CR-184014 , NAS 1.26:184014 , MHR-12
    Format: application/pdf
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  • 20
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    Detailed flowfield measurements over a 75 deg swept delta wing for code validation (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Selected results from an experimental investigation documenting the flowfield over 75 deg swept delta wing at an angle-of-attack of 20.5 deg are presented. Results obtained in the investigation include surface flow visualization, off-body flow visualization, and detailed flowfield surveys for various Reynolds numbers. Flowfield surveys at Reynolds numbers of 0.5, 1.0 and 1.5 million were conducted with both a pitot pressure probe and a 5-hole pressure probe; and 3-component laser Doppler velocimeter surveys were conducted at a Reynolds number of 1.0 million. The pitot pressure surveys were obtained at 5 longitudinal stations, the 5-hole probe surveys were obtained at 3 longitudinal stations and the laser Doppler velocimeter surveys were obtained at one station. The accuracy of each instrumentation system is discussed, as well as, discrepancies in the calculation of vorticity using various algorithms.
    Keywords: AERODYNAMICS
    Type: AGARD, Validation of Computational Fluid Dynamics. Volume 2: Poster Papers; 14 p
    Format: text
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