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  • 1
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    Jet decay rate effects on hover jet-induced loads (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper explains the mechanisms for observed jet decay rate effects on jet-induced loads on a flat plate for cross-flow and hover configurations. Examples are presented for the influence of the decay rate on integrated loads on a flat plate induced by the jet issuing at a right angle from the plate into still air; knowledge of these jet-induced loadings is of particular importance for VTOL aircraft design because they produce an effective loss in the lift force available in hover. The apparent inconsistency between existing lift loss vs jet decay rate trends is explained in light of the different mechanism which determine the jet mixing and trajectory, i.e., entrainment, blockage, and the vortex pair associated with a jet in crossflow.
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft; 17; Aug. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Experimental investigation of effect of jet decay rate on jet-induced pressures on a flat plate (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An experimental study of the interaction between a lift jet and an aircraft wing for a jet VTOL aircraft was performed for the simplified model of an unheated, subsonic, circular jet exiting at right angles to a flat plate into a uniform subsonic crosswind. The effects of jet dynamic pressure decay rate upon the jet location and jet induced pressure distribution on the plate were studied over a range of jet to crossflow velocity ratios of 2.2 or = R or = 10. Jet decay rate was varied through use of cylindrical centerbodies with flat or hemispherical tips submerged in the jet nozzle at various depths below the jet exit plane. Quicker jet dynamic pressure decay, caused by the presence of a centerbody, resulted in reductions in the jet induced lift loss by as much as 45 percent relative to values for jets with no centerbody. These reductions in lift loss were observed at the larger values of crossflow velocity.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-2979
    Format: application/pdf
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  • 3
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    Effects of jet decay rate on jet induced loads on a flat plate (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Experimental modelling of the interaction between a jet and an aircraft wing or fuselage in VTOL aircraft was undertaken using a cold jet exiting perpendicular to a flat plate in a uniform cross-flow. Effects of jet decay rate and jet-to-cross-flow velocity ratio, R, on the induced load distribution were investigated. Jet decay rate was increased by using cylindrical centerbodies submerged in the jet nozzle, which caused nonuniform initial jet velocity profiles. Quicker jet decay rate, corresponding to the presence of a centerbody, resulted in as much as 50% reduction in the induced pressure loads on the plate. This has implications in interpretation of results from earlier VTOL model studies of jet induced loads, where the jets have often had relatively slow decay rates due to uniform initial velocity profiles
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 77-596 , V/STOL Conference; Jun 06, 1977 - Jun 08, 1977; Palo Alto, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Experimental investigation of effects of jet decay rate on jet-induced pressures on a flat plate: Tabulated data (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Tabular data are presented for an experimental study of the effects of jet decay rate on the jet-induced pressure distribution on a flat plate for a single jet issuing at right angle to the flat plate into a uniform crossflow. The data are presented in four sections: (1) presents the static nozzle calibration data; (2) lists the plate surface static pressure data and integrated loads; (3) lists the jet centerline trajectory data; and (4) lists the centerline dynamic pressure data.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-158990
    Format: application/pdf
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  • 5
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    Experimental investigation of jet-induced loads on a flat plate in hover out-of-ground effect (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Effects of varying jet decay rate on jet-induced loads on a flat plate located in the plane of the jet exit perpendicular to the jet axis were investigated using a small-scale laboratory facility. Jet decay rate has been varied through use of two cylindrical centerbodies having either a flat or hemispherical tip, which were submerged various distances below the flat plate jet exit plane. Increased jet decay rate, caused by the presence of a center-body or plug in the jet nozzle, led to an increased jet-induced lift loss on the flat plate. Jet-induced lift losses reached 1 percent of the jet thrust for the quickest jet decay rates for plate areas equal to 100 times the effective jet exit area. The observed lift loss versus jet decay rate trend agreed well with results of previous investigations.
    Keywords: AERODYNAMICS
    Type: NASA-CR-159004
    Format: application/pdf
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