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  • 1
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    Heat transfer on accreting ice surfaces (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Based on previous observations of glaze ice accretion, a 'Multi-Zone' model with distinct zones of different surface roughness is demonstrated. The use of surface roughness in the LEWICE ice accretion prediction code is examined. It was found that roughness is used in two ways: to determine the laminar to turbulent transition location and to calculate the turbulent heat transfer coefficient. A two zone version of the Multi-Zone model is implemented in the LEWICE code, and compared with experimental heat transfer coefficient and ice accretin results. The analysis of the boundary layer transition, surface roughness, and viscous flow field effects significantly increased the accuracy in predicting heat transfer coefficients. The Multi-Zone model was found to greatly improve the ice accretion prediction for the cases compared.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 90-0200
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of surface roughness generation in aircraft ice accretion (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Patterns of roughness evolution have been studied analysis of high magnification video observations of accreting ice surfaces provided by the NASA Lewis Research Center. Three distinct patterns of surface roughness generation have been identified within the parametric regions studied. They include: Rime, Multi-Zone Glaze, and Uniform Glaze. Under most icing conditions, a brief period of transient rime ice growth was observed caused by heat conduction into the body. The resulting thin rime layer explains previously observed insensitivity of some ice accretions to substrate insensitivity of some ice accretions to substrate surface chemistry and may provide justification for simplifying assumptions in ice accretion sailing and modeling effects.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-0298
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Experimental measurements of heat transfer from an iced surface during artificial and natural cloud icing conditions (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The heat transfer behavior of accreting ice surfaces in natural (flight test) and simulated (wind tunnel) cloud icing conditions were studied. Observations of wet and dry ice growth regimes as measured by ultrasonic pulse echo techniques were made. Observed wet and dry ice growth regimes at the stagnation point of a cylinder were compared with those predicted using a quasi steady state heat balance model. A series of heat transfer coefficients were employed by the model to infer the local heat transfer behavior of the actual ice surfaces. The heat transfer in the stagnation region was generally inferred to be higher in wind tunnel icing tests than in natural flight icing conditions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA-86-1352 , AIAA PAPER 86-1352 , NASA, Langley Research Center, Joint University Program for Air Transportation Research, 1986; p 17-26
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of aircraft performance during lateral maneuvering for microburst avoidance (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Aircraft response to a severe and a moderate three-dimensional microburst model using nonlinear numerical simulations of a Boeing 737-100 is studied. The relative performance loss is compared for microburst escape procedures with and without lateral maneuvering. The results show that the hazards caused by the penetration of a microburst in the landing phase are attenuated if lateral escape maneuvers are applied in order to turn the aircraft away from the microburst core rather than flying straight through. If the lateral escape maneuver is initiated close to the microburst core, high bank angles tend to deteriorate aircraft performance. Lateral maneuvering is also found to reduce the advanced warning required to escape from microburst hazards but requires that information of the existence and location of the microburst is available (i.e., remote detection) in order to avoid an incorrect turn toward the microburst core.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AIAA PAPER 90-0568
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Dynamic response of aircraft autopilot systems to atmospheric disturbances (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: Journal of Aircraft (ISSN 0021-8669); 26; 124-130
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Heat transfer on accreting ice surfaces (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Aircraft (ISSN 0021-8669); 29; 108-113
    Format: text
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    NASA TECHNICAL REPORTS
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