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Showing 1 to 20 of 38 for “"ice accretion"”.
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Measuring ice accretion with a microwave radiometer.
Ice accretion inside jet engines is a major threat to modern aviation. Ice crystals in the atmosphere can be ingested by turbofan jet engines and build up inside reducing airflow through the engine. A reliable method to detect ice inside the engine before power loss occurs is needed. A passive …
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Hybrid Airfoil Design Methods for Full-Scale Ice Accretion Simulation
… or ""hybrid"" airfoils that simulate fullscale ice accretions. These subscale or hybrid airfoils have full-scale leading edges and redesigned aft-sections. A preliminary study to help develop a design philosophy for the design of hybrid airfoils showed that hybrid airfoils could be designed to …
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Quantitative analysis of ice accretion roughness using spectral and stochastic techniques
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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A method for replicating ice accretion roughness using multi-scale analog distributions.
… elements and 2) the interaction of the shed vortices with the next downstream roughness elements. An autocorrelation function was employed on a real ice surface to capture the root-mean-square-roughness height, the primary streamwise wavelength, and the aspect ratio of surface microscales. Two …
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Evaluating approaches to detecting ice accretion in and around turbofan jet engines.
The accumulation of ice crystals in the compressor stages of a jet engine causes power loss events during flight that could potentially become catastrophic. The electromagnetic properties of ice clouds make them nearly undetectable to radars and hence the need for a new sensing technique. A …
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Heat transfer measurements on surfaces with natural and simulated ice accretion roughness
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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A STUDY ON THE PHYSICS OF ICE ACCRETION IN A TURBOFAN ENGINE ENVIRONMENT
… thrust control events have led to a theory that ice is accreting on initially warmer than freezing internal engine hardware and affecting normal operation. The phenomenon is termed ice crystal icing. Previous ice crystal icing research on a simple airfoil empirically identified the effects of …
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On a Cartesian cut-cell methodology for simulating atmospheric ice accretion on aircraft
Atmospheric in-flight ice accretion has been a significant operational hazard in aviation for decades. Super-cooled water droplets impinge on exposed surfaces such as wings and rotor blades. These droplets may freeze on the surface thereby changing lift characteristics and disturb weight and …
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Improved ice growth modeling based on close-up analysis of aircraft ice accretion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Experimental and CFD Study of Wind-Induced Response for Bridge Cables with Ice accretion
… a new type of cable vibrations caused by ice accretion formed around the cable circumference. The current research proposed two ice accretion profiles for inclined bridge cables and has experimentally investigated the wind-induced vibrations of the two models for the bridge stay-cables …
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Validation of 3-D ice accretion documentation and replication method including pressure-sensitive paint
Accurate representation of ice accretions is important to the study and understanding of aircraft icing. For research and certification purposes, replicas of ice accretions generated from icing wind tunnels are fabricated to perform aerodynamic tests in dry-air wind tunnels. The currently employed …
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Large-scale swept-wing ice accretion modeling in the NASA Glenn Icing Research Tunnel using LEWICE3D
… throughout the design and certification of anti-ice systems. However, computational methods alone are not sufficient for aircraft certification. Icing wind tunnels are used for aircraft certification to reduce costs, provide a controlled test matrix of conditions, and validate computational icing …
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An experimental and theoretical study of the ice accretion process during artificial and natural icing conditions
Thesis (M.S.)--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics, 1986.
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Improved ice accretion prediction techniques based on experimental observations of surface roughness effects on heat transfer
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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MICE--a numerical tool for the study of ice accretion and its effect on multielement airfoils
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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An Experimental Study of the Flowfield on a Semispan Rectangular Wing With a Simulated Glaze Ice Accretion
The effect of a simulated glaze ice accretion on the flowfield of a semispan, reflection-plane, rectangular wing at Re = 1.5 million and M = 0.12 was investigated. A laser Doppler velocimeter was used to map the flowfield on the upper surface of the model in both the clean and iced configurations …
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An investigation of the heat transfer and transport mechanisms which control surface water during glaze ice accretion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Preliminary implementation of improved heat transfer and impingement-direction ice growth modeling in numerically simulated ice accretion (LEWICE/X
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Numerical Modeling of Anti-Icing Using an Array of Heated Synthetic Jets
… of SJA actuation with and without jet heating on ice accretion are studied using the FENSAP-ICE software. It is shown that the heated actuating SJAs can lead to a significant reduction in the amount of ice accreted on the surface. Additional parametric studies on several icing and SJA parameters …
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Use of hybrid airfoil design in icing wind tunnel tests of large scale swept wings
In-flight ice accretion is an important safety consideration for modern aircraft. The certification of commercial airliners for flight into known icing is difficult due to the expense and challenge in finding the desired icing conditions in flight. The large size of commercial aircraft relative to …
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