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Tuesday, August 4, 2020 | History

3 edition of Surface roughness due to residual ice in the use of low power deicing systems found in the catalog.

Surface roughness due to residual ice in the use of low power deicing systems

Surface roughness due to residual ice in the use of low power deicing systems

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Published by NASA in [Washington, D.C.] .
Written in English

    Subjects:
  • Airplanes -- Ice prevention.,
  • Deicing chemicals.,
  • Drag (Aerodynamics)

  • Edition Notes

    StatementJaiwon Shin and Thomas H. Bond.
    SeriesNASA technical memorandum -- 105971., NASA technical memorandum -- 105971.
    ContributionsBond, Thomas H., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination14 p.
    Number of Pages14
    ID Numbers
    Open LibraryOL14700901M

    Smooth air and poor visibility due to fog, haze, or low clouds. After cycling of the deicing boots, residual ice will. increase as the airspeed or temperature decreases. Ice on the surface of the wing is virtually undetectable and causes a reduction in lift over the wing. weeping wing systems or TKS systems. Most aircrafts use one or a combination of rain control systems, what are they? windshield wipers, chemical rain repellent, pneumatic rain removal (jet blast), or windshields treated with a hydrophobic surface seal coating.

    Ice accretion on wind turbine blades can affect both the energy production and the lifetime of the wind turbine. Ice accumulation on blades reduces wind turbine power due to airfoil shape alteration and increased surface roughness [].This disrupts the airflow, increases drag, and reduces lift [2, 3, 4].In severe meteorological conditions, ice accretion on the blades can cause downtime for days. The current boundary layer developed along the lower surface of the sea ice is always in the hydrodynamically rough regime. Finally, the large deviation of results obtained from different sites indicates that the roughness length and resistance coefficient of sea ice may vary with the macroscale of the boundary layer and the surface condition.

    n q is the specific speed based on speed n in rpm, discharge Q in m 3 /sec and head H in meters. Any characteristic velocity like u 2 the peripheral velocity at the runner diameter at exit can be taken to calculate R e as only the ratio of R e is involved and velocity ratio is constant in homologous turbines. Equation [1] gives the efficiency of hydraulically smooth prototype turbines.   The adhesion strength of ice Ih, which is the relevant ice phase for anti-icing applications, depends on many factors. These factors include the surface chemistry, the surface roughness profile, the elastic modulus, the temperature, and the ice micro-structure. 5,27 5. S.


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Surface roughness due to residual ice in the use of low power deicing systems Download PDF EPUB FB2

Was obtained from low power ice protection systems tests conducted in the Icing Research Tunnel at NASA Lewis Research Center (LeRC) with nine different deicing systems. Results show that roughness associated with residual ice is not characterized by uniformly distributed roughness.

Results also show that deicing systems require a critical mass of ice to generate a. Get this from a library. Surface roughness due to residual ice in the use of low power deicing systems. [Jaiwon Shin; Thomas H Bond; United States.

National Aeronautics and Space Administration.; Lewis Research Center.]. Thicknesses of residual ice are presented to provide information on surface contamination and associated roughness during deicing events.

Data was obtained from low power ice protection systems tests conducted in the Icing Research Tunnel at NASA Lewis Research Center (LeRC) with nine different deicing : Thomas H. Bond and Jaiwon Shin. Rotor Broadband Noise Due to Surface Roughness during Ice Accretion.

Surface roughness due to residual ice in the use of low power deicing systems. JAIWON SHIN and Modeling of surface roughness effects on glaze ice accretion.

John Hansman Jr. Thicknesses of residual ice are presented to provide information on surface contamination and associated roughness during deicing events.

Data was obtained from low power ice protection. Transient Heat Transfer Measurements of Surface Roughness due to Ice Accretion. Surface Roughness and Heat Transfer Improved Predictions for Aircraft Ice-Accretion Modeling. Recommended. Surface roughness due to residual ice in the use of low power deicing systems.

Shin, T. Bond, Surface roughness due to residual ice in the use of low power deicing systems, 31st Aerospace Sciences Meeting & Exhibit, Reno, NV, 11 to 14 January A. Meuler. Surface roughness due to residual ice in the use of low power deicing systems with nine different deicing systems.

Results show that roughness associated with Due to the finite aperture of. Furthermore, several effective deicing cycles of the two systems are observed during the wind-tunnel test, indicating the rationality of the preliminary design.

The average and standard deviations of the experimental and numerical results are andrespectively, which verify the accuracy of the dynamic simulation model.

A surface having high wettability tends to allow the water drop to spread over a relatively wide area thereby wetting the surface. The work of adhesion (W) on the surfaces can be calculated by using Young-Dupre's equation, (1) W s l = γ l a (1 + cos θ) where W sl is the work of adhesion between solid and liquid surface and γ la is the liquid–air interfacial surface tension.

Low-Power Consuming Piezoelectric Deicing Systems. Electromechanical systems seem to be a valid way to lower the power consumption, even if specific zones like the leading edge stagnation point are difficult to treat this way because of the adverse action of aerodynamic loads which tends to press, and then preserve, the ice on the airfoil.

Journal of Propulsion and Power; Journal of Spacecraft and Rockets; Journal of Thermophysics and Heat Transfer; Surface roughness due to residual ice in the use of low power deicing systems. Further developments in three-dimensional simulation of electrothermal deicing systems.

1. Introduction. Ice accumulating and adhering on solid surfaces can cause various problems in power transmission lines, roads, boats, and aircrafts, which could result in severe accidents and large economic losses.Therefore, a fundamental understanding of the factors that affect ice adhesion on a solid surface is essential for reducing ice adhesion and for the optimal design of.

Journal of Aircraft Vol. 29, No. 6 November Surface roughness due to residual ice in the use of low power deicing systems.

JAIWON SHIN and. THOMAS BOND. 31st Aerospace Sciences Meeting August Full two-dimensional transient solutions of electrothermal aircraft blade deicing.

MASIULANIEC, T. KEITH, JR. Shin, T. Bond, Surface roughness due to residual ice in the use of low power deicing systems, paper presented at the 31st Aerospace Sciences Meeting and Exhibit, Reno, NV, 01 January Surface roughness due to residual ice in the use of low power deicing systems Data was obtained from low power ice protection systems tests conducted in.

Ice accretion has a negative impact on critical infrastructure, as well as a range of commercial and residential activities. Icephobic surfaces are defined by an ice adhesion strength τ ice ice requires much lower values of τ ice, such as on airplane wings or power lines (τ ice low τ ice values are scarcely reported, and robust.

Ice accumulation is an important issue not only for aircraft, but also for other systems like wind power structures (Dalili et al., ). Ice accretion causes a disruption of the aerodynamics by increasing surface roughness and drag coefficients, and decreases fatigue life (Jasinski et al., ; Antikainen and Peuranen, ; Talhaug et al.

1. Introduction. Ice formation and accretion can cause huge problems for aircrafts, ships, electrical transmission cables, wind turbines, motor vehicles et al.It demands a significant amount of energy and time to clear the ice away once uently, designing and deploying material surfaces that can assist the removal of ice have received growing interests.

The Anti-icing Materials International Laboratory (AMIL) has been testing SAE AMS and AMS ground de-icing/anti-icing fluids for more than 30 years. With the introduction of new surface coatings and their investigation as potential passive ice protection systems, or for hybrid use with other methods, it is important to understand their interaction with the ground de-icing/anti-icing.

1 () - Prior to installation of a pneumatic surface-bonded type deicer boots, on the leading edge of the wing, you should A- remove all paint from the area to be covered by the deicer boot.

2 () - Which of the following are found in a laminated integral electrically heated windshield system?1.Surface Roughness Due to Residual Ice in the Use of Low Power Deicing Systems", (). The Flow and Solidification of a Thin Fluid Film on an Arbitrary Three-Dimensional Surface".A Hybrid Anti-icing Ice Protection System.

35th Aerospace Sciences Meeting & Exhibit, Jan, Reno NV. Thermo-Mechanical Expulsion Deicing System. Presentation at SAE International conference Surface Roughness Due to Residual Ice in the Use of Low Power Deicing Systems.

31st Aerospace Sciences Meeting & Exhibit, Jan, Reno NV.