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Thursday, July 16, 2020 | History

2 edition of Spectral analysis and experimental modeling of ice accretion roughness found in the catalog.

Spectral analysis and experimental modeling of ice accretion roughness

Spectral analysis and experimental modeling of ice accretion roughness

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  • 3 Currently reading

Published by American Institute of Aeronautics and Astronautics, [National Aeronautics and Space Administration, National Technical Information Service, distributor in Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Spectrum analysis.,
  • Ice.,
  • Ice formation.,
  • Wind tunnel tests.,
  • Heat transfer.,
  • Surface roughness.,
  • Image processing.,
  • Quantitative analysis.

  • Edition Notes

    StatementD.J. Orr ... [et al.].
    Series[NASA contractor report] -- 112616., NASA contractor report -- NASA CR-112616.
    ContributionsOrr, D. J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15504786M

      The formulation accounts for the surface roughness due to ice accretion. The fourth step consists of establishing the thermodynamic balance and computing ice accretion rates using the Extended Messinger Model. At low temperatures and low liquid water contents, rime ice occurs for which the ice shape is determined by a simple mass by:   Sensitivity to roughness size and application technique on a low-fidelity smooth ice shape is described. The data indicate that the aerodynamic performance is not especially sensitive to the grit variations. An ice accretion code was also used to generate ice Cited by: 1.

      An understanding of ice-shape geometric fidelity and Reynolds and Mach number effects on iced-wing aerodynamics is needed to guide the development and validation of ice-accretion simulation tools. To this end, wind-tunnel testing was carried out for % and % scale semispan wing models based upon the Common Research Model airplane Cited by: 1. The natural ice accretion roughness was a sample casting made from accretions at the NASA Lewis Icing Research Tunnel (IRT). One of these castings was modeled using a Spectral Estimation Technique (SET) to produce three roughness elements patterns that simulate the actual accretion.

    In-flight ice accretion on aircraft surfaces, Aircraft gound icing by frost, Hair sensors and micro-pillars for unsteady flow detection, Gas turbine blade aerodynamics and cooling, Uncertainty analysis, Experimental techniques for surface temperature measurement and for flowfield velocity and temperature measurement. "An Experimental Investigation on the Dynamic Ice Accretion and Unsteady Heat Transfer over an Airfoil Surface with Embedded Initial Ice Roughness ”, International Journal of Heat a nd Mass Transfer, Vol, (11 pages),


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Spectral analysis and experimental modeling of ice accretion roughness Download PDF EPUB FB2

A self-consistent scheme for relating wind tunnel ice accretion roughness to the resulting enhancement of heat transfer is described. First, a spectral technique of quantitative analysis of early ice roughness images is reviewed. A self-consistent scheme for relating wind tunnel ice accretion roughness to the resulting enhancement of heat transfer is described.

First, a spectral technique of quantitative analysis of early. Get this from a library. Spectral analysis and experimental modeling of ice accretion roughness. [D J Orr; United States. National Aeronautics and Space Administration.;]. First, a spectral technique of quantitative analysis of early ice roughness images is reviewed.

The image processing scheme uses a spectral estimation technique (SET) which extracts physically descriptive parameters by comparing scan lines from the experimentally-obtained accretion images to a prescribed test : D.

Orr, K. Breuer, B. Torres, R. Hansman. objective of the present work is to model an ice accretion on an airfoil using a Messinger-based approach and to make a sensitivity analysis of roughness models on the ice shape. The test case will be performed on a 2D NACA airfoil.

A typical test case on a NACA airfoil under. roughness. To predict ice accretion rates on airfoil surfaces, ice accretion modeling codes such as LEWICE [11], must employ both a roughness geometry model and a convective enhancement model.

Given the limitations in the past ice roughness measurement processes, roughness geometry evolution modeling in many ice accretion codes is anFile Size: 4MB. In the present study, a comprehensive experimental study was conducted to evaluate the effects of initial ice roughness formed around the leading-edge of an airfoil model on the dynamic ice accretion and unsteady heat transfer processes over the airfoil by: 3.

An experimental investigation on the dynamic ice accretion and unsteady heat transfer over an airfoil surface with embedded initial ice roughness International Journal of Heat and Mass Transfer, Vol.

Cited by: An experimental investigation of dynamic ice accretion process on a wind turbine airfoil model considering various icing conditions International Journal of Heat and Mass Transfer, Vol. Mechanism study of coupled aerodynamic and thermal effects using plasma actuation for anti-icingCited by: Ice accretion was most likely the result of impinging ice particles that had already transformed into their solidified crystalline form.

The ice particles behaved most “sticky” between temperatures ranging from about −6°C to −20°C. The thickness of accreted ice increased with the degree of roughness for aluminium surfaces. by: 2. Analysis of Experimental Ice Accretion Data and Assessment of a Thermodynamic Model during Ice Crystal Icing This paper analyzes ice crystal icing accretion data and evaluates a thermodynamic ice crystal icing model, which has been previously presented, to describe the possible mechanisms of icing within the core of a turbofan jet Author: Tadas P Bartkus, Jen-Ching Tsao, Peter M Struk.

NASA Lewis Research Center Film, [6]Shin J. Characteristics of surface roughness associated with leading edge ice accretion: 32nd Aerospace Science Meeting&Exhibition[R]. Reno: [7]Fortin G. Prediction of 2D Airfoil Ice Accretion by Bisection Method and by Rivulet and Bead Modeling: 41st Aerospace Sciences Meeting and Exhibit[R].Cited by: 1.

Fig. 1 highlights the physical and modeling parameters that are critically involved in the ice accretion process on aircraft surfaces, including the well-known meteorological icing parameters (liquid water content (LWC), mean volumetric diameter (MVD), temperature) and flight conditions (velocity, altitude, exposure time).

Among five physical and modeling parameters, surface roughness is Author: L. Prince Raj, K. Yee, R.S. Myong. The ice flow-parallel-gridded spectral roughness (at a spatial resolution of m) varies substantially in the study area.

The northern part of the study area consists of an undulating topography with variable roughness. In particular, low roughness occurs in the Kangerlussuaq fjord area, the Isunnguata Sermia overdeepened area, and in some areas of the interior beneath the ice by: transfer between air and wing.

In er,[4] studied the ice accretion on the cylinder. By studying the effect of ice roughness on the final ice shape and comparing the experimental ice shapes with simulation results, a set of calculation formulas about the ice surface roughness in different icing.

New Roughness Computation Method and Geometric Accretion Model for Airfoil Icing. Experimental and Computer Model Results for a Carbon Nanotubes Electrothermal De-Icing System.

10 June Measurement and correlation of ice accretion by: if roughness features scale with model size or with liquid-water content when appropriate scaling methods are used.

NACA airfoils with chords ofand cm were tested with glaze-ice conditions for icing times from 14 – sec. The ice roughness characteristics were recorded photographically for later analysis.

Roughness determines many functional properties of surfaces, such as adhesion, friction, and (thermal and electrical) contact conductance. Recent analytical models and simulations enable quantitative prediction of these properties from knowledge of the power spectral density (PSD) Cited by: 2.

Analysis of Experimental Ice Accretion Data and Assessment of a Thermodynamic Model during Ice Crystal Icing. In-Cloud Ice Accretion Modeling on Wind Turbine Blades Using an Extended Messinger Model. Measurement and correlation of ice accretion by: A thorough validation of the full roughness model, including CFD code coupling and ice accretion, is more difficult to perform due to the lack of suitable quantitative experimental measurements on.

Ice accretion model based on Stefan problem was solved to simulate the film flow on the icing surface. This roughness extension model is applied to predict the skin friction coefficient and.An Experimental Study on the Dynamic Ice Accretion Processes on Bridge Cables with Different Surface Modifications 10 June Topographic study of the ice accretion roughness on a generic aero-engine by:   However, for glaze ice, the results do not agree well with experimental data.

For a realistic ice accretion, it is essential to include the microphysical aspect of ice, model accurately the Author: Nicolas Pellerin.