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Wednesday, July 29, 2020 | History

3 edition of Predictions if airfoil aerodynamic performance degradation due to icing found in the catalog.

Predictions if airfoil aerodynamic performance degradation due to icing

Robert J. Shaw

Predictions if airfoil aerodynamic performance degradation due to icing

by Robert J. Shaw

  • 230 Want to read
  • 6 Currently reading

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Aerodynamics.

  • Edition Notes

    StatementRobert J. Shaw, Mark G. Potapczuk and Colin S. Bidwell.
    SeriesNASA technical memorandum -- 101434.
    ContributionsPotapczuk, Mark G., Bidwell, Colin S., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14664180M

    Numerical analysis of aerodynamic noise mitigation via leading edge serrations for a rod–airfoil configuration Bharat Raj Agrawal and Anupam Sharma Abstract Noise produced by aerodynamic interaction between a circular cylinder (rod) and an airfoil in a tandem arrangement is investigated numerically using incompressible large eddy by: stepped airfoil with backward facing steps; apply active flow control technique to enhance the aerodynamic performance of stepped airfoils and examine the possibility of using such airfoils on Unmanned Aerial Vehicles (UAV’s). A step was introduced at mid-chord, with a depth of 50% of.

    most severe performance degradation [8]. Under this icing condition, a ridge ice accretion was protuberance size, shape, and location produced a more severe degradation in aerodynamic performance and control than another. This may have been due to the limited scope of the work on the iced airfoil predictions since no flap deflection. similar to the environment of a small unmanned aerial. Self-noise predictions systemare plotted with lift coefficient for a series of camber and thickness changes. The boundary layer was tripped and left untripped to understand the effect boundary layer on airfoil noise versus airfoil aerodynamic transition has by: 8.

    From Summary: "The effects of ice formations on the section lift, drag, and pitching-moment coefficients of an unswept NACA 65A airfoil section of 6-foot chord were studied.. The magnitude of the aerodynamic penalties was primarily a function of the shape and size of the ice formation near the leading edge of the airfoil. The exact size and shape of the ice formations Cited by: included, the aerodynamic center is not in general a single point as predicted by traditional thin airfoil theory, but is a function of angle of attack. Differences between nonlinear predictions and those based on thin airfoil theory are on the order of %, which can be significant when predicting aircraft by: 2.


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Predictions if airfoil aerodynamic performance degradation due to icing by Robert J. Shaw Download PDF EPUB FB2

One of the major elements of the NASA Aircraft Icing Research Program is the development and validation of a series of mutually compatible computer codes which predict the details of an aircraft Predictions of Airfoil Aerodynamic Performance Degradation Due to Icing | SpringerLinkCited by: 8.

Get this from a library. Predictions of airfoil aerodynamic performance degradation due to icing. [Robert J Shaw; Mark G Potapczuk; Colin S Bidwell; United States.

National Aeronautics and Space Administration.]. {De Gregorio}, A. Ragni, M. Airoldi, G. Romano: {PIV} investigation on airfoil with Predictions if airfoil aerodynamic performance degradation due to icing book accretion and resulting performance degradation, in Proc.

19th ICIASF () pp. 94– Google Scholar G. Mingione, V. Brandi: Ice accretion predictions on multielement airfoils, J. Aircr – () CrossRef Google ScholarCited by: 6. Effect of film cooling on the aerodynamic performance of an airfoil Article (PDF Available) in International Journal of Heat and Fluid Flow 66(august )–.

Aerodynamics performance degradation of the iced airfoil has been studied and it is shown that double horn ice accretion, due to its unique geometry, severely affects aerodynamic characteristics.

NASA Lewis Research Center. Pressure distribution over airfoil surfacewas evaluated at angles of attack between -2 to 6 degreesfor both iced and clean airfoils. Aerodynamics performance degradation of the iced airfoil has been studied and it is shown that double horn ice accretion, due to its unique geometry, severelyCited by: 1.

Aerodynamic Performance of the NREL S Airfoil in Icing Conditions Julie Krøgenes 1, Lovisa Brandrud 1, Richard Hann 2, Jan Bartl 1, Tania Bracchi 1, and Lars Sætran 1 1 Department of Energy and Process Engineering, Norwegian University of Science and Technology 2 Department of Engineering Cybernetics, Norwegian University of Science and Technology Cited by: 2.

on the aerodynamic results on the airfoil with simulated ice shapes. The purpose of the current paper is to provide a summary of the effects of the ice-accretion geometry, size, and location; the airfoil geometry; and ‘ ight Reynolds number on iced-airfoil aerodynamics based on the ” ndings of the recent Illinois aerodynamic efficiency of the same airfoil in moderate rain.

Comparisons with different flow patterns showed the aerodynamic degradation depended on the location of rivulet formation and the diameter of these rivulets. The latter factor was. Stewartson Memorial Lecture: Experiments are Telling You Something.- 1.

Two- and Three-Dimensional Steady Flows.- 1. Predictions of Airfoil Aerodynamic Performance Degradation Due to Icing.- 2.

VISTRAFS: A Simulation Method for Strongly Interacting Viscous Transonic Flow.- 3. This volume contains a selection of the papers presented at the Fourth Symposium on Numerical and Physical Aspects of Aerodynamic Flows, which was held at the California State University, Long Beach, from January It includes the.

Most icing research focuses on the high Reynolds number regime and manned aviation. Information on icing at low Reynolds numbers, as it is encountered by wind turbines and unmanned aerial vehicles, is less available, and few experimental datasets exist that can be used for validation of numerical tools.

This study investigated the aerodynamic performance. accretion and the surface condition of the airfoil had the most impact on the airfoil performance degradation, with rime ice shapes generally having less effect than horn-shaped ice of similar size.

They also noted that the effects on C, - and Cd of ice accretion just on the lower surface was much less than when the accretionCited by: In this paper, the effects of icing on an NACA airfoil have been studied.

Experiments were applied on the clean airfoil, runback ice, horn ice, and spanwise ridge ice at a Reynolds number of × 10 6 over angles of attack from −8° to 20°, and then results are compared. Generally, it is found that ice accretion on the airfoil can contribute to formation of a flow separation bubble Cited by: the NRC PIWT using a thin, high-performance wing section rigged with a single-element slotted flap fixed at 20 deg.

The thin, high-performance airfoil was regarded as typical of wings on regional jet transport airplanes. Aerodynamic measurements were again made, and effects on lift coefficient were significantly larger than in past Size: KB.

number on the multi-element airfoil maximum lift performance degradation, C1 due tO simulated Ice. The data shown indicate that the Reynolds number effect is not large for this case. Previous results, however, show that tests at RN File Size: 6MB. This paper opens up a new perspective on the aerodynamic performance of a wind turbine airfoil.

More specifically, the paper deals with a steady, incompressible two-phase flow, consisting of air and two different concentrations of sand particles, over an airfoil from the National Renewable Energy Laboratory, NREL S The numerical simulations were performed on turbulence Cited by: 2.

EXAMPLE OF USE OF CORRELATION To illustrate how the preceding correlations may be used to assess the mag nitudes of aerodynamic penalties for various airfoils in icing conditions, the following hypothetical icing encounters will be evaluated: Flight and icing conditions Icing encounter A B Airfoil 65A L Chord, in.

96 Angle of. Damp air with high humidity combined with foggy, rainy weather, and icing in winter weather often is found to cause turbine performance degradation, and it is more concerned with offshore wind farm development.

To address and understand the high humidity effects on wind turbine performance, our study has been conducted with spread sheet analysis on damp air properties Cited by: 2.

Predictions if airfoil aerodynamic performance degradation due to icing [microform] / Robert J. Shaw, Ma Ice shapes and the resulting drag increase for a NACA airfoil [microform] / William Olsen, Robert S NASA's aircraft icing analysis [microform] / Robert J.

Shaw. of airfoil performance. Some of related studies are discussed below. According to the investigation done by L. X. Zhang et al., () numerical simulation had become an attractive method to carry out researches on structure design and aerodynamic performance prediction of wind .In chapter 2 of his book Fluid Dynamic Lift, Sighard Hoerner discusses the influence of thickness by going to the extreme of an airfoil with a circular cross section.

Assuming that we would manage by means of boundary layer control around the rear side, to displace the stagnation points from zero (at the forward side) and from ° (at the rear side) both down toward 90° .An experimental investigation of multi-element airfoil ice accretion and resulting performance degradati Predictions if airfoil aerodynamic performance degradation due to icing [microform] / Robert J.

Shaw, Ma Modern airfoil ice accretions [microform] / Harold E. Addy, Jr., Mark G. Potapczuk, and David W. Sheldon.