Effect of Roughness on Properties of Airfoils PDF Download
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Author: O. Schrenk
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 18
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Book Description
The first group of a large series of contemplated experiments on the effect of roughness was intended to show the effect of great roughness on airfoils of various sizes and attitudes.
Author: O. Schrenk
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 18
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Book Description
The first group of a large series of contemplated experiments on the effect of roughness was intended to show the effect of great roughness on airfoils of various sizes and attitudes.
Author: O. Schrenk
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 12
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Book Description
Author: K. Thalau
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 674
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Book Description
This lecture concerns the combining effects in airplane wings so as to save some of the dead weight.
Author: Frank T. Abbott
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 38
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Book Description
In connection with studies of airfoils applicable to large high-speed aircraft, the effects of roughness on three 22-percent-thick airfoils were investigated. The tests were made over a range of Reynolds numbers from about 6,000,000 to 26,000,000 for the airfoils smooth and with roughness strips applied to the surfaces. The results indicated that for the roughened models the scale effect was generally favorable.
Author: Ray W. Hooker
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 10
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Book Description
The effect on airfoil characteristics of surface roughness of varying degrees and types at different locations on an airfoil was investigated (at high values of the Reynolds number in the N.A.C.A. variable-density wind tunnel).
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 508
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Book Description
Chiefly translations from foreign aeronautical journals.
Author: Diane Ruth Bloch
Publisher:
ISBN:
Category :
Languages : en
Pages : 546
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Book Description
Author: Laurence K. Loftin
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 48
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Book Description
Summary: Tests were conducted with two typical low-drag airfoils of 90-inch chord to determine the effects of surface projections, grooves, and sanding scratches on boundary-layer transition. The Reynolds number at which a spanwise row of cylindrical projections would cause premature transition was determined for a range of Reynolds number from approximately 3 x 106 to 10 x 106. Data were obtained for projections of various sizes and chordwise locations on both low-drag airfoils. The results were analyzed on the assumption that the critical airfoil Reynolds number for a given projection was a function only of the local-flow conditions around the projection. This assumption neglected possible effects of tunnel turbulence, pressure gradient, boundary-layer Reynolds number, and the original extent of the laminar flow. The data correlated on the basis of this assumption within a range of critical airfoil Reynolds number of ±0.5 x 106 and within a range of projection height of ±0.002 inch. The tests of surface grooves and sanding scratches indicated that, for the range of Reynolds number investigated, the laminar boundary layer was much less sensitive to surface grooves and sanding scratches than to projections above the surface.
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 616
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Book Description
Author: Faith Tezok
Publisher:
ISBN:
Category :
Languages : en
Pages : 216
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Book Description
