Download or read book Effect of Roughness on Properties of Airfoils written by O. Schrenk and published by . This book was released on 1926 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Effect of Roughness on Airfoils written by O. Schrenk and published by . This book was released on 1927 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calculation of Combining Effects in the Structure of Airplane Wings written by K. Thalau and published by . This book was released on 1926 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lecture concerns the combining effects in airplane wings so as to save some of the dead weight.
Download or read book The Effects of Roughness at High Reynolds Numbers on the Lift and Drag Characteristics of Three Thick Airfoils written by Frank T. Abbott and published by . This book was released on 1944 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Aerodynamic Characteristics of Airfoils as Affected by Surface Roughness written by Ray W. Hooker and published by . This book was released on 1933 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Technical Memorandums written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1926 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chiefly translations from foreign aeronautical journals.
Download or read book The Effect of Roughness Applied on an Airfoil at Or Near the Leading Edge at Low Reynolds Numbers written by Diane Ruth Bloch and published by . This book was released on 1986 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Specific Types of Surface Roughness on Boundary layer Transition written by Laurence K. Loftin and published by . This book was released on 1946 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Index of NACA Technical Publications written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1949 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Roughness on Advanced Airfoils and Wings written by Faith Tezok and published by . This book was released on 1995 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmentally Induced Surface Roughness Effects on Laminar Flow Airfoils written by M.B. Bragg and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Roughness on Advanced Airfoils written by Bombardier Aerospace and published by . This book was released on 1998 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents results of the second and third phases of a research program that studied the effects of roughness contamination on modern airfoils and wings. Phase two involved testing a Bombardier Aerospace proprietary supercritical airfoil section in a wind tunnel, and phase three involved a low-speed test of the Canadair Regional Jet wing in a larger wind tunnel. The performance of the tested models with different flap deflections, sweep angles, and roughness parameters was compared to computational fluid dynamics (CFD) results. A quasi-three-dimensional CFD model based on a viscous-inviscid coupling technique, using a panel method for the inviscid flow field and a two-dimensional compressible boundary layer with sweep and roughness effects, was calibrated using the results. Experimental results were also compared with Regional Jet flight test data. The results reveal the possibility of predicting the effects of roughness on aerodynamic performance.
Download or read book A Selected Listing of NASA Scientific and Technical Reports for written by and published by . This book was released on 1949 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Roughness on Airfoils written by Oskar Schrenk and published by . This book was released on 1927 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We will here report on the effects of coarsely roughening not only the pressure side but also the suction or upper side of airfoils, as the first group of a larger series of experiments.
Download or read book The Effects of Roughness on an Airfoil at Low Reynolds Numbers written by Arthur F. Huber and published by . This book was released on 1985 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Airfoil Thickness and Maximum Lift Coefficient on Roughness Sensitivity written by and published by . This book was released on 2005 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: A matrix of airfoils has been developed to determine the effects of airfoil thickness and the maximum lift to leading-edge roughness. The matrix consists of three natural-laminar-flow airfoils, the S901, S902, and S903, for wind turbine applications. The airfoils have been designed and analyzed theoretically and verified experimentally in the Pennsylvania State University low-speed, low-turbulence wind tunnel. The effect of roughness on the maximum life increases with increasing airfoil thickness and decreases slightly with increasing maximum lift. Comparisons of the theoretical and experimental results generally show good agreement.
Download or read book Effects of Roughness on Advances Airfoils and Wings written by and published by . This book was released on 1995 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
