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Author : Dan M. Somers
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (816 download)
Download or read book Design of a slotted, natural-laminar-flow airfoil for business-jet applications written by Dan M. Somers and published by . This book was released on 2012 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dan M. Somers
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (31 download)
Download or read book Design and Experimental Results for a Natural-Laminar-Flow Airfoil for General Aviation Application written by Dan M. Somers and published by . This book was released on 1981 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A natural-laminar-flow airfoil for general aviation applications, the NLF(1)-0416, was designed and analyzed theoretically and verified experimentally in the Langley Low-Turbulence Pressure Tunnel. The basic objective of combining the high maximum lift of the NASA low-speed airfoils with the low cruise drag of the NACA 6-series airfoils was achieved. The safety requirement that the maximum lift coefficient not be significantly affected with transition fixed near the leading edge was also met. Comparisons of the theoretical and experimental results show excellent agreement. Comparisons with other airfoils, both laminar flow and turbulent flow, confirm the achievement of the basic objective.
Author : Leonard P. Metkowski
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (142 download)
Download or read book Aerodynamic Design and Analysis for a Strut-Braced Transport Aircraft Utilizing Slotted, Natural-Laminar-Flow Airfoils written by Leonard P. Metkowski and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis performs a design study exploring the aerodynamic design of a strut-braced transport aircraft. Moving from classical lifting-line theory to modern Reynolds Averaged Navier Stokes methods, several design and analysis methods are used to better understand this configuration, which is designed to meet NASA's N+4 commuter transport goals. The use of a novel slotted airfoil, the S207, is incorporated from the start. Intended to achieve long runs of laminar flow, this airfoil was designed along with the strut-braced configuration presented in this work. Analysis of both the airfoil's sectional characteristics and its application to the planform are explored. Several other areas researched include the use of a lifting strut verses an aerodynamically feathered strut and the design of winglets on the high-span aircraft. The aerodynamically feathered strut is chosen for the configuration at hand, while winglets are predicted by classical methods to add approximately 3% to maximum efficiency. The configuration is further analyzed with the modern computational fluid dynamic solver, OVERFLOW. This Reynolds Averaged Navier-Stokes solver is coupled with the Amplification-Factor-Transport transition model for transonic laminar flow prediction. Several performance differences with both the two-dimensional airfoil, and three-dimensional configuration are quantified. For two-dimensional cruise cases, Euler methods predict approximately 15 counts less profile drag when compared to the Reynolds Averaged method. Increases in profile drag that are found in the Reynolds Averaged models are attributed to early transition on the airfoil fore-element. The Euler methods also show transition to move slowly forward on the upper surface at increasing angles of attack. In comparison, the RANS method has transition move rather rapidly forward, limiting the upper corner of the low-drag region. Three-dimensional comparisons include highlighting problem areas around the strut/wing juncture, along with differences in spanwise lift distributions due to the addition of winglets. Further discussion on the sectional pressure distributions and the resulting two-dimensionality of the flow on the slotted configuration due to the winglet is also presented. Overall efficiency gains predicted by RANS with the addition of the winglet is found to be approximately 5%.
Author : Dan M. Somers
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (31 download)
Download or read book Design and Experimental Results for a Flapped Natural-laminar-flow Airfoil for General Aviation Applications written by Dan M. Somers and published by . This book was released on 1981 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: A flapped natural laminar flow airfoil for general aviation applications, the NLF(1)-0215F, has been designed and analyzed theoretically and verified experimentally in the Langley Low Turbulence Pressure Tunnel. The basic objective of combining the high maximum lift of the NASA low speed airfoils with the low cruise drag of the NACA 6 series airfoils has been achieved. The safety requirement that the maximum lift coefficient not be significantly affected with transition fixed near the leading edge has also been met. Comparisons of the theoretical and experimental results show generally good agreement.
Author : R.W. Barnwell
Publisher : Springer Science & Business Media
ISBN 13 : 1461228727
Total Pages : 415 pages
Book Rating : 4.4/5 (612 download)
Download or read book Natural Laminar Flow and Laminar Flow Control written by R.W. Barnwell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on laminar flow and its transition to turbulent flow has been an important part of fluid dynamics research during the last sixty years. Since transition impacts, in some way, every aspect of aircraft performance, this emphasis is not only understandable but should continue well into the future. The delay of transition through the use of a favorable pressure gradient by proper body shaping (natural laminar flow) or the use of a small amount of suction (laminar flow control) was recognized even in the early 1930s and rapidly became the foundation of much of the laminar flow research in the U.S. and abroad. As one would expect, there have been many approaches, both theoretical and experimental, employed to achieve the substantial progress made to date. Boundary layer stability theories have been formu lated and calibrated by a good deal of wind tunnel and flight experiments. New laminar now airfoils and wings have been designed and many have been employed in aircraft designs. While the early research was, of necessity, concerned with the design of subsonic aircraft interest has steadily moved to higher speeds including those appropriate to planetary entry. Clearly, there have been substantial advances in our understanding of transition physics and in the development and application of transition prediction methodolo gies to the design of aircraft.
Author : C. P. Vandam
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (317 download)
Download or read book Natural Laminar Flow Airfoil Design Considerations for Winglets on Low-speed Airplanes written by C. P. Vandam and published by . This book was released on 1984 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Winglet airfoil section characteristics which significantly influence cruise performance and handling qualities of an airplane are discussed. A good winglet design requires an airfoil section with a low cruise drag coefficient, a high maximum lift coefficient, and a gradual and steady movement of the boundary layer transition location with angle of attack. The first design requirement provides a low crossover lift coefficient of airplane drag polars with winglets off and on. The other requirements prevent nonlinear changes in airplane lateral/directional stability and control characteristics. These requirements are considered in the design of a natural laminar flow airfoil section for winglet applications and chord Reynolds number of 1 to 4 million.
Author :
Publisher :
ISBN 13 :
Total Pages : 340 pages
Book Rating : 4.:/5 (317 download)
Download or read book Laminar Flow Aircraft Certification written by and published by . This book was released on 1986 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722410209
Total Pages : 54 pages
Book Rating : 4.4/5 (12 download)
Download or read book Full-Scale Semispan Tests of a Business-Jet Wing with a Natural Laminar Flow Airfoil written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-07 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: A full-scale semispan model was investigated to evaluate and document the low-speed, high-lift characteristics of a business-jet class wing that utilized the HSNLF(1)-0213 airfoil section and a single-slotted flap system. Also, boundary-layer transition effects were examined, a segmented leading-edge droop for improved stall/spin resistance was studied, and two roll-controlled devices were evaluated. The wind-tunnel investigation showed that deployment of single-slotted, trailing-edge flap was effective in providing substantial increments in lift required for takeoff and landing performance. Fixed-transition studies to investigate premature tripping of the boundary layer indicated no adverse effects in lift and pitching-moment characteristics for either the cruise or landing configuration. The full-scale results also suggested the need to further optimize the leading-edge droop design that was developed in the subscale tests. Hahne, David E. and Jordan, Frank L., Jr. Langley Research Center...
Author : David Edgar Hahne
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (31 download)
Download or read book Full-scale Semispan Tests of a Business-jet Wing with a Natural Laminar Flow Airfoil written by David Edgar Hahne and published by . This book was released on 1991 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard Eppler
Publisher : Springer Science & Business Media
ISBN 13 : 3662026465
Total Pages : 569 pages
Book Rating : 4.6/5 (62 download)
Download or read book Airfoil Design and Data written by Richard Eppler and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: This detailed book describes a procedure for the design and analysis of subsonic airfoils. Contains 116 new airfoils for a wide range of Reynolds numbers and application requirements, including the input data for the computer code.
Author :
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (317 download)
Download or read book Wind Tunnel Results for a High-speed, Natural Laminar-flow Airfoil Designed for General Aviation Aircraft written by and published by . This book was released on 1985 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. A. Rozendaal
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (317 download)
Download or read book Natural Laminar Flow Flight Experiments on a Swept Wing Business Jet written by R. A. Rozendaal and published by . This book was released on 1986 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Aeronautics and Space Administration
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (91 download)
Download or read book NASA Technical Paper written by United States. National Aeronautics and Space Administration and published by . This book was released on 1991 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by and published by . This book was released on 1991 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 832 pages
Book Rating : 4.F/5 ( download)
Download or read book Aerospace America written by and published by . This book was released on 1988 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. S. Dodbele
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (317 download)
Download or read book Design of Fuselage Shapes for Natural Laminar Flow written by S. S. Dodbele and published by . This book was released on 1986 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
