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An Approach To The Constrained Design Of Natural Laminar Flow Airfoils
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722177904 Total Pages :78 pages Book Rating :4.1/5 (779 download)
Book Synopsis An Approach to the Constrained Design of Natural Laminar Flow Airfoils by : National Aeronautics and Space Administration (NASA)
Download or read book An Approach to the Constrained Design of Natural Laminar Flow Airfoils written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: A design method has been developed by which an airfoil with a substantial amount of natural laminar flow can be designed, while maintaining other aerodynamic and geometric constraints. After obtaining the initial airfoil's pressure distribution at the design lift coefficient using an Euler solver coupled with an integral turbulent boundary layer method, the calculations from a laminar boundary layer solver are used by a stability analysis code to obtain estimates of the transition location (using N-Factors) for the starting airfoil. A new design method then calculates a target pressure distribution that will increase the laminar flow toward the desired amount. An airfoil design method is then iteratively used to design an airfoil that possesses that target pressure distribution. The new airfoil's boundary layer stability characteristics are determined, and this iterative process continues until an airfoil is designed that meets the laminar flow requirement and as many of the other constraints as possible. Green, Bradford E. Langley Research Center...
Book Synopsis An Approach to the Constrained Design of Natural Laminar Flow Airfoils by : Bradford E. Green
Download or read book An Approach to the Constrained Design of Natural Laminar Flow Airfoils written by Bradford E. Green and published by . This book was released on 1995 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Approach to the Constrained Design of Natural Laminar Flow Airfoils by :
Download or read book An Approach to the Constrained Design of Natural Laminar Flow Airfoils written by and published by . This book was released on 1997 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Approach to Constrained Aerodynamic Design with Application to Airfoils by : Richard Lawson Campbell
Download or read book An Approach to Constrained Aerodynamic Design with Application to Airfoils written by Richard Lawson Campbell and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancements to the Inverse Design of Low-Speed Natural-Laminar-Flow Airfoils by :
Download or read book Enhancements to the Inverse Design of Low-Speed Natural-Laminar-Flow Airfoils written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of inverse airfoil design has traditionally been the determination of the airfoil shape that results in desired aerodynamic characteristics. Under this general classification, inverse methods have progressed a great deal over the past few decades. With modern inverse methods, it is possible to prescribe velocity and/or boundary-layer characteristics along with desired geometric constraints in the design of airfoils. In spite of these advances, inverse airfoil design still involves a certain amount of trial and error when a designer attempts to fine tune the drag polar of the airfoil or when attempting to tailor the airfoil for a particular application. The research presented in this thesis makes two specific advances to the state of the art in inverse design. The first part of the research describes the development of an approach by which a desired boundary-layer transition curve can be specified as an input to inverse design. The second part presents an approach for incorporating aircraft performance considerations in the inverse design process. The two advances can help reduce the design cycle time for airfoil and aircraft design by reducing the amount of trial and error in the design process. The motivation factor for the first part of the research (inverse design via specification of the boundary-layer transition curve) was the strong connection between the transition curve and the airfoil drag polar. In the approach developed, a multidimensional Newton iteration is used to adjust the velocity distribution until the transition lift coefficient at several locations on the airfoil are within a given tolerance of the specifications. It is shown that the shape of the drag bucket as well as the camber and extents of laminar flow on the airfoil can be controlled through the specification of the transition-curve. This method represents an enhancement over previous inverse airfoil design methods since it allows for a single specification that spans multipl.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722063139 Total Pages :26 pages Book Rating :4.0/5 (631 download)
Book Synopsis An Approach to Constrained Aerodynamic Design with Application to Airfoils by : National Aeronautics and Space Administration (NASA)
Download or read book An Approach to Constrained Aerodynamic Design with Application to Airfoils written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: An approach was developed for incorporating flow and geometric constraints into the Direct Iterative Surface Curvature (DISC) design method. In this approach, an initial target pressure distribution is developed using a set of control points. The chordwise locations and pressure levels of these points are initially estimated either from empirical relationships and observed characteristics of pressure distributions for a given class of airfoils or by fitting the points to an existing pressure distribution. These values are then automatically adjusted during the design process to satisfy the flow and geometric constraints. The flow constraints currently available are lift, wave drag, pitching moment, pressure gradient, and local pressure levels. The geometric constraint options include maximum thickness, local thickness, leading-edge radius, and a 'glove' constraint involving inner and outer bounding surfaces. This design method was also extended to include the successive constraint release (SCR) approach to constrained minimization. Campbell, Richard L. Langley Research Center RTOP 505-59-10-03...
Book Synopsis Natural Laminar Flow Airfoil Analysis and Trade Studies by :
Download or read book Natural Laminar Flow Airfoil Analysis and Trade Studies written by and published by . This book was released on 1979 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Experimental Results for a Flapped Natural-laminar-flow Airfoil for General Aviation Applications by : Dan M. Somers
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.
Book Synopsis Design and Experimental Results for a Natural-laminar-flow Airfoil for General Aviation Applications by : Dan M. Somers
Download or read book Design and Experimental Results for a 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 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Experimental Results for a Natural-Laminar-Flow Airfoil for General Aviation Application by : Dan M. Somers
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.
Book Synopsis Enhancements to the Inverse Design of Low-speed Natural-laminar-flow Airfoils by : Jeffrey Keith Jepson
Download or read book Enhancements to the Inverse Design of Low-speed Natural-laminar-flow Airfoils written by Jeffrey Keith Jepson and published by . This book was released on 2003 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: inverse airfoil design, natural laminar flow airfoils.
Book Synopsis Natural Laminar Flow Airfoil Design Considerations for Winglets on Low-speed Airplanes by : Cornelis P. Van Dam
Download or read book Natural Laminar Flow Airfoil Design Considerations for Winglets on Low-speed Airplanes written by Cornelis P. Van Dam and published by . This book was released on 1984 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design of a Slotted, Natural-laminar-flow Airfoil for a Transport Aircraft by : Dan M. Somers
Download or read book Design of a Slotted, Natural-laminar-flow Airfoil for a Transport Aircraft written by Dan M. Somers and published by . This book was released on 2019 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Natural Laminar Flow Airfoil Design Considerations for Winglets on Low-speed Airplanes by : C. P. Vandam
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.
Book Synopsis Design of a slotted, natural-laminar-flow airfoil for business-jet applications by : Dan M. Somers
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:
Book Synopsis A Design and Analysis Approach for Drag Reduction on Aircraft with Adaptive Lifting Surfaces by :
Download or read book A Design and Analysis Approach for Drag Reduction on Aircraft with Adaptive Lifting Surfaces written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive lifting surfaces, which can be tailored for different flight conditions, have been shown to be beneficial for drag reduction when compared with conventional non-adaptive surfaces. Applying multiple trailing-edge flaps along the wing span allows for the redistribution of lift to suit different flight conditions. The current approach uses the trailing-edge flap distribution to reduce both induced- and profile- components of drag with a trim constraint. Induced drag is reduced by optimally redistributing the lift between the lifting surfaces and along the span of each surface. Profile drag is reduced through the use of natural laminar flow airfoils, which maintain distinct low-drag-ranges (drag buckets) surrounding design lift values. The low-drag-ranges can be extended to include off-design values through small flap deflections, similar to cruise flaps. Trim is constrained for a given static margin by considering longitudinal pitching moment contributions from changes in airfoil section due to individual flap deflections, and from the redistribution of fore-and-aft lift due to combination of flap deflections. The approach uses the concept of basic and additional lift to linearlize the problem, which allows for standard constrained-minimization theory to be employed for determining optimal flap-angle solutions. The resulting expressions for optimal flap-angle solutions are presented as simple matrix equations. This work presents a design and analysis approach which is used to produce flap-angle solutions that independently reduce induced, profile, and total drag. Total drag is defined to be the sum of the induced- and profile-components of drag. The general drag reduction approach is adapted for each specific situation to develop specific drag reduction schemes that are applied to single- and multiple-surface configurations. Successful results show that, for the application of the induced drag reduction schemes on a tailless aircraft, near-elliptical lift dist.
Book Synopsis A Summary of Transonic Natural Laminar Flow Airfoil Development at NAE by : M. Khalid
Download or read book A Summary of Transonic Natural Laminar Flow Airfoil Development at NAE written by M. Khalid and published by . This book was released on 1990 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
