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Evolving the Oblique Wing
NASA AERONAUTICS BOOK SERIES A I 3 A 1 A 0 2 H D IS R T A O W RY T A Bruce I. Larrimer MANUSCRIP . Bruce I. Larrimer Library of Congress Cataloging-in-Publication Data Larrimer, Bruce I. Thinking obliquely : Robert T. Jones, the Oblique Wing, NASA's AD-1 Demonstrator, and its legacy / Bruce I. Larrimer. pages cm Includes bibliographical references. 1. Oblique wing airplanes--Research--United States--History--20th century. 2. Research aircraft--United States--History--20th century. 3. United States. National Aeronautics and Space Administration-- History--20th century. 4. Jones, Robert T. (Robert Thomas), 1910- 1999. I. Title. TL673.O23L37 2013 629.134'32--dc23 2013004084 Copyright © 2013 by the National Aeronautics and Space Administration. The opinions expressed in this volume are those of the authors and do not necessarily reflect the official positions of the United States Government or of the National Aeronautics and Space Administration. This publication is available as a free download at http://www.nasa.gov/ebooks. Introduction v Chapter 1: American Genius: R.T. Jones’s Path to the Oblique Wing .......... ....1 Chapter 2: Evolving the Oblique Wing ............................................................ 41 Chapter 3: Design and Fabrication of the AD-1 Research Aircraft ................75 Chapter 4: Flight Testing and Evaluation of the AD-1 ................................... 101 Chapter 5: Beyond the AD-1: The F-8 Oblique Wing Research Aircraft ....... 143 Chapter 6: Subsequent Oblique-Wing Plans and Proposals ....................... 183 Appendices Appendix 1: Physical Characteristics of the Ames-Dryden AD-1 OWRA 215 Appendix 2: Detailed Description of the Ames-Dryden AD-1 OWRA 217 Appendix 3: Flight Log Summary for the Ames-Dryden AD-1 OWRA 221 Acknowledgments 230 Selected Bibliography 231 About the Author 247 Index 249 iii This time-lapse photograph shows three of the various sweep positions that the AD-1's unique oblique wing could assume. -
In-Flight Camber Transformation of Aircraft Wing Based on Variation in Thickness-To-Chord Ratio
International Journal of Industrial Electronics and Electrical Engineering, ISSN: 2347-6982 Volume-2, Issue-7, July-2014 IN-FLIGHT CAMBER TRANSFORMATION OF AIRCRAFT WING BASED ON VARIATION IN THICKNESS-TO-CHORD RATIO 1PRITAM KUMAR PRATIHARI, 2NAVUDAY SHARMA, 3JAYRAJINAMDAR 1,2,3Amity Institute of Space Science and Technology, Amity University, Noida, 201303, Uttar Pradesh, India. E-mail: [email protected], [email protected], [email protected] Abstract- In general, there is wide gap between subsonic flight and supersonic flight, mainly due to aerodynamic limitations. This paper presents a method for development of next generation aircraft wings whose camber can be transformed in-flight for enabling it to fly efficiently in different regimes of Mach number; say, Subsonic to supersonic and vice-versa. To demonstrate the aerodynamic performance of the subsonic airfoil (C141A) and a supersonic airfoil (NACA 65206), the flow is simulated by using the commercial program GAMBIT and FLUENT. An important aspect is the mechanical and hydraulic transformation mechanism working inside the wing which helps it to change the camber according to the requirement. For this mechanism, a Hydraulic expansion-contraction system is used which works on the principle of Master and Slave Piston-cylinder arrangement. This concept can be practically very important to increase aerodynamic efficiency of the aircraft in different regions of subsonic, transonic and supersonic flights. Moreover, this idea of real-time camber transformation can make an aircraft multipurpose in accordance to Mach regime of flight. I. INTRODUCTION transform the camber of the subsonic airfoil to supersonic airfoil and vice versa in flight by variation Much research on the development of aircraft wings of thickness to chord ratio of the airfoil. -
Supersonic Thin Airfoil Theory Aa200b Lecture 5 January 20, 2005
Supersonic Thin Airfoil Theory AA200b Lecture 5 January 20, 2005 AA200b - Applied Aerodynamics II 1 AA200b - Applied Aerodynamics II Lecture 5 Foundations of Supersonic Thin Airfoil Theory The equations that govern the steady subsonic and supersonic flow of an inviscid fluid around thin bodies can be shown to be very similar in appearance to Laplace’s equation @2Á @2Á + = 0; (1) @x2 @y2 which we have used in previous lectures for incompressible flow. In fact, the equations for a free stream Mach number different from zero are given by @2Á @2Á (1 ¡ M 2 ) + = 0: (2) 1 @x2 @y2 Notice that although Eqns. 1 and 2 look very similar, a fundamental change in behavior occurs as the free stream Mach Number, M1, increases past 2 AA200b - Applied Aerodynamics II Lecture 5 the value of 1: the PDE goes from elliptic to hyperbolic and it takes on a wavelike behavior. Eqn. 2 governs the behavior of a supersonic flow where only small disturbances have been introduced. You should already be familiar with a number of results for two- dimensional, isentropic, supersonic flow such as the Prandtl-Meyer function (weak reversible turning analysis, both positive and negative). These notes expand on that knowledge an apply it to the computation of forces and moments on supersonic airfoils. The main difference when compared to incompressible thin airfoil theory is the appearance of drag (in an inviscid flow). The source of this drag is the radiation to infinity of pressure waves created by disturbances at the surface of the airfoil. We will call this drag wave drag. -
Probabilistic Aerothermal Design of Compressor Airfoils Victor E. Garzon
Probabilistic Aerothermal Design of Compressor Airfoils by Victor E. Garzon B.S., University of Kentucky (1994) M.S., University of Kentucky (1998) Submitted to the Department of Aeronautics and Astronautics in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY February 2003 c Massachusetts Institute of Technology 2003. All rights reserved. Author Department of Aeronautics and Astronautics 11 December 2002 Certified by David L. Darmofal Associate Professor of Aeronautics and Astronautics Thesis Supervisor Certified by Mark Drela Professor of Aeronautics and Astronautics Certified by Edward M. Greitzer H. N. Professor of Aeronautics and Astronautics Certified by Ian A. Waitz Professor of Aeronautics and Astronautics Accepted by Edward M. Greitzer H. N. Slater Professor of Aeronautics and Astronautics Chair, Committee on Graduate Students Probabilistic Aerothermal Design of Compressor Airfoils by Victor E. Garzon Submitted to the Department of Aeronautics and Astronautics on 11 December 2002, in partial fulfillment of the requirements for the degree of Doctor of Philosophy Abstract Despite the generally accepted notion that geometric variability is undesirable in turbo- machinery airfoils, little is known in detail about its impact on aerothermal compressor performance. In this work, statistical and probabilistic techniques were used to assess the impact of geometric and operating condition uncertainty on axial compressor performance. High-fidelity models of geometric variability were constructed from surface measurements of existing hardware using principal component analysis (PCA). A quasi-two-dimensional cascade analysis code, at the core of a parallel probabilistic analysis framework, was used to assess the impact of uncertainty on aerodynamic performance of compressor rotor airfoils. -
Supersonic Channel Airfoils for Reduced Drag
AIAA JOURNAL Vol. 38, No. 3, March 2000 Supersonic Channel Airfoils for Reduced Drag † ‡ Stephen M. Ruf� n,¤ Anurag Gupta, and David Marshall Georgia Institute of Technology, Atlanta, Georgia 30332-0150 A proof-of-concept study is performed for a supersonic channel-airfoil concept, which can be applied to the leading edges of wings, tails, � ns, struts, and other appendages of aircraft, atmospheric entry vehicles, and missiles in supersonic � ight. It is designed to be bene� cial at conditions in which the leading edge is signi� cantly blunted and the Mach number normal to the leading edge is supersonic. The supersonic channel-airfoil concept is found to result in signi� cantly reduced wave drag and total drag (including skin-friction drag) and signi� cantly increased lift/drag although maximum heat-transfer rate was increased for the geometries tested. Introduction In the present paper a preliminary investigation of a drag-reduc VARIETY of supersonicand hypersonicvehiclesare currently tion concept for supersonicairfoils and wings is conducted.A wide A being studied for commercial and military applications. The range of geometric parameters and supersonic � ight conditions are high-speed civil transport (HSCT) aircraft is designed to cruise at considered so that the aerothermodynamic performance of airfoils approximately M = 2.4 and seeks to overcome economic and en employing the present concept are characterized. vironmental barriers1 that have limited the success of previous su personic commercial concepts. Other supersonic � ight vehicles of Overview of Concept signi� cant interest include single-stage-to-orbit (SSTO) and multi Linearizedsupersonictheoryindicatesthatfor an airfoilof a given stage launch vehicles, tactical and strategic hypersonic and super thickness the shape that gives minimum zero-lift bluntness drag is sonic missiles, hypersonic cruise aircraft, and planetary entry ve the sharp diamond airfoil. -
Section 7, Lecture 3: Effects of Wing Sweep
Section 7, Lecture 3: Effects of Wing Sweep • All modern high-speed aircraft have swept wings: WHY? 1 MAE 5420 - Compressible Fluid Flow • Not in Anderson Supersonic Airfoils (revisited) • Normal Shock wave formed off the front of a blunt leading g=1.1 causes significant drag Detached shock waveg=1.3 Localized normal shock wave Credit: Selkirk College Professional Aviation Program 2 MAE 5420 - Compressible Fluid Flow Supersonic Airfoils (revisited, 2) • To eliminate this leading edge drag caused by detached bow wave Supersonic wings are typically quite sharp atg=1.1 the leading edge • Design feature allows oblique wave to attachg=1.3 to the leading edge eliminating the area of high pressure ahead of the wing. • Double wedge or “diamond” Airfoil section Credit: Selkirk College Professional Aviation Program 3 MAE 5420 - Compressible Fluid Flow Wing Design 101 • Subsonic Wing in Subsonic Flow • Subsonic Wing in Supersonic Flow • Supersonic Wing in Subsonic Flow A conundrum! • Supersonic Wing in Supersonic Flow • Wings that work well sub-sonically generally don’t work well supersonically, and vice-versa à Leading edge Wing-sweep can overcome problem with poor performance of sharp leading edge wing in subsonic flight. 4 MAE 5420 - Compressible Fluid Flow Wing Design 101 (2) • Compromise High-Sweep Delta design generates lift at low speeds • Highly-Swept Delta-Wing design … by increasing the angle-of-attack, works “pretty well” in both flow regimes but also has sufficient sweepback and slenderness to perform very Supersonic Subsonic efficiently at high speeds. • On a traditional aircraft wing a trailing vortex is formed only at the wing tips. -
File:Thinking Obliquely.Pdf
NASA AERONAUTICS BOOK SERIES A I 3 A 1 A 0 2 H D IS R T A O W RY T A Bruce I. Larrimer MANUSCRIP . Bruce I. Larrimer Library of Congress Cataloging-in-Publication Data Larrimer, Bruce I. Thinking obliquely : Robert T. Jones, the Oblique Wing, NASA's AD-1 Demonstrator, and its legacy / Bruce I. Larrimer. pages cm Includes bibliographical references. 1. Oblique wing airplanes--Research--United States--History--20th century. 2. Research aircraft--United States--History--20th century. 3. United States. National Aeronautics and Space Administration-- History--20th century. 4. Jones, Robert T. (Robert Thomas), 1910- 1999. I. Title. TL673.O23L37 2013 629.134'32--dc23 2013004084 Copyright © 2013 by the National Aeronautics and Space Administration. The opinions expressed in this volume are those of the authors and do not necessarily reflect the official positions of the United States Government or of the National Aeronautics and Space Administration. This publication is available as a free download at http://www.nasa.gov/ebooks. Introduction v Chapter 1: American Genius: R.T. Jones’s Path to the Oblique Wing .......... ....1 Chapter 2: Evolving the Oblique Wing ............................................................ 41 Chapter 3: Design and Fabrication of the AD-1 Research Aircraft ................75 Chapter 4: Flight Testing and Evaluation of the AD-1 ................................... 101 Chapter 5: Beyond the AD-1: The F-8 Oblique Wing Research Aircraft ....... 143 Chapter 6: Subsequent Oblique-Wing Plans and Proposals ....................... 183 Appendices Appendix 1: Physical Characteristics of the Ames-Dryden AD-1 OWRA 215 Appendix 2: Detailed Description of the Ames-Dryden AD-1 OWRA 217 Appendix 3: Flight Log Summary for the Ames-Dryden AD-1 OWRA 221 Acknowledgments 230 Selected Bibliography 231 About the Author 247 Index 249 iii This time-lapse photograph shows three of the various sweep positions that the AD-1's unique oblique wing could assume. -
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Preceding page blank 127 ~CTERISTICSOF WING SECTIONS AT TRANSONIC SPEEDS By Joh V. Becker Langley ~eronautical Laboratory INTRODUCTION The transonic regime is presumed to begin with the first appearance of a local region of supersonic flow near the airfoil surface and to end when the flow field has become entirely supersonic. The development of theory for transonic flows has been impeded by the coexistence of sub- sonic and supersonic flow regions and the presence of shock. Shock boundary-layer interaction effects which exert a controlling influence fan the transonic region cannot be treated by rigorous theory. The major past of existing knowledge of wTng-section behavior at transonic speeds is therefore derived from experimental research, and any review of the current status such as the present one must depend largely on experimental results . now CHANGES IN THE: TRA~SOIVICREGIME The progressive changes in flow pattern which occur in the transonic regime are illustrated schematically in figure 1. The diagram at the upper left (M = 0.70) represents a condition slightly beyond the critical Mach number (M at which sonic velocity is attained locally). A small region of supersonic flow exists, usually terminated bg shock. The possibility that local supersonic flows of this type can exist without shock is a matter of considerable speculation. Theoretical studies hsve indicated that shock-free flows in an ideal fluid are possible in certain special cases. (see references 1 to 4, for example. ) From the practical standpoint, however, the important fact is that the presence of shock does not have any seriously adverse effects on airfoil performance unless it precipitates boundasy-layer separation. -
Aerodynamic Investigation of Double Wedge Supersonic Airfoil
Published by : International Journal of Engineering Research & Technology (IJERT) http://www.ijert.org ISSN: 2278-0181 Vol. 8 Issue 06, June-2019 Aerodynamic Investigation of Double Wedge Supersonic Airfoil Sai Pradyumna Reddy Gopavaram Jyothi Sushma Is Currently Pursuing Bachelor Degree Program in Is Currently Pursuing Bachelor Degree Program in Aeronautical Engineering in Institute of Aeronautical Aeronautical Engineering in Institute of Aeronautical Engineering, Hyderabad, India. Engineering, Hyderabad, India. Abstract— This is a aerodynamic design study and flow II. METHODOLOGY dynamics of a Double wedge supersonic airfoil. An aerodynamic design methodology was refined by understanding the design A. Ideology which has been developed in Catia V5 and flow simulation Supersonic airfoils for the most part have a geometry as performed in ANSYS fluent. A complete aerodynamic study was performed with Computational Fluid Dynamic analysis which appeared in the assume that has been observed to be gives the performance characteristics like velocity contours, exceptionally compelling at limiting the negative impacts attached shockwave and detached shockwave and it also of shock waves at the wing surfaces close to the edges. evaluates the aerodynamic plots. The velocity contours of the The meager airfoil shape, looking like a diamond shape, supersonic airfoil are found and the selection of appropriate joined with sharp leading and trailing edges is extremely airfoils from a literature review made are also discussed. compelling at coordinating the progression of shock Finally, the results of the aerodynamic design procedure are waves and lessening their solidarity to decrease their presented and appropriate conclusions are drawn. effect on lift age [3]. So the model is planned in catia and Keywords— Catia, Ansys, Fluent, Airfoils, design and then utilized for investigation. -
Robert Jones
NATIONAL ACADEMY OF SCIENCES ROBERT THOMAS JONES 1910– 1999 A Biographical Memoir by WALTER G. VINCENTI Any opinions expressed in this memoir are those of the author and do not necessarily reflect the views of the National Academy of Sciences. Biographical Memoirs, VOLUME 86 PUBLISHED 2005 BY THE NATIONAL ACADEMIES PRESS WASHINGTON, D.C. ROBERT THOMAS JONES May 28, 1910–August 11, 1999 BY WALTER G. VINCENTI HE PLANFORM OF THE wing of every high-speed transport Tone sees flying overhead embodies R. T. Jones’s idea of sweepback for transonic and supersonic flight. This idea, of which Jones was one of two independent discoverers, was described by the late William Sears, a distinguished aerody- namicist who was a member of the National Academy of Sciences, as “certainly one of the most important discover- ies in the history of aerodynamics.” It and other achieve- ments qualify him as among the premier theoretical aero- dynamicists of the twentieth century. And this by a remarkable man whose only college degree was an honorary doctorate. Robert Thomas Jones––“R.T.” to those of us fortunate enough to be his friend––was born on May 28, 1910, in the farming-country town of Macon, Missouri, and died on Au- gust 11, 1999, at age 89, at his home in Los Altos Hills, California. His immigrant grandfather, Robert N. Jones, af- ter being in the gold rush to California, settled near Ma- con, where he farmed in the summer and mined coal in the winter. His father, Edward S. Jones, educated himself in the law and practiced law in Macon; while running for pub- lic office, he traveled the dirt roads of Macon county in a buggy behind a single horse. -
Birth of Sweepback: Related Research at Luftfahrtforschungsanstalt—Germany
JOURNAL OF AIRCRAFT Vol. 42, No. 4, July–August 2005 History of Key Technologies Birth of Sweepback: Related Research at Luftfahrtforschungsanstalt—Germany Peter G. Hamel∗ Technical University Braunschweig, D-38092 Braunschweig, Germany “Be more attentive to new ideas from the research world.” George S. Schairer, former Vice President Research, Boeing (1989) An extended historical review is given about German World War II scientific and industrial research on the beneficial effects of wing sweep on aircraft design by reducing transonic drag rise. The specific role of the former Luftfahrtforschungsanstalt (LFA), which was located in Braunschweig-Voelkenrode, is emphasized. Reference is given to LFA’s partner research organization Aerodynamische Versuchsanstalt in Goettingen, the scientific birthplace of modern aerodynamics. Wind-tunnel facilities at LFA, which were taken out of existence after World War II, are illustrated. Advanced missile research and aircraft support projects at LFA are illuminated. Further, the postwar technical know-how transfer and its implementation to U.S. and other international aircraft projects is highlighted together with contributions of some former German researchers to the advances of aeronautics. Introduction and Beginnings cists at the Aerodynamische Versuchsanstalt (AVA) in Goettingen, OOKING back over the 110 years that have passed since who established systematic wind-tunnel tests to generate a world- first database for future transonic aircraft configurations with wing L the Otto Lilienthal brothers’ aerodynamic model experiments , 7 12 yielded the world’s first manned glider flights at Berlin-Lichterfelde sweep (Figs. 2a and 2b). (1891), and reflecting the first centenary since the Wright brothers’ Complementary swept-wing model wind-tunnel tests were suc- wind-tunnel model tests resulted in the historic manned powered cessively accomplished at Luftfahrtforschungsanstalt (LFA) in flights at Kitty Hawk (1903), we also recall that there was another im- Braunschweig-Voelkenrode (Fig. -
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Memorial Tributes: Volume 3 ADOLF BUSEMANN 62 Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 3 ADOLF BUSEMANN 63 Adolf Busemann 1901–1986 By Robert T. Jones Adolf Busemann, an eminent scientist and world leader in supersonic aerodynamics who was elected to the National Academy of Engineering in 1970, died in Boulder, Colorado, on November 3, 1986, at the age of eighty-five. At the time of his death, Dr. Busemann was a retired professor of aeronautics and space science at the University of Colorado in Boulder. Busemann belonged to the famous German school of aerodynamicists led by Ludwig Prandtl, a group that included Theodore von Karman, Max M. Munk, and Jakob Ackeret. Busemann was the first, however, to propose the use of swept wings to overcome the problems of transonic and supersonic flight and the first to propose a drag-free system of wings subsequently known as the Busemann Biplane. His ''Schock Polar,'' a construction he described as a "baby hedgehog," has simplified the calculations of aerodynamicists for decades. Adolf Busemann was born in Luebeck, Germany, on April 20, 1901. He attended the Carolo Wilhelmina Technical University in Braunschweig and received his Ph.D. in engineering there in 1924. In 1930 he was accorded the status of professor (Venia Legendi) at Georgia Augusta University in Goettingen. In 1925 the Max-Planck Institute appointed him to the position of aeronautical research scientist. He subsequently Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 3 ADOLF BUSEMANN 64 held several positions in the German scientific community, and during the war years, directed research at the Braunschweig Laboratory.