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Author : Stephen Marc Batill
Publisher :
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (117 download)
Download or read book An Investigation of Unsteady Aerodynamics on an Oscillating Airfoil written by Stephen Marc Batill and published by . This book was released on 1972 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428995161
Total Pages : 42 pages
Book Rating : 4.4/5 (289 download)
Download or read book An Experimental and Computational Investigation of Oscillating Airfoil Unsteady Aerodynamics at Large Mean Incidence written by and published by DIANE Publishing. This book was released on 2003 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720380016
Total Pages : 42 pages
Book Rating : 4.3/5 (8 download)
Download or read book An Experimental and Computational Investigation of Oscillating Airfoil Unsteady Aerodynamics at Large Mean Incidence written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major challenge in the design and development of turbomachine airfoils for gas turbine engines is high cycle fatigue failures due to flutter and aerodynamically induced forced vibrations. In order to predict the aeroelastic response of gas turbine airfoils early in the design phase, accurate unsteady aerodynamic models are required. However, accurate predictions of flutter and forced vibration stress at all operating conditions have remained elusive. The overall objectives of this research program are to develop a transition model suitable for unsteady separated flow and quantify the effects of transition on airfoil steady and unsteady aerodynamics for attached and separated flow using this model. Furthermore, the capability of current state-of-the-art unsteady aerodynamic models to predict the oscillating airfoil response of compressor airfoils over a range of realistic reduced frequencies, Mach numbers, and loading levels will be evaluated through correlation with benchmark data. This comprehensive evaluation will assess the assumptions used in unsteady aerodynamic models. The results of this evaluation can be used to direct improvement of current models and the development of future models. The transition modeling effort will also make strides in improving predictions of steady flow performance of fan and compressor blades at off-design conditions. This report summarizes the progress and results obtained in the first year of this program. These include: installation and verification of the operation of the parallel version of TURBO; the grid generation and initiation of steady flow simulations of the NASA/Pratt&Whitney airfoil at a Mach number of 0.5 and chordal incidence angles of 0 and 10 deg.; and the investigation of the prediction of laminar separation bubbles on a NACA 0012 airfoil.Capece, Vincent R. and Platzer, Max F.Glenn Research CenterUNSTEADY AERODYNAMICS; TURBOMACHINERY; AIRFOILS; AEROELASTICITY; GAS TURBINE ENGINES; INCIDENCE; FORCED VIBRATION
Author : United States. National Aeronautics and Space Administration
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (589 download)
Download or read book An Experimental and Computational Investigation of Oscillating Airfoil Unsteady Aerodynamics at Large Mean Incidence ... Nasa/cr--2003-212199 written by United States. National Aeronautics and Space Administration and published by . This book was released on 2003* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Herbert Franklin Herndon
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (166 download)
Download or read book An Investigation of Unsteady Aerodynamic Interaction Between Dual Oscillating Airfoils written by Herbert Franklin Herndon and published by . This book was released on 1963 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sunetra Sarkar
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783838347592
Total Pages : 204 pages
Book Rating : 4.3/5 (475 download)
Download or read book Unsteady Aerodynamics of a Flapping Airfoil written by Sunetra Sarkar and published by LAP Lambert Academic Publishing. This book was released on 2010-03 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book analyzes the unsteady, viscous flow-field of an oscillating airfoil. This has ramifications on understanding the flapping flight of natural biological systems like fishes and invertebrates. It also helps towards a better aerodynamic design and understanding of flapping types MAVs. The flow-field simulation is performed with a grid-free Lagrangian particle based solver using vorticity particles. An examination of the unsteady aerodynamic load and the qualitative wake structures are done for airfoils undergoing pitch and plunge oscillations. The propulsive behavior is investigated at medium to high frequency ranges for different relevant parameters. These are amplitude of oscillation, mean angle of attack, and rotational axis location. Asymmetric sinusoidal motions are also examined. Dynamic stall is another important aspect of unsteady aerodynamics that airfoils and wings experience during their time dependent movement at large angles of attack. Insects use this phenomenon to increase the aerodynamic loads during their large angle flapping maneuvers. This aspect is also studied in this book.
Author :
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)
Download or read book Numerical Studies of Unsteady Transonic Flow Over an Oscillating Airfoil written by and published by . This book was released on 1984 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722321383
Total Pages : 26 pages
Book Rating : 4.3/5 (213 download)
Download or read book Investigation of Oscillating Cascade Aerodynamics by an Experimental Influence Coefficient Technique written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-05 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental experiments are performed in the NASA Lewis Transonic Oscillating Cascade Facility to investigate the torsion mode unsteady aerodynamics of a biconvex airfoil cascade at realistic values of the reduced frequency for all interblade phase angles at a specified mean flow condition. In particular, an unsteady aerodynamic influence coefficient technique is developed and utilized in which only one airfoil in the cascade is oscillated at a time and the resulting airfoil surface unsteady pressure distribution measured on one dynamically instrumented airfoil. The unsteady aerodynamics of an equivalent cascade with all airfoils oscillating at a specified interblade phase angle are then determined through a vector summation of these data. These influence coefficient determined oscillation cascade data are correlated with data obtained in this cascade with all airfoils oscillating at several interblade phase angle values. The influence coefficients are then utilized to determine the unsteady aerodynamics of the cascade for all interblade phase angles, with these unique data subsequently correlated with predictions from a linearized unsteady cascade model. Buffum, Daniel H. and Fleeter, Sanford Glenn Research Center RTOP 535-03-01...
Author : C. M. Wang
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (227 download)
Download or read book Unsteady Aerodynamics of Airfoil Oscillating in and Out of Dynamic Stall written by C. M. Wang and published by . This book was released on 1985 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A solution procedure is presented for the computation of dynamic stall phenomena encountered by arbitrary shaped airfoils under arbitrary flow conditions. This procedure solves the unsteady, incompressible Navier-Stokes and the unsteady boundary layer equations using an efficient, zonal approach. A number of results for a modified NACA 0012 airfoil experiencing dynamic stall are presented and compared with available numerical data. Qualitative comparisons with flow visualization experiments are also presented. (Author).
Author : Ismail H. Tuncer
Publisher :
ISBN 13 :
Total Pages : 412 pages
Book Rating : 4.:/5 (197 download)
Download or read book Unsteady Aerodynamics of Oscillating and Rapidly Pitched Airfoils written by Ismail H. Tuncer and published by . This book was released on 1988 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720448167
Total Pages : 64 pages
Book Rating : 4.4/5 (481 download)
Download or read book Comparison of Theoretical and Experimental Unsteady Aerodynamics of Linear Oscillating Cascade with Supersonic Leading-Edge Locus written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental influence coefficient technique was used to obtain unsteady aerodynamic influence coefficients and, consequently, unsteady pressures for a cascade of symmetric airfoils oscillating in pitch about mid-chord. Stagger angles of 0 deg and 10 deg were investigated for a cascade with a gap-to-chord ratio of 0.417 operating at an axial Mach number of 1.9, resulting in a supersonic leading-edge locus. Reduced frequencies ranged from 0.056 to 0.2. The influence coefficients obtained determine the unsteady pressures for any interblade phase angle. The unsteady pressures were compared with those predicted by several algorithms for interblade phase angles of 0 deg and 180 deg.Ramsey, John K. and Erwin, DanGlenn Research CenterUNSTEADY AERODYNAMICS; INFLUENCE COEFFICIENT; PRESSURE MEASUREMENT; PRESSURE OSCILLATIONS; WIND TUNNEL TESTS; CASCADE FLOW; MACH NUMBER; SUPERSONIC FLUTTER; AIRFOIL OSCILLATIONS; PRESSURE DISTRIBUTION; SUPERSONIC WIND TUNNELS
Author : Sanford Fleeter
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (227 download)
Download or read book Research on Aeroelastic Phenomena in Airfoil Cascades. An Experimental Investigation of the Unsteady Aerodynamics of a Controlled Oscillating MCA Airfoil Cascade written by Sanford Fleeter and published by . This book was released on 1976 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique unsteady cascade experiment directed at providing fundamental aerodynamic data needed to verify or direct refinements to the basic model on unstalled supersonic torsional flutter in turbomachines is presented. In particular, the steady, quasi-static, and unsteady aerodynamics were determined for a multiple circular arc (MCA) airfoil cascade which modeled the tip section of an advanced design fan blade. The MCA cascade was harmonically oscillated in the torsional mode at a reduced frequency value of 0.14. The fundamental unsteady aerodynamic data was obtained at a Mach number equal to 1.55 over a range of interblade phase angles for two values of the cascade static pressure ratio. These unsteady results were then correlated with the predictions from state-of-the-art unsteady flat plate cascade analyses.
Author : James C. Wu
Publisher : Springer
ISBN 13 : 3662440407
Total Pages : 147 pages
Book Rating : 4.6/5 (624 download)
Download or read book Elements of Vorticity Aerodynamics written by James C. Wu and published by Springer. This book was released on 2017-12-27 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book opens with a discussion of the vorticity-dynamic formulation of the low Mach number viscous flow problem. It examines the physical aspects of the velocity and the vorticity fields, their instantaneous relationship, and the transport of vorticity in viscous fluids for steady and unsteady flows. Subsequently, using classical analyses it explores the mathematical aspects of vorticity dynamics and issues of initial and boundary conditions for the viscous flow problem. It also includes the evolution of the vorticity field which surrounds and trails behind airfoils and wings, generalizations of Helmholtz’ vortex theorems and the Biot-Savart Law. The book introduces a theorem that relates the aerodynamic force to the vorticity moment and reviews the applications of the theorem. Further, it presents interpretations of the Kutta-Joukowski theorem and Prandtl’s lifting line theory for vorticity dynamics and discusses wake integral methods. The virtual-mass effect is shown to be the seminal event in unsteady aerodynamics and a simple approach for evaluating virtual-mass forces on the basis of vorticity dynamics is presented. The book presents a modern viewpoint on vorticity dynamics as the framework for understanding and establishing the fundamental principles of viscous and unsteady aerodynamics. It is intended for graduate-level students of classical aerodynamics and researchers exploring the frontiers of fully unsteady and non-streamlined aerodynamics.
Author : Chwan-huei Wang
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (187 download)
Download or read book Unsteady Aerodynamics and Flutter Analysis for Oscillating Airfoils in Upper Transonic Flow written by Chwan-huei Wang and published by . This book was released on 1987 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xavier Bertrán
Publisher :
ISBN 13 : 9783832204532
Total Pages : 133 pages
Book Rating : 4.2/5 (45 download)
Download or read book Separation Effects on the Unsteady Aerodynamics of Oscillating Airfoils at Low Speeds written by Xavier Bertrán and published by . This book was released on 2002 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ülgen Gülçat
Publisher : Springer Nature
ISBN 13 : 3030607771
Total Pages : 445 pages
Book Rating : 4.0/5 (36 download)
Download or read book Fundamentals of Modern Unsteady Aerodynamics written by Ülgen Gülçat and published by Springer Nature. This book was released on 2021-01-04 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the concept of unsteady aerodynamics and its underlying principles. The author provides the readers with a comprehensive review of the fundamental physics of free and forced unsteadiness, the terminology and basic equations of aerodynamics ranging from incompressible flow to hypersonics. The book also covers modern topics related to the developments made in recent years, especially in relation to wing flapping for propulsion. The book is written for graduate and senior year undergraduate students in aerodynamics and also serves as a reference for experienced researchers. Each chapter includes ample examples, questions, problems and relevant references. This 3rd edition includes a new chapter about unsteady applications related to the thrust optimization, aerodynamic stability and trim because there has been much progress in unsteady applications of the flapping wing technology. In addition, further material is presented in Appendix for evaluating the stability derivatives so that no derivation of equations is left incomplete but not overdone in the text.
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (317 download)
Download or read book Experimental Studies of Scale Effects on Oscillating Airfoils at Transonic Speeds written by and published by . This book was released on 1980 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
