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| Author | : Wyatt Spellman |
| Publisher | : |
| Total Pages | : 152 |
| Release | : 2015 |
| Genre | : Aerodynamics |
| ISBN | : |
| Author | : George Alvin Pierce |
| Publisher | : |
| Total Pages | : |
| Release | : 1973 |
| Genre | : Rotors (Helicopters) |
| ISBN | : |
| Author | : W. J. McCroskey |
| Publisher | : |
| Total Pages | : 38 |
| Release | : 1981 |
| Genre | : |
| ISBN | : |
Stall and its consequences are fundamentally important to the design and operation of flight vehicles. A certain degree of unsteadiness always accompanies the flow over an airfoil or other streamlined body at high angle of attack, but the stall of a lifting surface undergoing unsteady motion is even more complex than static stall. Dynamic stall remains a major unsolved problem with a variety of current applications in aeronautics, hydrodynamics, and wind engineering. This report summarizes the main physical features of the phenomenon and the attempts that have been made to predict it. The information presented is drawn mainly from recent review articles and investigations by the author and his colleagues. Since a large fraction of the existing knowledge has come from experimental research, the details of dynamic stall are discussed principally in physical terms.
| Author | : Ignacio Andreu Angulo |
| Publisher | : |
| Total Pages | : |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
| Author | : Richard B. Noll |
| Publisher | : |
| Total Pages | : 300 |
| Release | : 1983 |
| Genre | : Wind power |
| ISBN | : |
| Author | : Franklin O. Carta |
| Publisher | : |
| Total Pages | : 21 |
| Release | : 1986 |
| Genre | : |
| ISBN | : |
An experiment was conducted to study the aerodynamic response of a wing to large amplitude pitching motions, including dynamic stall. A two-dimensional model was tested at Mach numbers of 0.2, 0.3, and 0.4, corresponding to Reynolds numbers between 2 x 1000000 and 4 x 1000000. A total of 49 unsteady conditions were studied, including both sinusoidal oscillations and constant pitch rate ramps. The ramp motions ranged up to 0 to 30 deg at pitch rates between 17.5 and 350 deg/sec. A preliminary analysis of the results shows significant effects of pitch rate and Mach number on the surface pressures, integrated airloads, and locations of boundary layer transition and separation. A pressure oscillation was detected in the post stall region that appears to result from periodic vortex shedding that has synchronized to the imposed pitching motion. A more detailed analysis of these results will be conducted during the remainder of this activity. Keywords: Unsteady aerodynamics; Dynamic stall; Aerodynamic testing; Unsteady measurement techniques.
| Author | : |
| Publisher | : |
| Total Pages | : 456 |
| Release | : 1995 |
| Genre | : Aeronautics |
| ISBN | : |
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
| Author | : Philippe Désy |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 1986 |
| Genre | : Oscillations |
| ISBN | : |
| Author | : Ülgen Gülçat |
| Publisher | : Springer |
| Total Pages | : 402 |
| Release | : 2015-10-31 |
| Genre | : Technology & Engineering |
| ISBN | : 9811000182 |
In this book, the author introduces the concept of unsteady aerodynamics and its underlying principles. He 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. The treatment of these modern topics has been completely revised end expanded for the new edition. It now includes new numerical examples, a section on the ground effect, and state-space representation.
| Author | : D. C. Daley |
| Publisher | : |
| Total Pages | : 82 |
| Release | : 1983 |
| Genre | : |
| ISBN | : |
This thesis discusses an experimental investigation of dynamic stall for an NACA 0015 airfoil rotated at different constant angular rates. It describes a microcomputer-based automatic data acquisition system capable of acquiring 1000 items of data per second. When this information was used to predict stall and compared with film-data stall indications of the same test runs, there was excellent correlation between them. Results of the investigation showed a consistent correlation between the stall angle at dynamic conditions and the nondimensionalized angular rate. Experimental data was obtained for non-dimensional angular rates (defined as one half the chord times the angular rate divided by free stream velocity) in the range of .005 to .06. (Author).
