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Author : Michael Scully
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (995 download)
Download or read book Second Interim Report on the Computation of Helicopter Rotor Wake Geometry written by Michael Scully and published by . This book was released on 1968 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. P. Scully
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (227 download)
Download or read book On the Computation of Helicopter Rotor Wake Geometry written by M. P. Scully and published by . This book was released on 1968 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new technique is described whereby the rotor tip vortex geometry may be calculated.
Author : Michael P. Scully
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (641 download)
Download or read book Computation of Helicopter Rotor Wake Geometry and Its Influence on Rotor Harmonic Airloads written by Michael P. Scully and published by . This book was released on 1975* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael Scully
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (995 download)
Download or read book Interim Report on the Computation of Helicopter Rotor Wake Geometry written by Michael Scully and published by . This book was released on 1968 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Terence A. Ghee
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (317 download)
Download or read book Wake Geometry Measurements and Analytical Calculations on a Small-Scale Rotor Model written by Terence A. Ghee and published by . This book was released on 1996 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781730900822
Total Pages : 70 pages
Book Rating : 4.9/5 (8 download)
Download or read book Wake Geometry Measurements and Analytical Calculations on a Small-Scale Rotor Model written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-05 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted in the Langley 14- by 22-Foot Subsonic Tunnel to quantify the rotor wake behind a scale model helicopter rotor in forward level flight at one thrust level. The rotor system in this test consisted of a four-bladed fully articulated hub with blades of rectangular planform and an NACA 0012 airfoil section. A laser light sheet, seeded with propylene glycol smoke, was used to visualize the vortex geometry in the flow in planes parallel and perpendicular to the free-stream flow. Quantitative measurements of wake geometric proper- ties, such as vortex location, vertical skew angle, and vortex particle void radius, were obtained as well as convective velocities for blade tip vortices. Comparisons were made between experimental data and four computational method predictions of experimental tip vortex locations, vortex vertical skew angles, and wake geometries. The results of these comparisons highlight difficulties of accurate wake geometry predictions. Ghee, Terence A. and Berry, John D. and Zori, Laith A. J. and Elliott, Joe W. Unspecified Center...
Author : T. A. Egolf
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (317 download)
Download or read book Helicopter Rotor Wake Geometry and Its Influence in Forward Flight. Volume 1: Generalized Wake Geometry and Wake Effect on Rotor Airloads and Performance written by T. A. Egolf and published by . This book was released on 1983 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytic investigation to generalize wake geometry of a helicopter rotor in steady level forward flight and to demonstrate the influence of wake deformation in the prediction of rotor airloads and performance is described. Volume 1 presents a first level generalized wake model based on theoretically predicted tip vortex geometries for a selected representative blade design. The tip vortex distortions are generalized in equation form as displacements from the classical undistorted tip vortex geometry in terms of vortex age, blade azimuth, rotor advance ratio, thrust coefficient, and number of blades. These equations were programmed to provide distorted wake coordinates at very low cost for use in rotor airflow and airloads prediction analyses. The sensitivity of predicted rotor airloads, performance, and blade bending moments to the modeling of the tip vortex distortion are demonstrated for low to moderately high advance ratios for a representative rotor and the H-34 rotor. Comparisons with H-34 rotor test data demonstrate the effects of the classical, predicted distorted, and the newly developed generalized wake models on airloads and blade bending moments. Use of distorted wake models results in the occurrence of numerous blade-vortex interactions on the forward and lateral sides of the rotor disk. The significance of these interactions is related to the number and degree of proximity to the blades of the tip vortices. The correlation obtained with the distorted wake models (generalized and predicted) is encouraging.
Author : M. P. Scully
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (227 download)
Download or read book Helicopter Rotor Wake Geometry and Airloads and Helicopter Rotor Wakes written by M. P. Scully and published by . This book was released on 1972 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer programs have been developed for the calculation of helicopter rotor tip vortex geometry in hover and forward flight and for the calculation of helicopter rotor harmonic airloads in forward flight. Calculated forward flight tip vortex geometries compare well in general with experimental smoke studies although there are differences in detail. The hovering tip vortex geometry agrees qualitatively with experiment but does not move downward fast enough. Airloads were computed using both the classical rigid wake assumption and the distorted tip vortex geometry obtained from the computer program. When compared with experimental airloads measurements the rigid wake airloads give better results than the distorted wake airloads. (Author).
Author : T. Alan Egolf
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (317 download)
Download or read book Helicopter Rotor Wake Geometry and Its Influence in Forward Flight. Volume 2: Wake Geometry Charts written by T. Alan Egolf and published by . This book was released on 1983 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Alan Egolf
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (18 download)
Download or read book Helicopter Rotor Wake Geometry and Its Influence in Forward Flight written by T. Alan Egolf and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. Gene Sadler
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (31 download)
Download or read book Main Rotor Free Wake Geometry Effects on Blade Air Loads and Response for Helicopters in Steady Maneuvers written by S. Gene Sadler and published by . This book was released on 1972 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Alan Egolf
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (689 download)
Download or read book Helicopter Rotor Wake Geometry and Its Influence in Forward Flight: Generalized wake geometry and wake effect on rotor airloads and performance written by T. Alan Egolf and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Alan Egolf
Publisher :
ISBN 13 :
Total Pages : 197 pages
Book Rating : 4.:/5 (841 download)
Download or read book Helicopter Rotor Wake Geometry and Its Influence in Forward Flight written by T. Alan Egolf and published by . This book was released on 1983 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John C. Wilson
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (31 download)
Download or read book Experimental Evaluation of a Flat Wake Theory for Predicting Rotor Inflow-wake Velocities written by John C. Wilson and published by . This book was released on 1992 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wayne Johnson
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (317 download)
Download or read book Comparison of Calculated and Measured Model Rotor Loading and Wake Geometry written by Wayne Johnson and published by . This book was released on 1980 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.:/5 (317 download)
Download or read book Main Rotor Free Wake Geometry Effects on Blade Air Loads and Response for Helicopters in Steady Maneuvers. Volume 2: Program Listings written by and published by . This book was released on 1972 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Joglekar
Publisher :
ISBN 13 :
Total Pages : 217 pages
Book Rating : 4.:/5 (227 download)
Download or read book An Actuator-Disc Analysis of Helicopter Wake Geometry and the Corresponding Blade Response written by M. Joglekar and published by . This book was released on 1970 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is assumed that a helicopter rotor in forward flight can be represented by a flat plate. Expressions are developed relating the pressure field to the steady aerodynamic thrust and moment and the time-dependent flapping moment. This pressure field satisfies the zero pressure condition at the center and edge of the disc, the first and second harmonic variation in lift, and Laplace's equation. A computer program was written to calculate the velocity field and streamlines. Two sample cases corresponding to high- and low- speed conditions for the UH-1 rotor were chosen for computation. Both cases showed the tip-vortex phenomenon. In order to examine the sensitivity of blade load calculations to wake geometry, an existing airloads program was modified to accept the computed wake geometry. A comparison of results of this modified program with experimental data indicated that the effect of distorted wake is greater at low advance ratios than at high advance ratios. The reduced sensitivity at high advance ratios may be due to the wake being blown farther behind the rotor and/or the predominance of other aeroelastic parameters.
