Wakes of Lifting Propellers (rotors) in Ground Effect

Wakes of Lifting Propellers (rotors) in Ground Effect
Title Wakes of Lifting Propellers (rotors) in Ground Effect PDF eBook
Author F. A. DuWaldt
Publisher
Pages 110
Release 1966
Genre Rotors (Helicopters)
ISBN

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The report presents the development of a wake model for a lifting propeller (rotor) in ground effect and the computational procedure used to determine the spacial distribution of wake vorticity and the induced velocity field accompanying that vorticity distribution. Sample calculations for a two-bladed rotor were carried out on an IBM 7044 computer. Locations of wake vortical elements and the associated induced velocities at selected field points are presented for advance ratios of 0, 0.02, 0.05, and 0.10 for an H/R (ratio of rotor height above ground to rotor radius) of 1.0. Also, a few results for a hovering case with H/R = 0.5 are presented. A calculated root-mean-square velocity map is compared with measured hovering data (time averaged) and good agreement is obtained in the outer half of the slipstream. The implications of computed results with respect to the flow field at a horizontal stabilizer or tail rotor are noted as examples of the use of the model. The wake vortex model used for these calculations is a distorted continuous helix emanating from each blade tip. (Author).

Analytical Model of Rotor Wake Aerodynamics in Ground Effect

Analytical Model of Rotor Wake Aerodynamics in Ground Effect
Title Analytical Model of Rotor Wake Aerodynamics in Ground Effect PDF eBook
Author
Publisher
Pages 200
Release 1983
Genre
ISBN

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Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Title Scientific and Technical Aerospace Reports PDF eBook
Author
Publisher
Pages 1278
Release 1984
Genre Aeronautics
ISBN

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Technical Abstract Bulletin

Technical Abstract Bulletin
Title Technical Abstract Bulletin PDF eBook
Author Defense Documentation Center (U.S.)
Publisher
Pages 784
Release 1967
Genre Science
ISBN

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Principles of Helicopter Aerodynamics with CD Extra

Principles of Helicopter Aerodynamics with CD Extra
Title Principles of Helicopter Aerodynamics with CD Extra PDF eBook
Author Gordon J. Leishman
Publisher Cambridge University Press
Pages 860
Release 2006-04-24
Genre Science
ISBN 9780521858601

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Written by an internationally recognized teacher and researcher, this book provides a thorough, modern treatment of the aerodynamic principles of helicopters and other rotating-wing vertical lift aircraft such as tilt rotors and autogiros. The text begins with a unique technical history of helicopter flight, and then covers basic methods of rotor aerodynamic analysis, and related issues associated with the performance of the helicopter and its aerodynamic design. It goes on to cover more advanced topics in helicopter aerodynamics, including airfoil flows, unsteady aerodynamics, dynamic stall, and rotor wakes, and rotor-airframe aerodynamic interactions, with final chapters on autogiros and advanced methods of helicopter aerodynamic analysis. Extensively illustrated throughout, each chapter includes a set of homework problems. Advanced undergraduate and graduate students, practising engineers, and researchers will welcome this thoroughly revised and updated text on rotating-wing aerodynamics.

Effect of Ground And/or Ceiling Planes on Thrust of Rotors in Hover

Effect of Ground And/or Ceiling Planes on Thrust of Rotors in Hover
Title Effect of Ground And/or Ceiling Planes on Thrust of Rotors in Hover PDF eBook
Author
Publisher
Pages 46
Release 1985
Genre
ISBN

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Helicopter Theory

Helicopter Theory
Title Helicopter Theory PDF eBook
Author Wayne Johnson
Publisher Courier Corporation
Pages 1122
Release 2012-03-07
Genre Technology & Engineering
ISBN 0486131823

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Monumental engineering text covers vertical flight, forward flight, performance, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, stall, noise, and more. 189 illustrations. 1980 edition.