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Thursday, July 16, 2020 | History

3 edition of Compressible, unsteady, lifting-surface theory for a helicopter rotor in forward flight found in the catalog.

Compressible, unsteady, lifting-surface theory for a helicopter rotor in forward flight

Compressible, unsteady, lifting-surface theory for a helicopter rotor in forward flight

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Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Rotors (Helicopters)

  • Edition Notes

    Microfiche. [Washington, D.C.? : National Aeronautics and Space Administration], 1986. 1 microfiche.

    Other titlesCompressible, unsteady, lifting surface theory for a helicopter rotor in forward flight.
    StatementHarry L. Runyan and Hsiang Tai.
    SeriesNASA technical paper -- 2503.
    ContributionsTai, H., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15296514M

    A three-surface aircraft or sometimes three-lifting-surface aircraft has a foreplane, a central wing and a central wing surface always provides lift and is usually the largest, while the functions of the fore and aft planes may vary between types and may include lift, control and/or stability. Lifting line theory is applicable only to wings of large aspect ratio of approximately four or more. For wings of lower aspect ratio we should resort to a lifting surface theory, which involves finding a potential flow to satisfy the Kutta condition all along the span but at the same time satisfying the boundary condition that the normal velocity components vanish every­where on the wing surface.

    limit the analysis to helicopter rotors of an assumed flat rotor plane. However, Peters’s use of continuous spatial and temporal basis func-tions for representing the wake is analogous to the method outlined in this manuscript. Instead, we use a superposition of horseshoe vortices and 2D unsteady blade-element theory to represent the full 3D File Size: KB. 2. Active lifting surface on a rigid fuselage The purpose of the following discussion is to provide an initial insight into the effectiveness of the proposed methodology by exploring the feasibility of an active lifting surface which is located over an infinitely rigid fuselage of a helicopter in forward flight.

    Linearized Lifting Surface Theory | Thin-Wing Theory y U y=y(x)u - /2 x /2 y=yL(x) Assume thin wing, small angle of attack: yU l; yL l File Size: KB. This is an ideal book for graduate students and researchers interested in the aerodynamics, structural dynamics and flight dynamics of small birds, bats and insects, as well as of micro air vehicles (MAVs), which present some of the richest problems intersecting science and by:


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Compressible, unsteady, lifting-surface theory for a helicopter rotor in forward flight Download PDF EPUB FB2

The helicopter rotor in forward flight encounters three-dimensional, unsteady, transonic, viscous aerodynamic phenomena. Rotary-wing problems provide a stimulus for development and opportunities for application of the most advanced computational techniques.

Get this from a library. Compressible, unsteady lifting-surface theory for a helicopter rotor in forward flight.

[Harry L Runyan; H Tai; United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.]. Compressible, unsteady, lifting-surface lifting-surface theory for a helicopter rotor in forward flight book for a helicopter rotor in forward flight.

[Washington, DC]: [Springfield, Va: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; For sale by the National Technical Information Service] MLA Citation.

Runyan, Harry L. and Tai, H. and United States. ♥ Book Title: Compressible, Unsteady Lifting-surface Theory for a Helicopter Rotor in Forward Flight ♣ Name Author: Harry L. Runyan ∞ Launching: Info ISBN Link: NASA ⊗ Detail ISBN code: ⊕ Number Pages: Total 21 sheet ♮ News id: dJ4TAQAAIAAJ Download File Start Reading.

Abstract. The objective of this work is to review some recent advances in a boundary-integral-equation method developed by the authors and their collaborators for the aerodynamic analysis of unsteady, potential, subsonic flows around bodies having arbitrary motion, with applications to helicopter rotors in hover and forward : L.

Morino, M. Gennaretti. Unsteady lifting surface theory applied to lifting-surface theory for a helicopter rotor in forward flight book propeller and helicopter rotor This item was submitted to Loughborough University's Institutional Repository by the/an author.

Additional Information: • A Doctoral Thesis. Submitted in partial ful lment of the requirements for the award of Doctor of Philosophy of Loughborough Universit.y. Compressible, unsteady lifting-surface theory for a helicopter rotor in forward flight / (Washington, D.C.: National Aeronautics and Space Administration, Scientific and.

Morino, L., Freedman, M. I., and Tseng, K.: “Unsteady Three-Dimensional Compressible Potential Aerodynamics of Helicopter Rotors in Hover and Forward Flight — A Boundary Element Formulation,” American Helicopter Society National Specialist Meeting on Aerodynamics and Aeroacoustics, Arlington, TX, USA, ().

Google ScholarCited by: 4. Lifting Surface Theory For A Helicopter Rotor In Forward Flight Authors / Details: H. Tai and Harry L.

Runyan, NASA Langley. In particular unsteady lifting surface theory is a basis for many advanced theoretical approaches in this field.

Notwithstanding the ability of analytical methods to provide an answer, care must be exercised in the interpretation of the results, since these are particularly influenced by factors such as wake scaling procedures, the description.

A single rotor blade in forward flight; a top view. (a) Advancing and retreating sides of the rotor disk. Here the velocity V is the absolute velocity of the helicopter. (b) Definition of lag and flap angles. (c) Lift and drag in forward flight; here α is the blade angle of attack measured from the line of zero by: Unsteady lifting surface theory applied to a propeller and helicopter rotor TZ (GMT) by Harry L.

Runyan This thesis is concerned with the development of a theory for determining the aerodynamic forces for unsteady, compressible subsonic flow on a propeller and helicopter by: 6. Unsteady Lifting Surface Theory for Single Rotation Propellers' [13].

The report provides background on a code, UPROP3S, that has been developed for the unsteady aerodynamic and aeroelastic analysis of advanced turboprops. Further information on the use of that code is given in a user's manual [14]. The treatment of the blade boundaryFile Size: 1MB.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Cited by: The Caradonna & Tung's rotor blade was selected to analyze the unsteady aerodynamics in hovering and non-lift forward flight.

Also, the AH-1G rotor blade was selected in forward flight. In forward. Harry L. Runyan has written: 'Compressible, unsteady lifting-surface theory for a helicopter rotor in forward flight' -- subject(s): Rotary wings, Rotors (Helicopters) 'Theoretical investigation.

A review of helicopter rotor blade tip design technology has been carried out with a view to undertaking subsequent computations to evaluate the performance of new tip designs. Written at a basic level, this text starts from first principles and moves fluidly onward from simple to more complex systems.

Gain Valuable Insight on Helicopter Theory Divided into 11 chapters, this text covers historical development, hovering and vertical flight, simplified rotor blade model in. Keywords: unsteady aerodynamics, potential flow, lifting surface, panel method, free-wake model, main helicopter rotor aerodynamics 1.

INTRODUCTION One of the most important challenges in helicopter aerodynamics is the accurate prediction of rotor loads, especially in forward flight. Helicopter rotor aerodynamic flow field is veryCited by: 1. Experimental investigation of rotor/lifting surface interactions. A comprehensive PIV measurement campaign on a fully equipped helicopter model.

14 September | Experiments in Fluids, Vol. 53, No. 1 Investigation of Rotor-Rotor Interactions for Two Helicopters in Forward Flight Using Free-Vortex Wake by: 3. lifting-surface theory, but have not carried the results far enough to obtain actual flap-induced loadings. This report gathers the results of lifting-surface theory and.

the flap pressure modes, extending them where necessary, to present a procedure that will allow researchers to use the ideasFile Size: KB.Theory of the Aerodynamic Interference a Helicopter Rotor Blade and a and Wing in Hovering and For- ward Flight By A.

R. S. Bramwell,Ph.D. with Appendix B on some Experimental Measurements By J. B. on, (Eng.) Reports and Memoranda No. " June, Size: 3MB.Rotor/Fuselage Unsteady Aerodynamic Interaction Problem Liu Dawei1, Xin Ji2, Huang Jun1 INTRODUCTION The rotor unsteady aerodynamic interaction is one of the research hotspots of rotorcraft.

It not only has a great influence on aerodynamic general layout designing of helicopter, but also plays a more and more important role in helicopter flightAuthor: Liu Dawei, Xin Ji, Huang Jun.