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Computation Of Rotor Aerodynamic Loads In Forward Flight Using A Full Span Free Wake Analysis
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722972912 Total Pages :142 pages Book Rating :4.9/5 (729 download)
Book Synopsis Computation of Rotor Aerodynamic Loads in Forward Flight Using a Full-Span Free Wake Analysis by : National Aeronautics and Space Administration (NASA)
Download or read book Computation of Rotor Aerodynamic Loads in Forward Flight Using a Full-Span Free Wake Analysis written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of an advanced computational analysis of unsteady aerodynamic loads on isolated helicopter rotors in forward flight is described. The primary technical focus of the development was the implementation of a freely distorting filamentary wake model composed of curved vortex elements laid out along contours of constant vortex sheet strength in the wake. This model captures the wake generated by the full span of each rotor blade and makes possible a unified treatment of the shed and trailed vorticity in the wake. This wake model was coupled to a modal analysis of the rotor blade dynamics and a vortex lattice treatment of the aerodynamic loads to produce a comprehensive model for rotor performance and air loads in forward flight dubbed RotorCRAFT (Computation of Rotor Aerodynamics in Forward Flight). The technical background on the major components of this analysis are discussed and the correlation of predictions of performance, trim, and unsteady air loads with experimental data from several representative rotor configurations is examined. The primary conclusions of this study are that the RotorCRAFT analysis correlates well with measured loads on a variety of configurations and that application of the full span free wake model is required to capture several important features of the vibratory loading on rotor blades in forward flight. Quackenbush, Todd R. and Bliss, Donald B. and Wachspress, Daniel A. and Boschitsch, Alexander H. and Chua, Kiat Unspecified Center AERODYNAMIC LOADS; COMPUTATIONAL FLUID DYNAMICS; HELICOPTERS; HORIZONTAL FLIGHT; ROTARY WINGS; ROTOR AERODYNAMICS; ROTOR DYNAMICS; WAKES; UNSTEADY AERODYNAMICS; VIBRATORY LOADS; VORTEX SHEETS; VORTICES...
Book Synopsis Computation of Rotor Aerodynamic Loads in Forward Flight Using a Full-span Free Wake Analysis by :
Download or read book Computation of Rotor Aerodynamic Loads in Forward Flight Using a Full-span Free Wake Analysis written by and published by . This book was released on 1990 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical Model of Rotor Wake Aerodynamics in Ground Effect by :
Download or read book Analytical Model of Rotor Wake Aerodynamics in Ground Effect written by and published by . This book was released on 1983 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Free Wake Techniques for Rotor Aerodynamic Analysis. Volume 1: Summary of Results and Background Theory by :
Download or read book Free Wake Techniques for Rotor Aerodynamic Analysis. Volume 1: Summary of Results and Background Theory written by and published by . This book was released on 1982 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wake Geometry Measurements and Analytical Calculations on a Small-Scale Rotor Model by : Terence A. Ghee
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:
Book Synopsis Development and Application of a Method for Predicting Rotor Free Wake Positions and Resulting Rotor Blade Air Loads by : S. Gene Sadler
Download or read book Development and Application of a Method for Predicting Rotor Free Wake Positions and Resulting Rotor Blade Air Loads written by S. Gene Sadler and published by . This book was released on 1971 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotor wake geometries are predicted by a process similar to the startup of a rotor in a free stream. An array of discrete trailing and shed vortices is generated with vortex strengths corresponding to stepwise radial and azimuthal blade circulations. The array of shed and trailing vortices is limited to an arbitrary number of azimuthal steps behind each blade. The remainder of the wake model of each blade is an arbitrary number of trailing vortices. Vortex element end points were allowed to be transported by the resultant velocity of the free stream and vortex-induced velocities. Wake geometry, wake flow, and wake-induced velocity influence coefficients are generated by this program for use in the blade loads portion of the calculations. Blade loads computations include the effects of nonuniform inflow due to a free wake, nonlinear airfoil characteristics, and response of flexible blades to the applied loads. Computed wake flows and blade loads are compared with experimentally measured data. Predicted blade loads, response and shears and moments are obtained for a model rotor system having two independent rotors. The effects of advance ratio, vertical separation of rotors, different blade radius ratios, and different azimuthal spacing of the blades of one rotor with respect to the other are investigated.
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1994 with total page 1828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722235536 Total Pages :54 pages Book Rating :4.2/5 (355 download)
Book Synopsis Analysis of Rotor Vibratory Loads Using Higher Harmonic Pitch Control by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of Rotor Vibratory Loads Using Higher Harmonic Pitch Control written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies of isolated rotors in forward flight have indicated that higher harmonic pitch control can reduce rotor noise. These tests also show that such pitch inputs can generate substantial vibratory loads. The modification is summarized of the RotorCRAFT (Computation of Rotor Aerodynamics in Forward flighT) analysis of isolated rotors to study the vibratory loading generated by high frequency pitch inputs. The original RotorCRAFT code was developed for use in the computation of such loading, and uses a highly refined rotor wake model to facilitate this task. The extended version of RotorCRAFT incorporates a variety of new features including: arbitrary periodic root pitch control; computation of blade stresses and hub loads; improved modeling of near wake unsteady effects; and preliminary implementation of a coupled prediction of rotor airloads and noise. Correlation studies are carried out with existing blade stress and vibratory hub load data to assess the performance of the extended code. Quackenbush, Todd R. and Bliss, Donald B. and Boschitsch, Alexander H. and Wachspress, Daniel A. Unspecified Center...
Download or read book Aeronautical Engineering written by and published by . This book was released on 1993 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation and Comparison of Symmetrical/supercritical Airfoils for the Near Tip Region of a Helicopter in Forward Flight by : F. F. Badavi
Download or read book Numerical Simulation and Comparison of Symmetrical/supercritical Airfoils for the Near Tip Region of a Helicopter in Forward Flight written by F. F. Badavi and published by . This book was released on 1989 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Summary of the Development of Integral Aerodynamic Methods for the Computation of Rotor Wake Interactions by : J. M. Summa
Download or read book A Summary of the Development of Integral Aerodynamic Methods for the Computation of Rotor Wake Interactions written by J. M. Summa and published by . This book was released on 1986 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the research reported here is to develop basic methodology for a generalized forward flight aerodynamic analysis method for isolates rotors. All of the work thus far has been concerned with the development of integral methods. Efforts have concentrated on analytical modeling studies and code development for fundamental vortex/blade interactions that occur in forward flight. Calculations show that vortex core deformations can be simulated but that numerical errors in the core growth should be removed in order to study such phenomena as bursting. The computed trajectory of a tip vortex passing another wing is also validated with experiment as well as the prediction of vortex induced separations. The calculation of the rotor wake in hover has been improved and the importance of secondary vortex roll ups for a modern rotor is discussed. Finally, a time stepping panel method has been formulated and verified by application to impulsively started wings. A pilot code version for unsteady rotor motions is described along with its preliminary application to a two bladed rotor.
Book Synopsis Analysis of Rotor Wake Aerodynamics During Maneuvering Flight Using a Free-vortex Wake Methodology by :
Download or read book Analysis of Rotor Wake Aerodynamics During Maneuvering Flight Using a Free-vortex Wake Methodology written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rotary-Wing Aerodynamics by : W. Z. Stepniewski
Download or read book Rotary-Wing Aerodynamics written by W. Z. Stepniewski and published by Courier Corporation. This book was released on 2013-04-22 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: DIVClear, concise text covers aerodynamic phenomena of the rotor and offers guidelines for helicopter performance evaluation. Originally prepared for NASA. Prefaces. New Indexes. 10 black-and-white photos. 537 figures. /div
Download or read book NASA SP. written by and published by . This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Free Wake Techniques for Rotor Aerodynamic Analysis. Volume 3: Vortex Filament Models by :
Download or read book Free Wake Techniques for Rotor Aerodynamic Analysis. Volume 3: Vortex Filament Models written by and published by . This book was released on 1982 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
