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Rotor Induced Inflow Ratio Measurements And Camrad Comprehensive Analytical Model Of Rotorcraft Aerodynamics And Dynamics Calculations
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Book Synopsis Rotor Induced-Inflow-Ratio Measurements and CAMRAD (Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics) Calculations by :
Download or read book Rotor Induced-Inflow-Ratio Measurements and CAMRAD (Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics) Calculations written by and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparison of the inflow calculations between an analytical rotor- wake method and rotor-inflow measurements using a laser velocimeter has been presented. The inflow measurements were made above a four-bladed rotor system using rectangular planform blades operating in forward flight at a thrust coefficient of 0.0064 and at rotor advance ratios of 0.15, 0.23, and 0.30. The experimental measurements showed that as the advance ratio u increased, the induced-upflow region moved progressively from the forward 20 percent of the rotor disc at u=0.15 to a point where it covered most of the forward half of the rotor disc at u=0.30. The induced-inflow characteristics at all advance ratios were unsymmetrical about the longitudinal centerline. The comparisons with the analytical method CAMRAD (Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics) show that the region of induced upflow over the rotor disc was effectively modeled only at u=0.15. The importance of the choice of rotor-trim option is examined, and results of two trim selections are detailed. Keywords: Helicopter wake; Helicopter inflow; CAMRAD; Blade-tip vortices; Laser velocimeter.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722747794 Total Pages :28 pages Book Rating :4.7/5 (477 download)
Book Synopsis Rotor Induced-Inflow-Ratio Measurements and Camrad Calculations by : National Aeronautics and Space Administration (NASA)
Download or read book Rotor Induced-Inflow-Ratio Measurements and Camrad Calculations written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparison of the inflow calculations between an analytical rotor wake method and rotor inflow measurements using a laser velocimeter was presented. The inflow measurements were made near a 4-bladed rotor system using rectangular planform blades operating in forward flight at a thrust coefficient of 0.0064, and at 3 rotor advance ratios: 0.15, 0.23, and 0.30. The inflow measurements were made at azimuthal increments of 30 degrees at 3.0 inches (approximately 1 chord) above the plane formed by the tips of the blades, and radial locations from 20 to 110 percent of blade span. The experimental measurements showed that as the advance ratio (m) increased, the induced upflow region moved progressively from the forward 20 percent of the rotor disc at m = 0.15 to covering most of the forward half of the rotor disc at m = 0.30. The induced inflow characteristics at all advance ratios were found to be unsymmetrical about the longitudinal centerline. The maximum downwash was found to be in the rear portion of the disc and skewed toward the advancing blade side. The comparisons with the analytical method Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics (CAMRAD) show that the region of induced upflow over the rotor disc was effectively modeled only at the advance ratio of 0.15. The method consistently indicated the largest values of induced inflow ratio to be on the retreating-blade side of the rotor disc (opposite from that measured). The importance of the choice of rotor trim option is examined and results of two trim selections are detailed. Hoad, Danny R. Langley Research Center DA PROJ. 1L1-62211-A-47-AA; RTOP 505-61-51-10...
Book Synopsis Rotor Induced-inflow-ratio Measurements and CAMRAD Calculations by : Danny R. Hoad
Download or read book Rotor Induced-inflow-ratio Measurements and CAMRAD Calculations written by Danny R. Hoad and published by . This book was released on 1990 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by and published by . This book was released on 1990 with total page 660 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 1994 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part 1: Analysis Development by :
Download or read book A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part 1: Analysis Development written by and published by . This book was released on 1980 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of a comprehensive analytical model of rotorcraft aerodynamics and dynamics is presented. This analysis is designed to calculate rotor performance, loads, and noise; helicopter vibration and gust response; flight dynamics and handling qualities; and system aeroelastic stability. The analysis is a combination of structural, inertial, and aerodynamic models that is applicable to a wide range of problems and a wide class of vehicles. The analysis is intended for use in the design, testing, and evaluation of rotors and rotorcraft, and to be a basis for further development of rotary wing theories. The analysis is implemented in a digital computer program. (Author).
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 A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part 2: User's Manual by :
Download or read book A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part 2: User's Manual written by and published by . This book was released on 1980 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part II. User's Manual by : Wayne Johnson
Download or read book A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part II. User's Manual written by Wayne Johnson and published by . This book was released on 1980 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of a comprehensive analytical model of rotorcraft aerodynamics and dynamics is described. This analysis is designed to calculate rotor performance, loads, and noise; the helicopter vibration and gust response; the flight dynamics and handling qualities; and the system aeroelastic stability. The analysis is a combination of structural, inertial, and aerodynamic models, that is applicable to a wide range of problems and a wide class of vehicles. The analysis is intended for use in the design, testing and evaluation of rotors and rotorcraft, and to be a basis for further development of rotary wing theories. This report describes the use of the computer program that implements the analysis. (Author).
Book Synopsis NASA Technical Paper by : United States. National Aeronautics and Space Administration
Download or read book NASA Technical Paper written by United States. National Aeronautics and Space Administration and published by . This book was released on 1990 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP. written by and published by . This book was released on 1993 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part 3: Program Manual by :
Download or read book A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part 3: Program Manual written by and published by . This book was released on 1980 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part III. Program Manual by : Wayne Johnson
Download or read book A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics. Part III. Program Manual written by Wayne Johnson and published by . This book was released on 1980 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: The computer program for a comprehensive analytical model of rotorcraft aerodynamics and dynamics is described. This analysis is designed to calculate rotor performance, loads, and noise; the helicopter vibration and gust response; the flight dynamics and handling qualities; and the system aeroelastic stability. The analysis is a combination of structural, inertial, and aerodynamic models, that is applicable to a wide range of problems and a wide class of vehicles. The analysis is intended for use in the design, testing, and evaluation of rotors and rotorcraft, and to be a basis for further development of rotary wing theories. This report documents the computer program that implements the analysis. (Author).
Book Synopsis NASA Scientific and Technical Publications by :
Download or read book NASA Scientific and Technical Publications written by and published by . This book was released on 1991 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis and Comparison with Theory of Flow-field Measurements Near a Lifting Rotor in the Langley Full-scale Tunnel by : Harry H. Heyson
Download or read book Analysis and Comparison with Theory of Flow-field Measurements Near a Lifting Rotor in the Langley Full-scale Tunnel written by Harry H. Heyson and published by . This book was released on 1956 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of an investigation in the Langley full-scale tunnel of the induced flow near a lifting rotor are given. Measurements of stream angles and velocities were made in several transverse planes along and behind the rotor in four different conditions representative of the cruising and high-speed ranges of flight. These measurements indicate that available theory may be used to calculate with reasonable accuracy the induced flow over the forward three-quarters of the disk for these flight conditions provided that a realistic nonuniform rotor disk-load distribution is assumed. Rearward of the three-quarter-diameter point, calculations of the induced velocity are increasingly inaccurate due to the rolling up of the trailing-vortex system. Farther rearward, well behind the rotor, the flow may be represented more accurately by the flow behind a uniformly loaded wing.
Book Synopsis A Survey of Nonuniform Inflow Models for Rotorcraft Flight Dynamics and Control Applications by :
Download or read book A Survey of Nonuniform Inflow Models for Rotorcraft Flight Dynamics and Control Applications written by and published by . This book was released on 1989 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 568 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).
