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Author : D. Hawkings
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (489 download)
Download or read book Transonic Fan Noise written by D. Hawkings and published by . This book was released on 1972 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Arthur V. Saule
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (31 download)
Download or read book Some Observations about the Components of Transonic Fan Noise from Narrow-band Spectral Analysis written by Arthur V. Saule and published by . This book was released on 1974 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. A. Lordi
Publisher :
ISBN 13 :
Total Pages : 51 pages
Book Rating : 4.:/5 (227 download)
Download or read book Theoretical Studies on Fan Noise Generation by a Transonic Compressor Blade Row written by J. A. Lordi and published by . This book was released on 1974 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: A program of theoretical research on discrete-tone noise generation in transonic flows through fan and compressor blade rows is summarized. The sound field produced by an isolated rotor in an infinitely long annular duct with a uniform throughflow was considered. Linearized, three-dimensional analyses for the flow through lifting and nonlifting blade rows were used to relate the sound field to the blade thickness and loading distributions. Expressions were derived for the acoustic intensity within the duct and the sound pressure field outside the duct. Computational methods were then developed to evaluate the required reflection coefficients and directivity factors. (Modified author abstract).
Author : James A. Schoenster
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (317 download)
Download or read book Fluctuating Pressures on Fan Blades of a Turbofan Engine, Flight Test Investigation written by James A. Schoenster and published by . This book was released on 1985 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. Mani
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (317 download)
Download or read book Experimental and Theoretical Studies of Subsonic Fan Noise written by R. Mani and published by . This book was released on 1976 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781724753502
Total Pages : 32 pages
Book Rating : 4.7/5 (535 download)
Download or read book Transonic Rotor Noise written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-06 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two complementary methods of describing the high speed rotor noise problem are discussed. The first method uses the second order transonic potential equation to define and characterize the nature of the aerodynamic and acoustic fields and to explain the appearance of radiating shock waves. The second employs the Ffowcs Williams and Hawkings equation to successfully calculate the acoustic far field. Good agreement between theoretical and experimental waveforms is shown for transonic hover tip Mach numbers from 0.8 to 0.9. Schmitz, F. H. and Yu, Y. H. Ames Research Center NASA-TM-81236, A-8342, AVRADCOM-TR-80-A-12 RTOP 992-21-01-90-01
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781723895722
Total Pages : 58 pages
Book Rating : 4.8/5 (957 download)
Download or read book Tfans Tone Fan Noise Design/Prediction System. Volume 3; Evaluation of System Codes written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-21 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: TFANS is the Tone Fan Noise Design/Prediction System developed by Pratt & Whitney under contract to NASA Lewis (presently NASA Glenn). The purpose of this system is to predict tone noise emanating from a fan stage including the effects of reflection and transmission by the rotor and stator and by the duct inlet and nozzle. These effects have been added to an existing annular duct/isolated stator noise prediction capability. TFANS consists of: The codes that compute the acoustic properties (reflection and transmission coefficients) of the various elements and write them to files. Cup3D: Fan Noise Coupling Code that reads these files, solves the coupling problem, and outputs the desired noise predictions. AWAKEN: CFD/Measured Wake Postprocessor which reformats CFD wake predictions and/or measured wake data so it can be used by the system. This volume of the report evaluates TFANS versus full-scale and ADP 22" fig data using the semi-empirical wake modelling in the system. This report is divided into three volumes: Volume 1: System Description, CUP3D Technical Documentation, and Manual for Code Developers; Volume II: User's Manual, TFANS Version 1.4; Volume III: Evaluation of System Codes.Topol, David A.Glenn Research CenterAERODYNAMIC NOISE; FAN BLADES; ROTORS; STATORS; INTERACTIONAL AERODYNAMICS; NOISE PREDICTION (AIRCRAFT); AIRCRAFT NOISE; PROPELLER NOISE; COMPUTER PROGRAMS; INLET NOZZLES; BLADE-VORTEX INTERACTION; ROTOR STATOR INTERACTIONS; USER MANUALS (COMPUTER PROGRAMS); ACOUSTIC PROPERTIES
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781724984456
Total Pages : 30 pages
Book Rating : 4.9/5 (844 download)
Download or read book A Concept for a Counterrotating Fan with Reduced Tone Noise written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-09 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: As subsonic jet engine designs incorporate higher bypass ratios to reduce jet noise and increase engine cycle efficiency, the fan noise becomes a significant part of the perceived total noise. The conventional method of reducing fan tone noise is to design a low tip-speed device. An alternative approach of using a counterrotating fan with a high number of rotor blades is investigated in this report. The source of noise at the blade passing frequency of this device is the rotor-only mechanism, which is cut off for a subsonic tip speed rotor. The interaction noise occurs at twice the blade passing frequency, which, for this fan, was shifted high enough in frequency to be above the perceived noise rating range. The result was a counterrotating fan which had more potential for tone noise reduction than does the conventional fan. A potential broadband noise reduction was also indicated. Dittmar, James H. Glenn Research Center NASA-TM-105736, E-7138, NAS 1.15:105736 RTOP 535-03-10...
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)
Download or read book Evaluation of the Tone Fan Noise Design/Prediction System (TFaNS) at the NASA Glenn Research Center written by and published by . This book was released on 1999 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.3/5 (243 download)
Download or read book Flight Effects of Fan Noise written by and published by . This book was released on 1982 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781723483387
Total Pages : 28 pages
Book Rating : 4.4/5 (833 download)
Download or read book Fluctuating Pressures on Fan Blades of a Turbofan Engine, Flight Test Investigation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Miniature pressure transducers were used to measure the fluctuating pressure on the fan blades of a JT15D engine in flight to aid in understanding fan-noise generation. Although the blade pressures can be considered very useful in determining far-field noise sources in the subsonic fan-blade tip speeds, other mechanisms, and as shock waves in the transonic and supersonic fan-blade tip speeds, limit their usefulness in these higher speed ranges. Schoenster, J. A. Langley Research Center NASA-TP-2381, L-15700, NAS 1.60:2381 RTOP 505-31-33
Author :
Publisher :
ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.:/5 (317 download)
Download or read book Forward Velocity Effects on Fan Noise and the Influence of Inlet Aeroacoustic Design as Measured in the NASA Ames 40 X 80 Foot Wind Tunnel written by and published by . This book was released on 1981 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (317 download)
Download or read book Fan Noise Source Diagnostic Test: Far-Field Acoustic Results written by and published by . This book was released on 2002 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 194 pages
Book Rating : 4.:/5 (317 download)
Download or read book Forward Velocity Effects on Fan Noise and the Suppression Characteristics of Advanced Inlets as Measured in the NASA Ames 40 by 80 Foot Wind Tunnel: Acoustic Data Report written by and published by . This book was released on 1981 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Armour Research Foundation (U.S.)
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (31 download)
Download or read book Controlling Ventilation Noises written by Armour Research Foundation (U.S.) and published by . This book was released on 1957 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721196593
Total Pages : 28 pages
Book Rating : 4.1/5 (965 download)
Download or read book Evaluation of the Tone Fan Noise Design/Prediction System (TFaNS) at the NASA Glenn Research Center written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Version 1.4 of TFaNS, the Tone Fan Noise Design/Prediction System. has recently been evaluated at the NASA Glenn Research Center. Data from tests of the Allison Ultra High Bypass Fan (UHBF) were used to compare to predicted farfield directivities for the radial stator configuration. There was good agreement between measured and predicted directivities at low fan speeds when rotor effects were neglected in the TFaNS calculations. At higher fan speeds, TFaNS is shown to be useful in predicting overall trends rather than absolute sound pressure levels. Koch, L. Danielle Glenn Research Center E-12011
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720522010
Total Pages : 28 pages
Book Rating : 4.5/5 (22 download)
Download or read book Fan Noise Source Diagnostic Test written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-31 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aerodynamic performance of an isolated fan or rotor alone model was measured in the NASA Glenn Research Center 9- by 15- Foot Low Speed Wind Tunnel as part of the Fan Broadband Source Diagnostic Test conducted at NASA Glenn. The Source Diagnostic Test was conducted to identify the noise sources within a wind tunnel scale model of a turbofan engine and quantify their contribution to the overall system noise level. The fan was part of a 1/5th scale model representation of the bypass stage of a current technology turbofan engine. For the rotor alone testing, the fan and nacelle, including the inlet, external cowl, and fixed area fan exit nozzle, were modeled in the test hardware; the internal outlet guide vanes located behind the fan were removed. Without the outlet guide vanes, the velocity at the nozzle exit changes significantly, thereby affecting the fan performance. As part of the investigation, variations in the fan nozzle area were tested in order to match as closely as possible the rotor alone performance with the fan performance obtained with the outlet guide vanes installed. The fan operating performance was determined using fixed pressure/temperature combination rakes and the corrected weight flow. The performance results indicate that a suitable nozzle exit was achieved to be able to closely match the rotor alone and fan/outlet guide vane configuration performance on the sea level operating line. A small shift in the slope of the sea level operating line was measured, which resulted in a slightly higher rotor alone fan pressure ratio at take-off conditions, matched fan performance at cutback conditions, and a slightly lower rotor alone fan pressure ratio at approach conditions. However, the small differences in fan performance at all fan conditions were considered too small to affect the fan acoustic performance.Hughes, Christopher E. and Jeracki, Robert J. and Woodward, Richard P. and Miller, Christopher J.Glenn Research CenterAERODYNAMIC CHARACTERISTI
