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ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (317 download)
Download or read book Effects of Blade-vane Ratio and Rotor-stator Spacing of Fan Noise with Forward Velocity written by and published by . This book was released on 1981 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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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:
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ISBN 13 :
Total Pages : 628 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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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 : M. J. Benzakein
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ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (31 download)
Download or read book Study Program for Lift Fan Noise Reduction and Suppression written by M. J. Benzakein and published by . This book was released on 1970 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 892 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 166 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 written by and published by . This book was released on 1980 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harvey H. Hubbard
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ISBN 13 :
Total Pages : 616 pages
Book Rating : 4.:/5 (52 download)
Download or read book Aeroacoustics of Flight Vehicles written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph R. Balombin
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ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.F/5 ( download)
Download or read book Effect of Rotor-to-stator Spacing on Acoustic Performance of a Full-scale Fan (QF-5) for Turbofan Engines written by Joseph R. Balombin and published by . This book was released on 1974 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720522461
Total Pages : 58 pages
Book Rating : 4.5/5 (224 download)
Download or read book Far-Field Acoustic Characteristics of Multiple Blade-Vane Configurations for a High Tip Speed Fan 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 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The acoustic characteristics of a model high-speed fan stage were measured in the NASA Glenn 9- by 15-Foot Low Speed Wind Tunnel at takeoff and approach flight conditions. The fan was designed for a corrected rotor tip speed of 442 m/s (1450 ft/s), and had a powered core, or booster stage, giving the model a nominal bypass ratio of 5. A simulated engine pylon and nozzle bifurcation was contained within the bypass duct. The fan stage consisted of all combinations of 3 possible rotors, and 3 stator vane sets. The 3 rotors were (1) wide chord, (2) forward swept, and (3) shrouded. The 3 stator sets were (1) baseline, moderately swept, (2) swept and leaned, and (3) swept integral vane/frame which incorporated some of the swept and leaned features as well as eliminated the downstream support structure. The baseline configuration is considered to be the wide chord rotor with the radial vane stator. A flyover Effective Perceived Noise Level (EPNL) code was used to generate relative EPNL values for the various configurations. The swept and leaned stator showed a 3 EPNdB reduction at lower fan speeds relative to the baseline stator; while the swept integral vane/frame stator showed lowest noise levels at high fan speeds. The baseline, wide chord rotor was typically the quietest of the three rotors. A tone removal study was performed to assess the acoustic benefits of removing the fundamental rotor interaction tone and its harmonics. Reprocessing the acoustic results with the bypass tone removed had the most impact on reducing fan noise at transonic rotor speeds. Removal of the bypass rotor interaction tones (BPF and nBPF) showed up to a 6 EPNdB noise reduction at transonic rotor speeds relative to noise levels for the baseline (wide chord rotor and radial stator; all tones present) configuration.Woodward, Richard P. and Gazzaniga, John A. and Hughes, ChristopherGlenn Research CenterAIRCRAFT NOISE; AEROACOUSTICS; ROTOR AERODYNAMICS; ROTOR SPEED; NOISE INTENSITY; BYPASS RATIO;
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ISBN 13 :
Total Pages : 310 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1982 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. A. Kantola
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (292 download)
Download or read book Effects of Vane/blade Ratio and Spacing on Fan Noise written by R. A. Kantola and published by . This book was released on 1981 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (317 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:
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ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (31 download)
Download or read book Effects of Long-chord Acoustically Treated Stator Vanes on Fan Noise: Effect of long chord (taped stator) written by and published by . This book was released on 1975 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harvey H. Hubbard
Publisher :
ISBN 13 :
Total Pages : 612 pages
Book Rating : 4.:/5 (7 download)
Download or read book Aeroacoustics of Flight Vehicles: Noise sources written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721023172
Total Pages : 32 pages
Book Rating : 4.0/5 (231 download)
Download or read book The Noise of a Forward Swept Fan written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-11 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A forward swept fan, designated the Quiet High Speed Fan (QHSF), was tested in the NASA Glenn 9-by 15-foot Low Speed Wind Tunnel to investigate its noise reduction relative to a baseline fan of the same aerodynamic performance. The objective of the Quiet High Speed Fan was a 6 decibel reduction in the Effective Perceived Noise relative to the baseline fan at the takeoff condition. The intent of the Quiet High Speed Fan design was to provide both a multiple pure tone noise reduction from the forward sweep of the fan rotor and a rotor-stator interaction blade passing tone noise reduction from a leaned stator. The tunnel noise data indicted that the Quiet High Speed Fan was quieter than the baseline fan for a significant portion of the operating line and was 6 dB quieter near the takeoff condition. Although reductions in the multiple pure tones were observed, the vast majority of the EPNdB reduction was a result of the reduction in the blade passing tone and its harmonics. The baseline fan's blade passing tone was dominated by the rotor-strut interaction mechanism. The observed blade passing tone reduction could be the result of either the redesign of the Quiet High Speed Fan Rotor or the redesigned stator. The exact cause of this rotor-strut noise reduction, whether from the rotor or stator redesign, was not discernable from this experiment.Dittmar, James H. and Elliott, David M. and Fite, E. BrianGlenn Research CenterAERODYNAMIC NOISE; LOW SPEED WIND TUNNELS; FAN BLADES; AIRCRAFT DESIGN; AEROACOUSTICS; ROTOR STATOR INTERACTIONS; VANES; AIRCRAFT WAKES; SUPERSONIC SPEED; PROPELLER NOISE; STRUTS
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721973460
Total Pages : 560 pages
Book Rating : 4.9/5 (734 download)
Download or read book Design of a Low Speed Fan Stage for Noise Suppression written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the design of a low tip speed, moderate pressure rise fan stage for demonstration of noise reduction concepts. The fan rotor is a fixed-pitch configuration delivering a design pressure ratio of 1.378 at a specific flow of 43.1 lbm/sec/sq ft. Four exit stator configurations were provided to demonstrate the effectiveness of circumferential and axial sweep in reducing rotor-stator interaction tone noise. The fan stage design was combined with an axisymmetric inlet, conical convergent nozzle, and nacelle to form a powered fan-nacelle subscale model. This model has a 22-inch cylindrical flow path and employs a rotor with a 0.30 hub-to-tip radius ratio. The design is fully compatible with an existing NASA force balance and rig drive system. The stage aerodynamic and structural design is described in detail. Three-dimensional (3-D) computational fluid dynamics (CFD) tools were used to define optimum airfoil sections for both the rotor and stators. A fan noise predictive system developed by Pratt & Whitney under contract to NASA was used to determine the acoustic characteristics of the various stator configurations. Parameters varied included rotor-to-stator spacing and vane leading edge sweep. The structural analysis of the rotor and stator are described herein. An integral blade and disk configuration was selected for the rotor. Analysis confirmed adequate low cycle fatigue life, vibratory endurance strength, and aeroelastic suitability. A unique load carrying stator arrangement was selected to minimize generation of tonal noise due to sources other than rotor-stator interaction. Analysis of all static structural components demonstrated adequate strength, fatigue life, and vibratory characteristics. Dalton, W. N. and Elliot, D. B. and Nickols, K. L. Glenn Research Center NAS3-25950; RTOP 538-03-11...
