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Tfans Tone Fan Noise Design Prediction System Final Report Nasa Cr 1999 208882 Vol1 May 27 1999
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Book Synopsis TFANS TONE FAN NOISE DESIGN/PREDICTION SYSTEM FINAL REPORT... NASA/CR-1999-208882/VOL1... MAY 27, 1999 by : United States. National Aeronautics and Space Administration
Download or read book TFANS TONE FAN NOISE DESIGN/PREDICTION SYSTEM FINAL REPORT... NASA/CR-1999-208882/VOL1... MAY 27, 1999 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tfans Tone Fan Noise Design/prediction System ... Nasa/cr-1999-208884 ... Jul. 9, 1999 by :
Download or read book Tfans Tone Fan Noise Design/prediction System ... Nasa/cr-1999-208884 ... Jul. 9, 1999 written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721015139 Total Pages :78 pages Book Rating :4.0/5 (151 download)
Book Synopsis Tfans Tone Fan Noise Design/Prediction System. Volume 1; System Description, Cup3d Technical Documentation and Manual for Code Developers by : National Aeronautics and Space Administration (NASA)
Download or read book Tfans Tone Fan Noise Design/Prediction System. Volume 1; System Description, Cup3d Technical Documentation and Manual for Code Developers 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 78 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 provides technical background for TFaNS including the organization of the system and CUP3D technical documentation. This document also provides information for code developers who must write Acoustic Property Files in the CUP3D format. This report is divided into three volumes: Volume I: System Description, CUP3D Technical Documentation, and Manual for Code Developers; Volume II: User's Manual, TFaNS Vers. 1.4; Volume III: Evaluation of System Codes.Topol, David A.Glenn Research CenterACOUSTIC PROPERTIES; AERODYNAMIC NOISE; NOISE PREDICTION (AIRCRAFT); AIRCRAFT NOISE; ROTOR BLADES (TURBOMACHINERY); STATOR BLADES; INLET NOZZLES; COUPLING COEFFICIENTS; SCATTERING COEFFICIENTS; COMPUTER PROGRAMS
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721077670 Total Pages :136 pages Book Rating :4.0/5 (776 download)
Book Synopsis TFaNS Tone Fan Noise Design/Prediction System. Volume 2; User's Manual; 1. 4 by : National Aeronautics and Space Administration (NASA)
Download or read book TFaNS Tone Fan Noise Design/Prediction System. Volume 2; User's Manual; 1. 4 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-12 with total page 136 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 provides information on code input and file structure essential for potential users of TFANS. This report is divided into three volumes: Volume 1. System Description, CUP3D Technical Documentation, and Manual for Code Developers; Volume 2. User's Manual, TFANS Vers. 1.4; Volume 3. Evaluation of System Codes. Topol, David A. and Eversman, Walter Glenn Research Center NAS3-26618; NAS3-27727; RTOP 538-03-11
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781723895722 Total Pages :58 pages Book Rating :4.8/5 (957 download)
Book Synopsis Tfans Tone Fan Noise Design/Prediction System. Volume 3; Evaluation of System Codes by : National Aeronautics and Space Adm Nasa
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
Book Synopsis Evaluation of the Tone Fan Noise Design/Prediction System (TFaNS) at the NASA Glenn Research Center by :
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 :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)
Book Synopsis Evaluation of the Tone Fan Noise Design/Prediction System (TFaNS) at the NASA Glenn Research Center by : National Aeronautics and Space Administration (NASA)
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
Book Synopsis Evaluation of the Tone Fan Noise Design/Prediction System (TFaNS) at the NASA Glenn Research Center by : L. Danielle Koch
Download or read book Evaluation of the Tone Fan Noise Design/Prediction System (TFaNS) at the NASA Glenn Research Center written by L. Danielle Koch and published by . This book was released on 1999 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fan Noise Research at NASA written by and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720954941 Total Pages :82 pages Book Rating :4.9/5 (549 download)
Book Synopsis Source Methodology for Turbofan Noise Prediction (Source3d Technical Documentation) by : National Aeronautics and Space Administration (NASA)
Download or read book Source Methodology for Turbofan Noise Prediction (Source3d Technical Documentation) 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 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides the analytical documentation for the SOURCE3D Rotor Wake/Stator Interaction Code. It derives the equations for the rotor scattering coefficients and stator source vector and scattering coefficients that are needed for use in the TFANS (Theoretical Fan Noise Design/Prediction System). SOURCE3D treats the rotor and stator as isolated source elements. TFANS uses this information, along with scattering coefficients for inlet and exit elements, and provides complete noise solutions for turbofan engines. SOURCE3D is composed of a collection of FORTRAN programs that have been obtained by extending the approach of the earlier V072 Rotor Wake/Stator Interaction Code. Similar to V072, it treats the rotor and stator as a collection of blades and vanes having zero thickness and camber contained in an infinite, hardwall annular duct. SOURCE3D adds important features to the V072 capability-a rotor element, swirl flow and vorticity waves, actuator disks for flow turning, and combined rotor/actuator disk and stator/actuator disk elements. These items allow reflections from the rotor, frequency scattering, and mode trapping, thus providing more complete noise predictions than previously. The code has been thoroughly verified through comparison with D.B. Hanson's CUP2D two- dimensional code using a narrow annulus test case.Meyer, Harold D.Glenn Research CenterAPPLICATIONS PROGRAMS (COMPUTERS); NOISE PREDICTION; ROTORS; STATORS; TURBOFAN ENGINES; WAKES; ROTOR AERODYNAMICS; DOCUMENTATION; ACOUSTIC SIMULATION; VORTICITY; FORTRAN; UPWASH; SCATTERING COEFFICIENTS
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721525355 Total Pages :40 pages Book Rating :4.5/5 (253 download)
Book Synopsis Fan Noise Source Diagnostic Test by : National Aeronautics and Space Administration (NASA)
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 2018-06-19 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation is part of a test series that was extremely comprehensive and included aerodynamic and acoustic testing of a fan stage using two different fan rotors and three different stator designs. The test series is known as the Source Diagnostic Test (SDT) and was conducted by NASA Glenn as part of the Advanced Subsonic Technology (AST) Noise Reduction Program. Tone mode measurements of one of the rotors with three different stators were made. The stator designs involve changes in vane count and sweep at constant solidity. The results of both inlet and exhaust tone mode measurements are presented in terms of mode power for both circumferential and radial mode orders. The results show benefits of vane sweep to be large, up to 13 dB in total tone power. At many conditions, the increase in power due to cutting on the rotor/stator interaction is more than offset by vane sweep. The rotor locked mode is shown as an important contributor to tone power when the blade tip speed is near and above Mach one. This is most evident in the inlet when the direct rotor field starts to cut on. Heidelberg, Laurence J. Glenn Research Center NASA/TM-2002-211594, NAS 1.15:211594, E-13378, AIAA Paper 2002-2428
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722156800 Total Pages :54 pages Book Rating :4.1/5 (568 download)
Book Synopsis Active Control of Fan Noise by : National Aeronautics and Space Administration (NASA)
Download or read book Active Control of Fan Noise written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the Active Noise Cancellation (ANC) System designed by General Electric and tested in the NASA Lewis Research Center's (LERC) 48 inch Active Noise Control Fan (ANCF). The goal of this study is to assess the feasibility of using wall mounted secondary acoustic sources and sensors within the duct of a high bypass turbofan aircraft engine for global active noise cancellation of fan tones. The GE ANC system is based on a modal control approach. A known acoustic mode propagating in the fan duct is canceled using an array of flush-mounted compact sound sources. The canceling modal signal is generated by a modal controller. Inputs to the controller are signals from a shaft encoder and from a microphone array which senses the residual acoustic mode in the duct. The key results are that the (6,0) was completely eliminated at the 920 Hz design frequency and substantially reduced elsewhere. The total tone power was reduced 6.8 dB (out of a possible 9.8 dB). Farfield reductions of 15 dB (SPL) were obtained. The (4,0) and (4,1) modes were reduced simultaneously yielding a 15 dB PWL decrease. The results indicate that global attenuation of PWL at the target frequency was obtained in the aft quadrant using an ANC actuator and sensor system totally contained within the duct. The quality of the results depended on precise mode generation. High spillover into spurious modes generated by the ANC actuator array caused less than optimum levels of PWL reduction. The variation in spillover is believed to be due to calibration procedure, but must be confirmed in subsequent tests. Pla, Frederic G. and Hu, Ziqiang and Sutliff, Daniel L. Glenn Research Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722229399 Total Pages :38 pages Book Rating :4.2/5 (293 download)
Book Synopsis Fan Noise Prediction Assessment by : National Aeronautics and Space Administration (NASA)
Download or read book Fan Noise Prediction Assessment written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-03 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is an evaluation of two techniques for predicting the fan noise radiation from engine nacelles. The first is a relatively computational intensive finite element technique. The code is named ARC, an abbreviation of Acoustic Radiation Code, and was developed by Eversman. This is actually a suite of software that first generates a grid around the nacelle, then solves for the potential flowfield, and finally solves the acoustic radiation problem. The second approach is an analytical technique requiring minimal computational effort. This is termed the cutoff ratio technique and was developed by Rice. Details of the duct geometry, such as the hub-to-tip ratio and Mach number of the flow in the duct, and modal content of the duct noise are required for proper prediction. Bent, Paul H. Unspecified Center NAS1-20103; RTOP 538-03-11-01...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721777457 Total Pages :34 pages Book Rating :4.7/5 (774 download)
Book Synopsis Flow Measurements and Multiple Pure Tone Noise from a Forward Swept Fan by : National Aeronautics and Space Administration (NASA)
Download or read book Flow Measurements and Multiple Pure Tone Noise from a Forward Swept Fan written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 34 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-dB reduction in the Effective Perceived Noise Level 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. Laser Doppler Velocimetry (LDV) and shroud unsteady pressure measurement data were obtained upstream of the QHSF and baseline rotors to improve the understanding of the shocks which propagate upstream of the two fans when they are operated at high speeds. The flow phenomena that produce multiple pure tone noise is discussed and compared to measurements of the fan acoustic inlet modes and the far field noise signature of the fan. Weir, Donald S. and Podboy, Gary G. Glenn Research Center NASA/TM-2005-213413, AIAA Paper 2005-1200, E-14931
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)
Book Synopsis Design of a Low Speed Fan Stage for Noise Suppression by : National Aeronautics and Space Administration (NASA)
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...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723178085 Total Pages :156 pages Book Rating :4.1/5 (78 download)
Book Synopsis Improved Nasa-Anopp Noise Prediction Computer Code for Advanced Subsonic Propulsion Systems by : National Aeronautics and Space Administration (NASA)
Download or read book Improved Nasa-Anopp Noise Prediction Computer Code for Advanced Subsonic Propulsion Systems written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experience using ANOPP to predict turbofan engine flyover noise suggests that it over-predicts overall EPNL by a significant amount. An improvement in this prediction method is desired for system optimization and assessment studies of advanced UHB engines. An assessment of the ANOPP fan inlet, fan exhaust, jet, combustor, and turbine noise prediction methods is made using static engine component noise data from the CF6-8OC2, E(3), and QCSEE turbofan engines. It is shown that the ANOPP prediction results are generally higher than the measured GE data, and that the inlet noise prediction method (Heidmann method) is the most significant source of this overprediction. Fan noise spectral comparisons show that improvements to the fan tone, broadband, and combination tone noise models are required to yield results that more closely simulate the GE data. Suggested changes that yield improved fan noise predictions but preserve the Heidmann model structure are identified and described. These changes are based on the sets of engine data mentioned, as well as some CFM56 engine data that was used to expand the combination tone noise database. It should be noted that the recommended changes are based on an analysis of engines that are limited to single stage fans with design tip relative Mach numbers greater than one. Kontos, K. B. and Janardan, B. A. and Gliebe, P. R. Glenn Research Center NOISE PREDICTION; TURBOFAN ENGINES; ENGINE NOISE; SUBSONIC FLOW; COMPUTER PROGRAMS; NOISE SPECTRA; AIRCRAFT NOISE; PREDICTION ANALYSIS TECHNIQUES; ENGINE INLETS; GAS JETS; BLADE TIPS; MACH NUMBER; COMBUSTION CHAMBERS...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722932886 Total Pages :186 pages Book Rating :4.9/5 (328 download)
Book Synopsis Aircraft Noise Prediction Program (Anopp) Fan Noise Prediction for Small Engines by : National Aeronautics and Space Administration (NASA)
Download or read book Aircraft Noise Prediction Program (Anopp) Fan Noise Prediction for Small Engines 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 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Fan Noise Module of ANOPP is used to predict the broadband noise and pure tones for axial flow compressors or fans. The module, based on the method developed by M. F. Heidmann, uses empirical functions to predict fan noise spectra as a function of frequency and polar directivity. Previous studies have determined the need to modify the module to better correlate measurements of fan noise from engines in the 3000- to 6000-pound thrust class. Additional measurements made by AlliedSignal have confirmed the need to revise the ANOPP fan noise method for smaller engines. This report describes the revisions to the fan noise method which have been verified with measured data from three separate AlliedSignal fan engines. Comparisons of the revised prediction show a significant improvement in overall and spectral noise predictions. Hough, Joe W. and Weir, Donald S. Langley Research Center NOISE PREDICTION (AIRCRAFT); JET ENGINES; NOISE SPECTRA; NOISE REDUCTION; AERODYNAMIC NOISE; DATA ACQUISITION; TURBOFANS...
