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There are a total of 21 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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New Fan Engine Noise-Reduction Concept Using Trailing Edge Blowing of Fan Blades Demonstrated
Author(s): Heidelberg, Laurence J.
Abstract: A major source of noise in commercial turbofan engines is the interaction of the fan blade wakes with the fan exit vanes (stators). These wakes can be greatly reduced by filling them with air blown out of the blade trailing ...
NASA Center: Glenn Research Center
Publication Year: 2002
Added to NTRS: 2008-06-02
Document ID: 20050202083
Active Noise Control of Low Speed Fan Rotor-Stator Modes
Author(s): Sutliff, Daniel L.; Hu, Ziqiang; Pla, Frederic G.; Heidelberg, Laurence J.
Abstract: This report describes the Active Noise Cancellation System designed by General Electric and tested in the NASA Lewis Research Center's 48 inch Active Noise Control Fan. The goal of this study was to assess the feasibility of ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2005-08-25
Accession Number: 97N19805; Document ID: 19970017613; Report Number: AIAA Paper 97-1641, E-10744, NAS 1.15:107458, NASA-TM-107458
Advanced turboprop wing installation effects measured by unsteady blade pressure and noise
Author(s): Heidelberg, Laurence J.; Woodward, Richard P.
Abstract: A single rotation model propeller (SR-7A) was tested at simulated takeoff/approach conditions (Mach 0.2), in the NASA Lewis 9- by 15-Ft Anechoic Wind Tunnel. Both unsteady blade surface pressures and noise measurements were ...
NASA Center: Glenn Research Center
Publication Year: 1987
Added to NTRS: 2005-08-25
Accession Number: 88N10008; Document ID: 19880000626; Report Number: AIAA PAPER 87-2719, E-3737, NAS 1.15:100200, NASA-TM-100200
Comparison of Tone Mode Measurements for a Forward Swept and Baseline Rotor Fan
Author(s): Heidelberg, Laurence J.
Abstract: A forward swept fan, designated the Quite 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 ...
NASA Center: Glenn Research Center
Publication Year: 2003
Added to NTRS: 2005-08-25
Document ID: 20030063234; Report Number: AIAA Paper 2003-3293, E-13953, NAS 1.15:212378, NASA/TM-2003-212378
Baseline acoustic levels of the NASA Active Noise Control Fan rig
Author(s): Sutliff, Daniel L.; Heidelberg, Laurence J.; Elliott, David M.; Nallasamy, M.
Abstract: Extensive measurements of the spinning acoustic mode structure in the NASA 48 inch Active Noise Control Fan (ANCF) test rig have been taken. A continuously rotating microphone rake system with a least-squares data reduction ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2005-08-25
Accession Number: 96N28545; Document ID: 19960027050; Report Number: AIAA Paper 96-1745, E-10231, NAS 1.26:107214, NASA-TM-107214
Azimuthal Directivity of Fan Tones Containing Multiple Modes
Author(s): Heidelberg, Laurence J.; Sutliff, Daniel L.; Nallasamy, M.
Abstract: The directivity of fan tone noise is generally measured and plotted in the sideline or flyover plane and it is assumed that this curve is the same for all azimuthal angles. When two or more circumferential (m-order) modes of ...
NASA Center: Glenn Research Center
Publication Year: 1997
Added to NTRS: 2005-08-25
Accession Number: 97N25397; Document ID: 19970026029; Report Number: AIAA Paper 97-1587, E-10750, NAS 1.15:107464, NASA-TM-107464
Unsteady blade pressure measurements on a model counterrotation propeller
Author(s): Heidelberg, Laurence J.; Woodward, Richard P.
Abstract: In an exploratory effort an advanced counterrotation propeller instrumented with blade-mounted pressure transducers was tested in the NASA Lewis 9- by 15-Foot Anechoic Wind Tunnel at a simulated takeoff and landing speed of ...
NASA Center: Glenn Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N20779; Document ID: 19890011408; Report Number: AIAA PAPER 89-1144, E-4684, NAS 1.15:102002, NASA-TM-102002
Far-field noise and internal modes from a ducted propeller at simulated aircraft takeoff conditions
Author(s): Woodward, Richard P.; Bock, Lawrence A.; Heidelberg, Laurence J.; Hall, David G.
Abstract: The ducted propeller offers structural and acoustic benefits typical of conventional turbofan engines while retaining much of the aeroacoustic benefits of the unducted propeller. A model Advanced Ducted Propeller (ADP) was ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N16702; Document ID: 19920007484; Report Number: AIAA PAPER 92-0371, E-6747, NAS 1.15:105369, NASA-TM-105369
Coupling of Low Speed Fan Stator Vane Unsteady Pressures to Duct Modes: Measured versus Predicted
Author(s): Sutliff, Daniel L.; Heidelberg, Laurence J.; Envia, Edmane
Abstract: Uniform-flow annular-duct Green's functions are the essential elements of the classical acoustic analogy approach to the problem of computing the noise generated by rotor-stator interaction inside the fan duct. This paper ...
NASA Center: Glenn Research Center
Publication Year: 1999
Added to NTRS: 2005-08-25
Document ID: 19990047264; Report Number: AIAA Paper 99-1864, E-11583, NAS 1.15:209050, NASA/TM-1999-209050
Fan Noise Source Diagnostic Test: Tone Modal Structure Results
Author(s): Heidelberg, Laurence J.
Abstract: 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 ...
NASA Center: Glenn Research Center
Publication Year: 2002
Added to NTRS: 2005-08-25
Document ID: 20020082941; Report Number: AIAA Paper 2002-2428, E-13378, NAS 1.15:211594, NASA/TM-2002-211594
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