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There are a total of 15 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Ultra-high bypass research
Author(s): Miller, Christopher J.; Dittmar, James H.; Jeracki, Robert J.
Abstract: An overview of the ultra-high bypass research at the NASA Lewis Research Center is presented. Over the past decade, the program was focused on unducted rotors and precipitated several development efforts in industry. In this ...
NASA Center: Glenn Research Center
Publication Year: 1991
Added to NTRS: 2008-05-31
Accession Number: 91N20117; Document ID: 19910010804
Comprehensive Report of Fan Performance From Duct Rake Instrumentation on 1.294 Pressure Ratio, 806 ft/sec Tip Speed Turbofan Simulator Models
Author(s): Jeracki, Robert J.
Abstract: A large scale model representative of an advanced ducted propulsor-type, low-noise, very high bypass ratio turbofan engine was tested for acoustics, aerodynamic performance, and off-design operability in the NASA Glenn 9- by ...
NASA Center: Glenn Research Center
Publication Year: 2006
Added to NTRS: 2006-08-02
Document ID: 20060007570; Report Number: E-15233, NASA/TM-2006-213863
Porous wind tunnel corrections for counterrotation propeller testing
Author(s): Stefko, George L.; Jeracki, Robert J.
Abstract: Wind tunnel interference corrections have direct impact on measured propeller efficiency. A systematic series of wind tunnel tests was done in the porous-wall NASA Lewis 8- by 6-Foot Wind Tunnel to determine the wind tunnel ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-10-13
Accession Number: 88N22019; Document ID: 19880012635; Report Number: E-4099, NAS 1.15:100873, NASA-TM-100873
Effect of reduced aft diameter and increased blade number on high-speed counterrotation propeller performance
Author(s): Rose, Gayle E.; Jeracki, Robert J.
Abstract: Performance data of 0.17-scale model counterrotation pusher propeller configurations were taken in the NASA Lewis 8- by 6-Foot Supersonic Wind Tunnel at Mach numbers of 0.66, 0.71, 0.75, and 0.79. These tests investigated ...
NASA Center: Glenn Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 90N13352; Document ID: 19900004036; Report Number: AIAA PAPER 89-0438, E-4837, NAS 1.15:102077, NASA-TM-102077
The Alternative Low Noise Fan
Author(s): Dittmar, James H.; Elliott, David M.; Jeracki, Robert J.; Moore, Royce D.; Parrott, Tony L.
Abstract: A 106 bladed fan with a design takeoff tip speed of 1100 ft/sec was hypothesized as reducing perceived noise because of the shift of the blade passing harmonics to frequencies beyond the perceived noise rating range. A 22 ...
NASA Center: Glenn Research Center, Langley Research Center
Publication Year: 2000
Added to NTRS: 2005-08-25
Document ID: 20010018723; Report Number: E-12153, NAS 1.26:209916, NASA/TM-2000-209916
Model Engine Performance Measurement From Force Balance Instrumentation
Author(s): Jeracki, Robert J.
Abstract: A large scale model representative of a low-noise, high bypass ratio turbofan engine was tested for acoustics and performance in the NASA Lewis 9- by 15-Foot Low-Speed Wind Tunnel. This test was part of NASA's continuing ...
NASA Center: Glenn Research Center
Publication Year: 1998
Added to NTRS: 2005-08-25
Document ID: 19980211443; Report Number: AIAA Paper 98-3112, E-11263, NAS 1.15:208486, NASA/TM-1998-208486
The effect of front-to-rear propeller spacing on the interaction noise at cruise conditions of a model counterrotation propeller having a reduced diameter aft propeller
Author(s): Dittmar, James H.; Gordon, Eliott B.; Jeracki, Robert J.
Abstract: The effect of forward-to-aft propeller spacing on the interaction noise of a counterrotation propeller with reduced aft diameter was measured at cruise conditions. In general, the tones at 100 percent speed decreased from ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 89N10603; Document ID: 19890001232; Report Number: E-4340, NAS 1.15:101329, NASA-TM-101329
Wind-tunnel results of advanced high-speed propellers at takeoff, climb, and landing Mach numbers
Author(s): Stefko, George L.; Jeracki, Robert J.
Abstract: Low-speed wind-tunnel performance tests of two advanced propellers have been completed at the NASA Lewis Research Center as part of the NASA Advanced Turboprop Program. The 62.2 cm (24.5 in.) diameter adjustable-pitch models ...
NASA Center: Glenn Research Center
Publication Year: 1985
Added to NTRS: 2005-08-25
Accession Number: 89N19265; Document ID: 19890009894; Report Number: E-2417, NAS 1.15:87030, NASA-TM-87030
Experimental investigation of the subsonic high-altitude operation of the NASA Lewis 10- by 10-foot supersonic wind tunnel
Author(s): Hughes, Christopher E.; Jeracki, Robert J.
Abstract: An experimental investigation was conducted in the NASA Lewis 10- by 10-Foot Supersonic Wind Tunnel during subsonic tunnel operation in the aerodynamic cycle to determine the test section flow characteristics near the ...
NASA Center: Glenn Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 88N15814; Document ID: 19880006432; Report Number: E-3823, NAS 1.15:100214, NASA-TM-100214
Takeoff/approach noise for a model counterrotation propeller with a forward-swept upstream rotor
Author(s): Woodward, Richard P.; Hall, David G.; Podboy, Gary G.; Jeracki, Robert J.
Abstract: A scale model of a counterrotating propeller with forward-swept blades in the forward rotor and aft-swept blades in the aft rotor (designated F39/A31) has been tested in the NASA Lewis 9- by 15-Foot Anechoic Wind Tunnel. ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 93N16715; Document ID: 19930007526; Report Number: AIAA PAPER 93-0596, E-7479, NAS 1.15:105979, NASA-TM-105979
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