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  • 1
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    Effect of AFT Rotor on the Inter-Rotor Flow of an Open Rotor Propulsion System (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of the aft rotor on the inter-rotor flow field of an open rotor propulsion rig were examined. A Particle Image Velocimetry (PIV) dataset that was acquired phase locked to the front rotor position has been phase averaged based on the relative phase angle between the forward and aft rotors. The aft rotor phase was determined by feature tracking in raw PIV images through an image processing algorithm. The effect of the aft rotor potential field on the inter-rotor flow were analyzed and shown to be in good agreement with Computational Fluid Dynamics (CFD) simulations. It was shown that the aft rotor had no substantial effect on the position of the forward rotor tip vortex but did have a small effect on the circulation strength of the vortex when the rotors were highly loaded.
    Keywords: Fluid Mechanics and Thermodynamics; Aircraft Propulsion and Power
    Type: GT2016-56392 , GRC-E-DAA-TN28382 , ASME/Turbo Expo 2016; Jun 13, 2016 - Jun 17, 2016; Seoul; Korea, Republic of
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Environmentally Responsible Aviation: Propulsion Research to Enable Fuel Burn, Noise and Emissions Reduction (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The NASA Environmentally Responsible Aviation (ERA) program is maturing technologies to enable simultaneous reduction of fuel burn, noise and emissions from an aircraft engine system. Three engine related Integrated Technology Demonstrations (ITDs) have been completed at Glenn Research Center in collaboration with Pratt Whitney, General Electric and the Federal Aviation Administration. The engine technologies being matured are: a low NOx, fuel flexible combustor in partnership with Pratt Whitney; an ultra-high bypass, ducted propulsor system in partnership with Pratt Whitney and FAA; and high pressure ratio, front-stage core compressor technology in partnership with General Electric. The technical rationale, test configurations and overall results from the test series in each ITD are described. ERA is using system analysis to project the benefits of the ITD technologies on potential aircraft systems in the 2025 timeframe. Data from the ITD experiments were used to guide the system analysis assumptions. Results from the current assessments for fuel burn, noise and oxides of nitrogen emissions are presented.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN27429 , International Symposium on Air Breathing Engines (ISABE 2015); Oct 25, 2015 - Oct 30, 2015; Phoenix, AZ; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Tip Vortex and Wake Characteristics of a Counterrotating Open Rotor (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: One of the primary noise sources for Open Rotor systems is the interaction of the forward rotor tip vortex and blade wake with the aft rotor. NASA has collaborated with General Electric on the testing of a new generation of low noise, counterrotating Open Rotor systems. Three-dimensional particle image velocimetry measurements were acquired in the intra-rotor gap of the Historical Baseline blade set. The velocity measurements are of sufficient resolution to characterize the tip vortex size and trajectory as well as the rotor wake decay and turbulence character. The tip clearance vortex trajectory is compared to results from previously developed models. Forward rotor wake velocity profiles are shown. Results are presented in a form as to assist numerical modeling of Open Rotor system aerodynamics and acoustics.
    Keywords: Aerodynamics
    Type: E-18418-1 , 48th AIAA Joint Propulsion Conference; Jul 30, 2012 - Aug 01, 2012; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Propulsion Noise Reduction Research in the NASA Advanced Air Transport Technology Project (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Aircraft Noise Reduction (ANR) sub-project is focused on the generation, development, and testing of component noise reduction technologies progressing toward the NASA far term noise goals while providing associated near and mid-term benefits. The ANR sub-project has efforts in airframe noise reduction, propulsion (including fan and core) noise reduction, acoustic liner technology, and propulsion airframe aeroacoustics for candidate conventional and unconventional aircraft configurations. The current suite of propulsion specific noise research areas is reviewed along with emerging facility and measurement capabilities. In the longer term, the changes in engine and aircraft configuration will influence the suite of technologies necessary to reduce noise in next generation systems.
    Keywords: Acoustics
    Type: GRC-E-DAA-TN43850 , International Society of Air Breathing Engines (ISABE 2017); Sep 03, 2017 - Sep 08, 2017; Manchester, England; United Kingdom
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Acoustic Considerations for PAI (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Noise is an aircraft system level issue. The propulsion system noise is influenced by the local aerodynamic environment. The presence of aircraft structures near the propulsion system will impact the noise produced. Ergo, propulsion airframe integration will have significant influence on the acoustics of the final aircraft system design. The presentation is an overview of propulsion and airframe acoustics issues that are impacted by the propulsion airframe integration.
    Keywords: Aircraft Design, Testing and Performance; Acoustics
    Type: GRC-E-DAA-TN56935 , Propulsion-Airframe Integration Technical Interchange Meeting (PAI-TIM); May 30, 2018 - May 31, 2018; Cleveland, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Aircraft Noise Reduction Subproject Overview (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The material presents highlights of propulsion and airframe noise research being completed for the Advanced Air Transport Technology Project. The basis of noise reduction plans along with representative work for the airframe, propulsion, and propulsion-airframe integration is discussed for the Aircraft Noise reduction Subproject.
    Keywords: Acoustics; Aircraft Design, Testing and Performance
    Type: GRC-E-DAA-TN31600 , Acoustics Technical Working Group; Apr 19, 2016 - Apr 20, 2016; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Effect of Aft Rotor on the Inter-Rotor Flow of an Open Rotor Propulsion System (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-09
    Description: The effects of the aft rotor on the inter-rotor flow field of an open rotor propulsion rig were examined. A Particle Image Velocimetry (PIV) dataset that was acquired phase locked to the front rotor position has been phase averaged based on the relative phase angle between the forward and aft rotors. The aft rotor phase was determined by feature tracking in raw PIV images through an image processing algorithm. The effects of the aft rotor potential field on the inter-rotor flow were analyzed and shown to be in reasonably good agreement with Computational Fluid Dynamics (CFD) simulations. The aft rotor position was shown to have a significant upstream effect, with implications for front rotor interaction noise. It was found that the aft rotor had no substantial effect on the position of the forward rotor tip vortex but did have a small effect on the circulation strength of the vortex when the rotors were highly loaded.
    Keywords: Acoustics
    Type: GRC-E-DAA-TN53777 , Journal of Engineering for Gas Turbines and Power (ISSN 0742-4795) (e-ISSN 1528-8919); 139; 4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Reestablishing Open Rotor as an Option for Significant Fuel Burn Improvements (2011)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A low-noise open rotor system is being tested in collaboration with General Electric and CFM International, a 50/50 joint company between Snecma and GE. Candidate technologies for lower noise will be investigated as well as installation effects such as pylon integration. Current test status is presented as well as future scheduled testing which includes the FAA/CLEEN test entry. Pre-test predictions show that Open Rotors have the potential for revolutionary fuel burn savings.
    Keywords: Aircraft Propulsion and Power
    Type: E-17663 , HQ-STI-11-013 , AIAA 2010 Aero Sciences Meeting; Jan 04, 2011 - Jan 07, 2011; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Open Rotor Development (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The ERA project executed a comprehensive test program for Open Rotor aerodynamic and acoustic performance. System studies used the data to estimate the fuel burn savings and acoustic margin for an aircraft system with open rotor propulsion. The acoustic measurements were used to produce an auralization that compares the legacy blades to the current generation of open rotor designs.
    Keywords: Aeronautics (General)
    Type: GRC-E-DAA-TN30402 , Green Aviation Technical Interchange Meeting (TIM); Mar 29, 2016; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Progress in Open Rotor Research: A U.S. Perspective (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In response to the 1970s oil crisis, NASA created the Advanced Turboprop Project (ATP) to mature technologies for high-speed propellers to enable large reductions in fuel burn relative to turbofan engines of that era. Both single rotation and contra-rotation concepts were designed and tested in ground based facilities as well as flight. Some novel concepts configurations that were not well publicized at the time, were proposed as part of the effort. The high-speed propeller concepts did provide fuel burn savings, albeit with some acoustics and structural challenges to overcome. When fuel prices fell, the business case for radical new engine configurations collapsed and the research emphasis returned to high bypass ducted configurations. With rising oil prices and increased environmental concerns there is renewed interest in high-speed propeller based engine architectures. Contemporary analysis tools for aerodynamics and aeroacoustics have enabled a new era of blade designs that have both high efficiency and acceptable noise characteristics. A recent series of tests in the U.S. have characterized the aerodynamic performance and noise from these modern contra-rotating propeller designs. Additionally the installation and noise shielding aspects for conventional airframes and blended wing bodies have been studied. Historical estimates of propfan performance have relied on legacy propeller performance and acoustics data. Current system studies make use of the modern propeller data with higher fidelity installation effects data to estimate the performance of a contemporary aircraft system with favorable results. This paper presents the current state of high-speed propeller open rotor research within the U.S. from an overall viewpoint of the various efforts ongoing. The current projections for the technology are presented.
    Keywords: Aerodynamics; Acoustics
    Type: GT2015-42203 , GRC-E-DAA-TN23332 , ASME Turbo Expo 2015; Jun 15, 2015 - Jun 19, 2015; Montreal, Quebec; Canada
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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