Dale Van Zante Andy Breeze-Stringfellow PDF
Preview Dale Van Zante Andy Breeze-Stringfellow
National Aeronautics and Space Administration! T NASA/GE C HE OLLABORATION O R T ON PEN OTOR ESTING Dale Van Zante [email protected] Acoustics Branch NASA Glenn Research Center Cleveland, OH Andy Breeze-Stringfellow [email protected] Principal Engineer GE Aviation Cincinnati, OH Environmentally Responsible Aviation Projec t 1 National Aeronautics and Space Administration! Outline •" Background: Why Open Rotors? •" The Open Rotor test program •" Low speed testing: 9x15 LSWT •" ERA Diagnostics Program •" High speed testing: 8x6 SWT •" Challenges •" Other related activities •" System Studies UDF on B727 Testing is supported by the Environmentally Responsible Aviation Project Data analysis efforts are supported by the Subsonic Fixed Wing Project Environmentally Responsible Aviation Projec t 2 National Aeronautics and Space Administration! Current Ultra-High Bypass Systems GE/CFM Open Rotors P&W Geared Turbofan (GTF) Open Rotors have the potential for game changing fuel burn savings. A challenge will be to make them acoustically acceptable. Environmentally Responsible Aviation Projec t 3 National Aeronautics and Space Administration! Propulsor Technology Roadmap Open Rotor current BPR >30 4 e g a t S Airframe & Propulsion Techs o t UHB (2015 TRL 6) UHB (2013 EIS) m BPR ~ 15-20 BPR ~ 9-12 u C B Airframe Techs N+1 d N Goal UHB + NASA NR Techs P E (2015 TRL6) BPR ~ 15-20 E Airframe Shielding N+2 S I Goal Airframe & Propulsion Techs O N BASE %! FUEL BURN Environmentally Responsible Aviation Projec t 4 National Aeronautics and Space Administration! What is different than the early 1990’s? Baseline Tip vortex Improved State of the art CFD being used to modify the open rotor tip vortex at take-off conditions to reduce the noise generated. Environmentally Responsible Aviation Projec t 5 National Aeronautics and Space Administration! The NASA/GE Collaboration on Open Rotor Testing •" Objective: Explore the design space for lower noise while maintaining the high propulsive efficiency from a counter-rotating open rotor system. •" Approach: 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 and fuselage integration. Historical Baseline Blade Set 12 x 10 blade count Non-proprietary Environmentally Responsible Aviation Projec t 6 National Aeronautics and Space Administration! Test Program Overview 8x6 High Speed 9x15 Low Speed Wind Tunnel Wind Tunnel Takeoff and Approach ERA Diagnostics Cruise Conditions Conditions •"Aerodynamic •"Acoustic phased •"Aerodynamic performance array performance •"Acoustics •"Farfield Acoustics •"Near field unsteady •"Hot Film flowfield with Pylon pressure measurements •"Pressure Sensitive Paint •"Stereo Particle Image Velocimetry Environmentally Responsible Aviation Projec t 7 National Aeronautics and Space Administration! 9x15 Low Speed Wind Tunnel Test Setup Open Rotor Propulsion Rig (ORPR) Environmentally Responsible Aviation Projec t 8 National Aeronautics and Space Administration! 9x15 Low Speed Wind Tunnel Test Setup Linear array at 60” sideline 16 directivity angles Traversing microphone at 60” sideline 18 directivity angles Environmentally Responsible Aviation Projec t 9 National Aeronautics and Space Administration! 9x15 Low Speed Wind Tunnel Results to Date Aerodynamic and acoustic performance testing for Approach and Takeoff set points in an isolated configuration. Aerodynamic performance: -" rotating thrust/torque balance measurements through digital telemetry -" fore/afterbody and rotor cavity pressures for effective thrust Acoustics: -" traversing microphone - linear array The Low Speed testing was completed May 14. Data is being analyzed now. Environmentally Responsible Aviation Projec t 10
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