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GEAE’s Expectations for the NASA QAT Program

GE Aircraft Engines. GEAE’s Expectations for the NASA QAT Program. GEAE’s follow-up to the QAT workshop in Dallas 11-12 April ,2000. The next 8 charts were presented by Phil Gliebe at QAT Dallas. GE Expectations for the NASA Quiet Aircraft Technology Program .

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GEAE’s Expectations for the NASA QAT Program

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  1. GE Aircraft Engines GEAE’s Expectations for the NASA QAT Program GEAE’s follow-up to the QAT workshop in Dallas 11-12 April ,2000

  2. The next 8 charts were presented by Phil Gliebe at QAT Dallas GE Expectations for the NASA Quiet Aircraft Technology Program Philip GliebeGE Aircraft EnginesNASA QAT WorkshopDallas, TX April 11, 2000

  3. 65% Reduction in85 dBA Contour Area 2 1 1997 Technology 0 GE Goal -1 -2 Sideline Distance, km -1 0 1 2 3 4 Distance From Brake Release, km GE Views on Acoustics Technology Goals London Airport Criteria 105 - 1997 Technology - GE Goal 100 95 Minimal EPNL Sleep (dB) Disturbance 90 QC 0.5 85 80 Sideline Cutback Approach Goals Below Minimal Sleep-disturbance Levels

  4. Aircraft Noise Level Goals Should be Compatible With Competing Background Noise Levels - 65 to 75 dBA or 80 to 90 EPNdB

  5. Sleep Disturbance (London Airports), Background Sources Important • Engine & Airframe Noise Reduction Required

  6. Acoustics Technology Current State-of-the-Art Normalized EPNL Trends 100 GE90 CF6 95 CMF56 CF34 1997 Technology Regression Upper 85% CI 90 Lower 85% CI 85 Normalized EPNL, dB 80 75 Sideline GEAE 70 Goals Cutback 65 Approach 60 0 200 400 600 800 1000 1200 1400 Specific Thrust (Vmix), ft/sec 10 to 15 dB Challenge Relative to 1997 Technology Noise Levels

  7. ADVANCED ENGINE ACOUSTICS TECHNOLOGY ARCHITECTURE CONSTRAINTS • Specific Thrust - If Too High, Jet Noise Controls, and Jet Noise is Hard to Reduce • Fan Tip Speed - If Too High, I.e., Transonic or Supersonic, Rotor Alone Noise Controls, Reduces Effectiveness of Other Source Reductions (Swept/Leaned Vanes, etc.) Technology Challenge: Aggressive Specific Thrust and Fan Tip Speed - Requires Innovative, Physics-Based Jet Noise and Fan Noise Reductions

  8. ADVANCED ENGINE ACOUSTICS TECHNOLOGY POTENTIAL NOISE REDUCTION CONCEPTS • Balanced Cycle: Lower Jet Noise To Point Where Low-Cost, Low-Penalty Reduction Methods (e.g., Advanced Chevrons) Make Jet Noise Insignificant Contributor • Innovative Fan Noise Reduction:- Fan Rotor Wake Mixing Control- Hybrid Active/Passive Liners- Exhaust Duct Shaping- Low Vane-Count, Swept OGV’s- Swept Fans- Zoned-Impedance Liners- Two-Stage, Low Tip-Speed Fan

  9. GE Expectations for Proposed NASA “Quiet Aircraft Technology Development Program” Significant Engine Noise Source Technology Content- Physics-based research and modeling of noise mechanisms- Exploration of noise mechanisms reduction (not just propulsion/airframe architectures which are quieter) A Balanced Approach- Develop technologies compatible with lower emissions technologies- Develop technologies compatible with airline customer value Set consistent goals- Consistent with envisioned program resources- Consistent with reasonable probability of success in 5 years- Define success in terms of outcomes that industry can use and airline customers can afford.

  10. GEAE QAT Expectations: After attending the Dallas W/S Portfolio Diversity/Work splits: • Revolutionary concepts for Far Term - 10% of funding • New configurations, cycles, etc • Revolutionary concepts for Mid term - 40% of funding • Engines and Aircraft entering service in 2007-2020 • Revolutionary Concepts for Current and near term - 50% of funding • Address technical barriers to meet current and near term noise regulations. Funding/Work splits necessary to meet noise goals and obtain Cost Sharing

  11. GEAE QAT Expectations Work Focus Area Funding Splits: • Low Noise Operations -- 10% of funding • Engines Systems --- 30% of funding • Modeling and Integration-- 30% of funding • Airframe Systems ---- 30 % of funding

  12. GEAE QAT Expectations QAT Structure: • Follow the AST Noise format plus: • Steering committee with academia and UEET • Technical committee all parties plus UEET and Military • International interface committee ( NASA and US Industry plus European Union and European Industry)

  13. GEAE QAT Expectations Goals: • GEAE believes that the NASA pillar goals for Noise need clarification • GEAE interprets the NASA 3-Pillar Goals for Noise - reducing perceived noise by a factor of two in 10 years and by a factor of 4 in 20 (or 25) years - to mean 3 dB reduction and 6 dB reduction, from a 1997 base ( GE90 ) • GEAE does not interpret the NASA Pillar Goals to be based on factors of 2 and 4 reduction in “Total Perceived Noisiness” or “Total Loudness” in units of “noys” - it is assumed to be based on the effective acoustic power per event corresponding to EPNL [ WEPNL = 10(EPNL/10) ] • GEAE supports setting a absolute stretch-goal of 85 EPNdB or a 10 dB-down goal for the first five year QAT program with the understanding that the 85 EPNdB or 10 dB-down goal will not be achieved until the 2007 to 2010 time period, and therefore requires a funded follow-on 2nd five year QAT program

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