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Report to CAEP by the CAEP Noise Technology Independent Expert Panel. Aircraft Noise Technology Review and Medium and Long Term Noise Reduction Goals. Report (English-only publication)
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Page 1 of 106 ICAO COMMITTEE ON AVIATION ENVIRONMENTAL PROTECTION Report to CAEP by the CAEP Noise Technology Independent Expert Panel Revised March 2010 Aircraft Noise Technology Review and Medium and Long Term Noise Reduction Goals Authors Philip R. Gliebe US Jean Beslon France Wajid Chishty Canada Dennis L. Huff US Hirokazu Ishii Japan Yuri Khaletskiy Russia Brian J. Tester UK
Page 2 of 106 Table of Contents Table of Contents ........................................................................................................... 2 1. Executive Summary ................................................................................................... 4 1.1 Introduction .............................................................................................................. 4 1.2 Background ...................................................................................................... 5 1.3 Remit ................................................................................................................ 5 1.4 Aircraft Category Selection and Considerations.............................................. 6 1.5 Selection of Reference Aircraft ....................................................................... 7 1.6 Pilot Studies ..................................................................................................... 8 1.7 Conclusions Recommendations ................................................................... 8 1.7.1 Mid Term Year 2018 ................................................................................. 9 1.7.2 Long Term Year 2028 .............................................................................. 12 1.7.3 Noise Reduction Benefit Goal Uncertainty ................................................ 12 1.7.4 Final Noise Reduction Goal Recommendations Summary ........................ 13 1.7.5 Noise Abatement Operational Procedures Goal Benefits ........................... 15 2. Introduction .............................................................................................................. 19 2.1 Background .................................................................................................... 19 2.2 Remit .............................................................................................................. 19 2.3 Conduct of the IE Review .............................................................................. 19 2.4 Terms of Reference ........................................................................................ 20 2.5 Additional Guidance ...................................................................................... 20 3. Scope of report ......................................................................................................... 21 3.1 IEP Report Preparation Preliminary Work .................................................... 21 3.2 Goal Metrics................................................................................................... 21 3.3 Component Technology Classification .......................................................... 21 3.4 Noise Reduction Technology Primary Focus ................................................ 21 4. Policy overview ....................................................................................................... 22 5. Research Technology Assessment ....................................................................... 25 5.1 Noise Reduction Technologies Medium Term ............................................... 25 5.1.1 Fan............................................................................................................... 25 5.1.2 Jet ................................................................................................................ 27 5.1.3 Airframe ...................................................................................................... 29 5.1.4 Core ............................................................................................................. 32 5.1.5 Nacelle Liners ......................................................................................... 36 5.2 Noise Reduction Technologies Long Term .................................................... 37 5.2.1 Fan............................................................................................................... 37 5.2.2 Jet ................................................................................................................ 40 5.2.3 Airframe ...................................................................................................... 41 5.2.4 Core ............................................................................................................. 42 5.2.5 Nacelle Liners ......................................................................................... 44 6. Noise reduction prospects ........................................................................................ 45 6.1 Aircraft Category Selection and Engine Bypass Ratio Projections .................. 45 6.2 Pilot Studies ....................................................................................................... 48 6.3 Assessment of noise reduction trends with bypass ratio BPR and Noise Reduction Technology NRT ................................................................................. 56 6.4 Novel Engine Airframe Concepts .................................................................. 61 7. Recommended noise reduction goals ....................................................................... 66 7.1 Mid Term Year 2018 ...................................................................................... 66 7.2 Long Term Year 2028 ..................................................................................... 67
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