ROSAS Final Meeting ROSAS. Eric MAURY AIRBUS Engineering Future Projects. Main Achievements. 3rd March Presented by

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1 ROSAS 3rd March 2005 Presented by Eric MAURY AIRBUS Engineering Future Projects ROSAS Final Meeting Main Achievements ROSAS Final Meeting: Overview of achievements

2 WP1 Definition of Silent Aircraft concepts (1/2) Innovative design process toward noise reduction Main driver Noise-shielding efficiency Handling qualities (stability) RFN / OWN Configuration Thermal interaction with empennage / wing Engine installation aerodynamic efficiency Engine installation structure OWN & RFN configurations defined including reference engine and nacelle ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 2

3 WP1 Definition of Silent Aircraft concepts (2/2) Engine definition including acoustic data base Thrust Class (0/0,25/ISA+15K Thrust*1,275) 44,2k Architecture Fan 85.5 in Exhaust SDSF Cruise 35kft/0.8/ISA/0hp/No Air/0.998 intake BPR 10 Impact of new engine installation analysed (preliminary) ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 3

4 WP2 Aerodynamic Investigations (1/2) CAD Model shape design & identification of critical phenomena ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 4

5 WP2 Aerodynamic Investigations (2/2) Initial RFN configuration shows 25% drag increase, small flow separation Initial OWN configuration shows 90% drag increase, strong flow separation Redesign was successful for RFN No acceptable OWN redesign possible Low speed: - RFN does not show critical effects - OWN again shows strong flow separation ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 5

6 WP3 Acoustic characterization (1/3) Successful WTT campaign performed in ONERA CEPRA 19 facility (Jet and Fan noise ) Unique experimental data base now available in Europe on installation/shielding effect of engine noise sources by airframe surface Results started to be exploited and used to derive noise reduction potential for RFN & OWN platform as proposed in ROSAS ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 6

7 WP3 Acoustic characterization (2/3) Turbulent jet noise prediction based on Ffowcs Williams and Hawkings analogy (NLR) Acoustic sources distribution ( two-point correlations) scaled in using RANS data (WP2 provided - ENFLOW). Assessment of flow inhomogeneities effect on installed engine noise (DLR) Application of an existing CAA code (PIANO) on numerical simulation of inviscid perturbations of a pre-computed RANS mean flow (WP2 provided). Fuselage, wing and empennage shielding effects assessment using BEM (ONERA) Extension towards the high frequency (1 st BPF) of an improved method (BEMUSE) comparison with analytical methods (task 3.2). RAIN (CEPRA19), Vj = 235 m/s ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 7 SPL [db] Spectrum at f [Hz] Shielding clean & HL airfoil, direct scattering

8 WP3 Acoustic characterization (3/3) RR Wave theory Semi-empirical ray theory method AI-F (semi-empirical methods) Shielding by lifting surfaces Shielding by cylinders Z A Microphone X Shadow zone Point source Observer in far field TCD (Modelling&Numerical methods) full field Wave Envelope Method (2D flyover simulations, 3D empennage iterative) Boundary Integral Method (3D Iterative) Jet Source Modelling (Equivalent source ) IST (Theoretical methods) 3 Methods : Fresnel Theory 2D and 3D, Simultaneous shielding and reflection TCD, IST and DLR methods well benchmarked ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 8

9 WP4 Assessment of Silent Aircraft(1/3) Preliminary assessment of RFN & OWN aircraft performances (not optimised aircraft!) with weight, Aero and handling qualities estimates vs.rfn UWN RFN OWN is aerodynamically challenging; RFN is less but weight needs to be carefully addressed ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 9

10 WP4 Assessment of Silent Aircraft(2/3) Noise reduction potential OWN concept acoustic reductions are limited due to aircraft performance issues 3.5 EPNdB cumulative reduction, average of RR, SN and A-F results 7.8EPNdB maximum reduction RFN shows similar shielding to OWN and similar aircraft performance to UWN leading to the largest noise reductions 6 EPNdB cumulative reduction, average of RR, SN and AI-F results 9.7 EPNdB maximum reduction RFN has opportunities for further significant acoustic optimisation fuselage and empennage shaping wing positioning matching of shielding surfaces to source directivities reduced airframe noise engine noise source balance ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 10

11 WP4 Assessment of Silent Aircraft(3/3) Recommendations for further investigations Shielding of engine noise sources using airframe is a possible efficient option to reduce aircraft noise (between up to 7 EPNdB reduction) Supportive ROSAS platform i.e. OWN & RFN concepts have similar noise reduction potential (with advantage to RFN) However, preliminary performance assessment shows more potential for the RFN concept than the OWN A number of issues related to the RFN concept (detailed acoustic installation effect, aerodynamics performance, maintainability,..) need to be addressed to get a fair overall aircraft balance This is proposed within the NACRE FP6 project NACRE ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 11

12 Thank you! ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 12

13 Ce document et son contenu sont la propriété d AIRBUS FRANCE S.A.S. Aucun droit de propriété intellectuelle n est accordé par la communication du présent document ou son contenu. Ce document ne doit pas être reproduit ou communiqué à un tiers sans l autorisation expresse et écrite d AIRBUS FRANCE S.A.S. Ce document et son contenu ne doivent pas être utilisés à d autres fins que celles qui sont autorisées. Les déclarations faites dans ce document ne constituent pas une offre commerciale. Elles sont basées sur les postulats indiqués et sont exprimées de bonne foi. Si les motifs de ces déclarations n étaient pas démontrés, AIRBUS FRANCE S.A.S serait prêt à en expliquer les fondements. ROSAS Final Meeting: Overview of achievements 3rd March 2005 Page 13

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