Optimization of Bypass Outlet Guide Vane for Low Interaction Noise

An optimization approach has been developed and applied to a fan stage representative of a modern turbofan engine to achieve novel, realistic, low-interaction-tone noise bypass outlet guide vanes with acceptable mechanical and aerodynamic properties. The incorporation of axial sweep in the design of the bypass stators is used as a passive method to achieve sizeable reductions in the discrete frequency tones generated by the impingement of the fan wakes. The acoustic benefits, mechanical properties, and aerodynamic performance of an unconventional sweep profile of the stator leading edge have been investigated numerically in an optimization framework using a combination of computational fluid dynamics and finite-element methods to solve each part of the problem. The results obtained in two separate optimizations to reduce interaction noise at the noise-critical sideline operating condition are presented and analyzed.

[1]  Nicholas A. Cumpsty,et al.  The Use of Sweep and Dihedral in Multistage Axial Flow Compressor Blading—Part I: University Research and Methods Development , 2002 .

[2]  Liping Xu,et al.  Comparison Between Postprocessing Methods Applied to Rotor-Stator-Interaction Tone-Noise Problems , 2011 .

[3]  M. Giles,et al.  Effects of Flow Instabilities on the Linear Analysis of Turbomachinery Aeroelasticity , 2003 .

[4]  Pierre Moinier,et al.  Eigenmode Analysis for Turbomachinery Applications , 2005 .

[5]  Dennis L. Huff.  Noise Reduction Technologies for Turbofan Engines , 2007 .

[6]  C. M. Shieh,et al.  Linearized Navier-Stokes Analysis for Rotor-Stator Interaction Tone Noise Prediction , 2010 .

[7]  R. P. Johnston,et al.  Energy efficient engine: Preliminary design and integration studies , 1978 .

[8]  Nigel Peake,et al.  Analytically-based Approach to Rotor-stator Interaction Noise in Mean Swirling Flow , 2004 .

[9]  M. Arakawa,et al.  Development of Adaptive Real Range(ARRange)Genetic Algorithms , 1998 .

[10]  D. Sasaki,et al.  Multi-objective optimization for aerodynamic designs by using ARMOGAs , 2004, Proceedings. Seventh International Conference on High Performance Computing and Grid in Asia Pacific Region, 2004..

[11]  Richard P. Woodward,et al.  Acoustic Benefits of Stator Sweep and Lean for a High Tip Speed Fan , 2002 .

[12]  Farrokh Mistree,et al.  Simulation reduction using the Taguchi method , 1993 .

[13]  M. Sergio Campobasso,et al.  Adjoint Calculation of Sensitivities of Turbomachinery Objective Functions , 2003 .

[14]  Edmane Envia,et al.  Fan Noise Reduction: An Overview , 2002 .

[15]  M. Giles,et al.  Three-Dimensional Nonreflecting Boundary Conditions for Swirling Flow in Turbomachinery , 2007 .

[16]  O. V. Atassi.  Computing the sound power in non-uniform flow , 2003 .

[17]  Pieter Sijtsma,et al.  Noise Validation of Model Fan Rig with Engine , 2006 .

[18]  Richard P. Woodward,et al.  Benefits of Swept-and-Leaned Stators for Fan Noise Reduction , 2001 .

[19]  M. Nallasamy,et al.  Design Selection and Analysis of a Swept and Leaned Stator Concept , 1999 .

[20]  Nick Humphreys,et al.  Multi-Disciplinary Optimisation of a Transonic Fan for Low Tone Noise , 2011 .

[21]  Alexander G. Wilson.  Application of CFD to wake/aerofoil interaction noise - A flat plate validation case , 2001 .

[22]  John D. Denton,et al.  The exploitation of three-dimensional flow in turbomachinery design , 1998 .

[23]  John Jude Bolger.  Three dimensional design of compressor blades , 1999 .

[24]  Leigh Lapworth,et al.  PADRAM: Parametric Design and Rapid Meshing System for Turbomachinery Optimisation , 2003 .