AEROENGINE AEROACOUSTIC INTERACTIONS

Lead Research Organisation: Cranfield University
Department Name: Sch of Aerospace, Transport & Manufact

Abstract

Traditionally both computational and experimental turbomachinery studies explore isolated components. However, the recent Stanford University whole engine simulation, acknowledges that strong component interactions can take place, and that to advance understanding these interactions must be accounted for. This is strong motivation for connecting Savill and Peake's recent EPSRC computational modelling work on the fan and outlet guide vanes to Tucker's recent EPSRC funded simulation work on the jet, through the fan bypass flow. Once connected, we then wish to extend further downstream, ultimately exploring the interaction of the nacelle shear layer and jet with the deployed wing flap of the airframe. The key objective for computer models is to predict engine-airframe-pylon interactions. Here, moving in this direction, we wish to perform ambitious large eddy simulation and analytical studies to predict the fan, outlet guide vane, pylon interaction along with other bypass duct component interactions (a real bypass duct is not a clean geometry with multiple gas path blockages). We then wish to feed this information into the jet nozzle, exploring the scattering of the upstream sound by the jet pipes and the interaction of this with the downstream airframe. The physical insights and models gained should lay foundations for quieter more environmentally friendly aircraft. Notably, the study will endeavour to exploit the traditional triad of measurement, analytical analysis and computation. However, the former will be based on existing data.
 
Description We have demonstrated that advanced engineering computational methods can now be used to capture the noise generation and transmission from the initial fan blades, right through a large jet engine by-pass duct, and out into the exhaust including interaction with a deployed high-lift wing flap. In particular the computer simulations have been shown to capture the various known, and newly identified, noise sources and new mathematical modelling descriptions developed for these. A good comparison with available experimental data has been achieved and the Lattice Boltzmann Method has been shown to provide equivalent results to Navier-Stokes simulations at much reduced computation cost, using the XFlow commercial code.
Exploitation Route The work allows a better understanding of the overall noise generation mechanisms for latest generation very large by-pass ratio aeroengines, and so can help facilitate the introduction of control techniques required to meet 2020 noise emission targets.
It shows that such high-fidelity computational aeroacoustics analysis can now been performed for whole engine configurations and so help minimise propulsion system integration penalties for aircraft operations.
For the future such methods can now be used with some confidence to develop novel aircraft/engine configurations and technologies that will be needed to meet more stringent 2050 emissions targets.
Sectors Aerospace, Defence and Marine,Transport

 
Description To inform Rolls-Royce plc & Airbus Operations Ltd. To complement work of the High Performance Computing Consortium on Computational Aeroacoustics and inform new UK Applied Aerodynamics Consortium; also now to provide input to the UK Consortium on Mesoscale Engineering Science and commercial LBM (XFlow) code provider Nextlimit Dynamics - now part of 3DS (Dassault Systemes).
First Year Of Impact 2008
Sector Aerospace, Defence and Marine,Transport
Impact Types Societal,Economic

 
Description ARCHER Resource Allocation Panel Leadership Project
Amount £150,000 (GBP)
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Public
Country United Kingdom
Start 03/2017 
End 09/2018
 
Title Computational Simulations 
Description Time-series computational flow simulations and restart data - for Navier-Stokes Simulations and/or Lattice Boltzmann Method schemes. 
Type Of Material Database/Collection of data 
Year Produced 2012 
Provided To Others? Yes  
Impact Enabling subsequent analyses and comparative simulations with other computational and mathematical modelling methods to improve academic understanding and prediction methods for industry, as well as verifying, supporting, and extending complementary experimental data taking. 
 
Description Airbus Operations Ltd 
Organisation Airbus Group
Department Airbus Operations
Country United Kingdom 
Sector Private 
PI Contribution Joint EPSRC Project collaboration with our group responsible for more fundamental computational simulation studies against experiment and mathematical formulae.
Collaborator Contribution Technical interactions and advice.
Impact As for Joint Project partners University of Cambridge
Start Year 2010
 
Description Bristol University (Aeroacoustics) 
Organisation University of Bristol
Country United Kingdom 
Sector Academic/University 
PI Contribution Provision of computer simulations and resources for cross-comparison of method and results.
Collaborator Contribution Sharing of test case data and computational results for collaborative analysis, with associated guidance to MSc student research project contributions.
Impact MSc theses and a journal publication as listed under Publications
Start Year 2016
 
Description Kinematic Optimisation & MDO 
Organisation University of Bristol
Country United Kingdom 
Sector Academic/University 
PI Contribution Exchange of information for Multi-disciplinary Optimisation tools and methods
Collaborator Contribution Provision of software and data to enable kinematic and multi-disciplinary optimisation for deployed high-lift wing profiles
Impact None as yet - papers planned and theses to result Multi-disciplinary: Aerodynamics, Structures, Loads, Mass estimation.
Start Year 2016
 
Description LBM Commercial CFD Software 
Organisation Next Limit Dynamics
Country Spain 
Sector Private 
PI Contribution Application of software as part of MSc training and research projects
Collaborator Contribution Provision of free licences to XFlow LBM CFD Software suite
Impact None as yet
Start Year 2016
 
Description Rolls-Royce Group plc 
Organisation Rolls Royce Group Plc
Country United Kingdom 
Sector Private 
PI Contribution Joint EPSRC Project collaboration with our group responsible for more fundamental computational simulation studies against experiment and mathematical formulae.
Collaborator Contribution Technical monitoring, advice, and beneficial guidance/interactions.
Impact As for Joint Grant partners University of Cambridge
Start Year 2010
 
Description University of Cambridge (Engineering & DAMTP) 
Organisation University of Cambridge
Country United Kingdom 
Sector Academic/University 
PI Contribution Joint EPSRC Project collaboration with our group responsible for more fundamental computational simulation studies against experiment and mathematical formulae.
Collaborator Contribution Joint EPSRC Project collaboration with collaborators at Cambridge University responsible for real engineering configuration computational simulation studies and separately mathematical formulae describing noise generation and interaction mechanisms.
Impact Multi-disciplinary: Computational fluid dynamics and computational acoustics analysis - both Engineering and Mathematical methods used. Outputs have included trained MSc students, project theses, a course directors prize, posters, conference and journal papers.
Start Year 2010