Objectives and content
Nitrogen oxide emissions by aircraft make a small but important contribution to pollution, not least because the emissions are at high altitude where their impact is more significant than at ground level. To address this issue, in the CEC Brite-Euram "Low Emissions Combustor Technology, Phase II" project (AERO-CT92-0036) all the industrial partners have chosen to pursue the "Lean Prevapourised Premixed" or LPP combustor technology. LPP is currently seen as the only technology which has a sensible level of technology risk and which will potentially meet and exceed likely future emission levels.
Current Computational Fluid Dynamic (CFD) modelling methods cannot model the premixed, swirling combustion and account fully for droplet turbulence interactions in LPP mixers with sufficient accuracy. A new approach is required; in this proposal we propose the development of Large Eddy Simulation (LES) Modelling and to adapt it by specific, targeted, improvements for LPP combustion. The specific developments required are to improve LES for swirling flows, to incorporate two-phase modelling in LES (to describe the pre-vapouriser premixer duct of LPP combustor), and to incorporate an effective combustion model into LES sufficient to predict combustion temperatures such that accurate estimates of NOx emissions are possible.
The objective of this project is to develop Large Eddy Simulation Modelling to adapt it by specific developments for application to LPP combustion and to transfer the technology to gas turbine industry as represented by the industrial partners in the first instance.
To achieve this objective the proposal has five sub-tasks:
- Develop Basic Tools to improve LES modelling of highly swirling flows.
- Develop Sub-Grid Scale (SGS) Modelling of two phase flow.
- Develop LES Combustion Modelling.
- Validation of models & sub models (includes experimental measurements).
- Transfer of Technology to Industry.
The project combines a development of LES modelling and an experimental measurement programme designed to provide validation data for the models particularly in respect of two-phase evaporating swirling flows and swirling, recirculating combustion.
The project consists of 4 partners from the aero-engine industry and 7 university partners from 4 European States.
Funding SchemeCSC - Cost-sharing contracts
412 96 Goeteborg
221 00 Lund
LE11 3TU Loughborough
DE24 8BJ Derby
GU14 0LS Farnborough
77550 Moissy Cramayel
461 81 Trollhättan