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TRIMIS

Near-Wall Simulations and Measurements in Lean-Burn Engines

PROJECTS
Funding
European
European Union
Duration
-
Geo-spatial type
Other
Total project cost
€1 476 145
EU Contribution
€1 107 106
Project Acronym
NEWSMILE
STRIA Roadmaps
Vehicle design and manufacturing (VDM)
Transport mode
Airborne icon
Transport policies
Environmental/Emissions aspects,
Safety/Security
Transport sectors
Passenger transport,
Freight transport

Overview

Call for proposal
SP1-JTI-CS-2013-03
Link to CORDIS
Objectives

In modern aero-engine combustors combustor tiles are used to protect the walls from the hot gases, the temperature of which is rising in new engines due to increasing pressure ratios. However, the amount of air used for wall cooling should be reduced to allow for maximal air flow rates through the fuel injector. This measure enables optimised lean combustion with lowest pollutant emission rates. This objective can be achieved by combining effusion cooling on the hot side with impingement cooling on the cold side of the tiles. This complex system needs to be simulated during design processes.

This project aimed to improve the predictive capabilities and decrease the uncertainties of current models regarding wall temperatures and thermal stresses. The model development was supported and the emerging method was validated by high-quality experimental data obtained from measurements on an engine-representative gas turbine combustor using Particle Image Velocimetry, Thermographic Phosphor Thermometry and Coherent anti-Stokes Raman Spectroscopy.

An iterative method was proposed which couples tabulated chemistry based CFD and finite element method (FEM) simulations. In the CFD calculations, previously ignored flame-wall interactions were considered by adjusting turbulence models and extending the tabulation method to non-adiabatic conditions. Results of highly resolved large eddy simulations were used to improve the computationally efficient RANS based techniques. The CFD calculations provided the convective heat transfer for the FEM simulations as a boundary condition. For an accurate prediction of the metal temperature – which is then fed back into the CFD part - and thermal stresses provided by the FEM, a probabilistic approach was applied. A Monte Carlo method with a meta-model was used to evaluate the thermal stochastic output improving the current state-of-the-art of thermal predictions.

Funding

Parent Programmes
Institution Type
Public institution
Institution Name
European Commission
Type of funding
Public (EU)
Specific funding programme
JTI-CS - Joint Technology Initiatives - Clean Sky
Other Programme
JTI-CS-2013-3-SAGE-06-011 Design methods for accurate combustor wall temperature

Results

Executive Summary:

An effusion cooled liner segment was installed into a pressurised combustor. A piloted lean premixed swirling flame was operated such that the impinging region at the effusion cooling plate was accessible to laser diagnostic investigations. Using coherent anti-Stokes Raman spectroscopy, phosphor thermometry, and stereoscopic particle image velocimetry the interaction between flame and cooling jets was examined in detail. Large Eddy Simulations and Reynolds Averaged Navier Stokes computations of the test rig have been conducted.

Chemistry look-up tables were generated and used from the flamelet generated manifold (FGM) model and integrated with the ß-function as presumed probability density function. RANS computations also tested the implemented models for radiative heat fluxes. These were supported by radiative spectral measurements of the test rig tile and the combustor tile of the ITD owner. All CFD investigations were coupled to Finite-Element Methods. The near-wall temperature and heat transfer coefficients were provided by CFD to FEM, so that a thermal analysis would return a more appropriate metal temperature for CFD in return. The numerical investigations include grid studies, the application of different parameters and the analysis of differences and deviations from the experimental results. The made experiences resulted in recommendations and suggestions of methodology for the analysis of the real aero-engine combustor.

Partners

Lead Organisation
Organisation
Technische Universitat Darmstadt
Address
KAROLINENPLATZ 5, 64289 DARMSTADT, Germany
Organisation website
EU Contribution
€618 385
Partner Organisations
Organisation
Universitaet Der Bundeswehr Muenchen
Address
Werner Heisenberg Weg 39, 85577 Neubiberg, Germany
Organisation website
EU Contribution
€254 971
Organisation
University Of Surrey
Address
Stag Hill, Guildford, GU2 7XH, United Kingdom
EU Contribution
€233 750

Technologies

Technology Theme
Aircraft propulsion
Technology
Lean combustion for ultra-high pressure ratio
Development phase
Validation

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