Skip to main content

Near-Wall Simulations and Measurements in Lean-Burn Engines

Objective

"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 aims for improving the predictive capabilities and decreasing the uncertainties of current models regarding wall temperatures and thermal stresses. The model development will be supported and the emerging method will be 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 is proposed which couples tabulated chemistry based CFD and finite element method (FEM) simulations. In the CFD calculations previously ignored flame-wall interactions will be considered by adjusting turbulence models and extending the tabulation method to non-adiabatic conditions. Results of highly resolved large eddy simulations will be used to improve the computationally efficient RANS based techniques. The CFD calculations will provide 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 will be applied. A Monte Carlo method with a meta-model will be used to evaluate the thermal stochastic output improving the current state-of-the-art of thermal predictions."

Field of science

  • /natural sciences/chemical sciences/analytical chemistry/spectroscopy
  • /engineering and technology/environmental engineering/energy and fuels/fossil energy/gas
  • /natural sciences/physical sciences/thermodynamics

Call for proposal

SP1-JTI-CS-2013-03
See other projects for this call

Funding Scheme

JTI-CS - Joint Technology Initiatives - Clean Sky

Coordinator

TECHNISCHE UNIVERSITAT DARMSTADT
Address
Karolinenplatz 5
64289 Darmstadt
Germany
Activity type
Higher or Secondary Education Establishments
EU contribution
€ 618 385
Administrative Contact
Melanie Meermann-Zimmermann (Dr.)

Participants (2)

UNIVERSITY OF SURREY
United Kingdom
EU contribution
€ 233 750
Address
Stag Hill
GU2 7XH Guildford
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Maria Sega-Buhalis (Mrs.)
UNIVERSITAET DER BUNDESWEHR MUENCHEN
Germany
EU contribution
€ 254 971
Address
Werner Heisenberg Weg 39
85579 Neubiberg
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Elisabeth Eder (Mrs.)