2h-CARS (two wavelength Coherent Anti-Stokes Raman Scattering) was used for non-intrusive temperature measurements in a turbulent, bluff body stabilized flame. The time resolved temperature data is presented for several test conditions including stable conditions used for computer code validation, and unstable conditions when combustion induced pressure oscillations occurred. Various schlieren and photographic methods were also used for flame visualization at the conditions corresponding to the CARS test conditions. The 2h-CARS technique proved to be a robust, accurate technique with excellent time resolution. CARS thermometry and visualization techniques are powerful tools in the process of understanding turbulent combustion phenomena.

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The design of a generic experimental LPP-combustor (Lean Premixed Prevaporized) is described. The combustor was tested at inlet pressures between 3 and 7 bar and with an inlet temperature between 500 K and 700 K. Tests were run with Diesel No.2 and Jet A-1 fuels comparing emissions of CO and NOx. The tests showed low NOx and CO values for a range of conditions although difficulties of using the LPP-technique close to the final boiling point of the fuel were encountered. To increase the understanding of the flow situation inside the combustor, numerical simulations using a large eddy simulation code was also performed. The main interest in the calculations was the evaporation process of the liquid fuel.