MEASUREMENTS OF OH BY LIF AND TEMPERATURES BY HOLOGRAPHIC-INTERFEROMETRY IN CATALYTICALLY STABILIZED COMBUSTION OF HYDROGEN - COMPARISON OFMEASUREMENTS AND NUMERICAL-SIMULATION

To investigate the catalytically stabilized combustion of hydrogen in a duct, hydroxyl radical and temperature distributions have been measu red by LIF and holographic interferometry, resp. A detailed two-dimens ional numerical model has been developed. For the heterogeneous reacti on mechanism simplifications are introduced which are justified by an analysis of the elementary heterogeneous reaction mechanism proposed b y Hellsing et al. 1991. Experimental results and numerical simulation are in good agreement. The numerical model allows the identification o f the relevant coupling mechanism between heterogeneous and homogeneou s combustion of hydrogen. These are: radical recombination reactions a t the wall, diffusive fluxes of H-2, O2, H2O due to the heterogeneous reactions and heat transfer from the wall to the gas. The desorption o f radicals from the surface into the gas does not play a significant r ole in this system.