Gas burning appliances used in the domestic and commercial markets incorporate laminar flame burners that are made up of a number of ports which give rise to multiple laminar flames. Virtually all current burners use premixed natural gas-air mixtures giving rise to partially or folly aerated flames. The increasing demand for improvements in appliance efficiency and reduction in emissions has meant that combustion on such burners has been of renewed interest lately. Advanced laser diagnostic and computational modelling techniques are now being used to develop a basic understanding of how burner design affects combustion performance. This paper presents the results of a detailed optical-diagnostic study of the structure of two-dimensional, premixed laminar flames stabilized on a multi-slot burner. Measurements have been made in fuel-lean, stoichiometric and fuel-rich flames, with detailed data obtained using Raman scattering for major chemical species, laser-induced fluorescence for minor species, and coherent anti-Stokes Raman spectroscopy for temperature. The data gathered give insights into the structure of these practically relevant flames, and are also of value in the validation of computational models for use in burner design.
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