Abstract
The design of a premix duct is heavily reliant upon knowledge of the auto-ignition delay time for a given fuel-air mixture and operating range. An experimental investigation into the auto-ignition characteristics of alternative gaseous and liquid fuels has been carried out and the results compared against those for the conventional fuels. Gaseous fuels derived from sources such as bio-gas and refinery wastes were successfully compared against datum fuels of natural gas and methane — whilst among the liquid fuels — 100% biodiesel (consistent with BS EN 14214) and grade 2 diesel were tested and compared. The experimental results were obtained using a flow rig equipped with a generic premix duct and operated at GT-relevant conditions. For the gaseous fuels no ignition events were detected within the maximum test section residence time of 130ms. Therefore, a kinetic scheme previously validated at GT relevant conditions was used to evaluate effects of temperature, pressure and equivalence ratios for the gaseous fuels under investigation. In general gaseous fuels were found to have long auto-ignition delay times at temperatures < 900K and no differences were found between grade 2 diesel and 100% biodiesel. Therefore, the results under this study would be useful to the operators and designers of DLE systems when evaluating potential replacements for the current traditional fuels.
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