The effects of pressure on the performance and reaction characteristics of the catalytic combustion in a catalytic combustion camber are studied by using both numerical and experimental methods. It has been confirmed in the literature that catalytically stabilized lean premixed combustion technique can be applied to gas turbine engine to achieve the goal of high efficiency and low emissions. Catalytic combustor design operated in ultra-lean condition can provide remedies for almost all the defects of the traditional combustor, such as, low temperature operation with low NOx emission, simplification of complicated combustor design, good exit temperature pattern factor, eliminate the risk of hot spots due to dilution mixing, etc. However, the studies of the high pressure performance of the catalytic combustor are scarce and warranted. The results showed that increasing pressure has a negative effect on catalytic combustion in the combustor as they are usually operated on surface reaction conditions. As pressure is increased, the rate of reactant and product diffusion to and from the catalyst bed is reduced and increased fuel flow rate due to pressure increase will require more time to complete reaction of the catalyst surface in view of limited active sites. These effects will practically reduce the reaction and performance of the catalytic combustion in the combustor. On the other hand, instead of surface reaction, igniting gas phase reaction may specifically increase the combustion efficiency in high pressure.
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|Journal of Aeronautics, Astronautics and Aviation, Series A
|Published - 2006 4月
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