Abstract
A new low NOx combustor for kerosene-fueled micro-gasturbine was proposed, and the combustion characteristics of prototype combustor were investigated. In order to enhance the recirculation in a primary combustion zone, a swirler was set between the primary and secondary combustion zones. Combustion air was introduced through the swirler and forced to flow upward to the combustor bottom, from where the fuel spray was supplied through a nozzle. The fundamental combustion characteristics such as lean combustion limit, flame luminosity etc. showed that this prototype combustor had a high potential for lean combustion and wide flame holding. Further, temperature distributions in the primary zone were investigated. In this report, we will clarify the characteristics of the NOx emission, propose the low NOx combustion technology for liquid fuel, and provide useful engineering guidelines for the development of the gas turbine combustor.
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