| 摘要 |
<p>An annular combustor system has an annular housing defining a single stage combustor, an external fuel/air premixer system to provide a preselected, nominally constant lean fuel/air ratio mixture for introduction to the combustion zone of the annular housing. Compressed air conduits channel a portion of the total compressed air flow to the premixer and the remainder to the dilution zone of the combustor. Convection cooling of the annular housing and the turbine shroud is accomplished using essentially the remainder portion of the compressed air without diluting the fuel air ratio in the combustion zone. The premixer includes a venturi, and a fuel nozzle for spraying fuel into the venturi inlet along the venturi axis to provide admission of the fully premixed fuel/air mixture. The venturi includes a perforated flow-smoothing and premixing initiating member surrounding both the venturi inlet and the fuel nozzle exit which is spaced from the venturi inlet to prevent impingement of the liquid fuel spray on the venturi walls and augment vaporization of liquid fuels. <MATH></p> |
