| 摘要 |
PROBLEM TO BE SOLVED: To uniform the mixing condition of fuel and gas in a state where the load of a gas turbine is varied and a fuel flow rate is varied, by alternately establishing large diameter nozzle holes and small diameter nozzle holes in a circumferential direction, and conducting switching between a fuel supply path which communicates with the large diameter nozzle hole and a fuel supply path which communicates with the small diameter nozzle hole, according to the load variation. SOLUTION: A main fuel nozzle body 50 is provided in its circumference at a downstream side with large diameter nozzle holes 53 and small diameter nozzle holes 54 having a smaller diameter than the former, which are alternately arranged and established in the circumferential direction. There are also provided a fuel supply path 52 which communicates with the large diameter nozzle hole 53 and a fuel supply path 51 which communicates with the small nozzle hole 54. The path 51 and the path 52 are selectively used to suitably supply fuel therethrough in accordance with the load variation of a gas turbine. For example, when low load is imposed on the gas turbine, as the fuel flow rate is reduced, the path 51 is selected to jet the fuel to fuel air through the small nozzle hole 54.
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