| 摘要 |
PURPOSE:To prevent production of nitrogen oxide and to improve flame stabilizing properties within a wide range of a fuel-air ratio, by a method wherein, in a gas turbine combustor using gas fuel, a throttle is formed up the flow of fuel from a burning hole located nearmost to the opening end of a tubular fuel nozzle, and a spread ratio down the flow of gas fuel from the throttle is specified. CONSTITUTION:A throttle 13 is formed up the flow of gas fuel from a number of small burning ports 4, and the throttle is spread at a one-side spread angle of 7 deg. or more so that a stagnating flow 14 is formed in the vicinity of the wall surface on the downstream side of the throttle. This causes a static pressure on a wall surface to be generated at a value about equal to the total pressure of fuel. A portion on the downstream side is structured such that the passage area of the fuel is gradually decreased, and this causes the fuel to flow such that the flow rate of a point on the flow passage decreases the further downward this point is situated, reduces a dynamic pressure, and improves uniformization of flow rate distribution. This constitution prevents production of nitrogen oxide and permits improvement of flame stabilizing properties within a wide range of fuel-air ratio.
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