Critical flow nozzle for controlling fuel distribution and burner stability

摘要

A fuel delivery system for delivering fuel to a gas turbine engine includes a fixed critical flow nozzle, a first fuel nozzle and a second fuel nozzle. The fixed critical flow nozzle and the variable critical flow nozzle are connected to a fuel source in parallel. The fixed critical flow nozzle has an orifice throat with a fixed effective cross-sectional area. The variable critical flow nozzle has an orifice throat with a variable effective cross-sectional area. The first fuel nozzle is connected to the fixed critical flow nozzle for delivering fuel to the gas turbine engine, and the second fuel nozzle is connected to the variable critical flow nozzle for delivering fuel to the gas turbine engine.

主权项

1. A fuel delivery system for delivering fuel to a gas turbine engine, the fuel delivery system comprising:
a fixed critical flow nozzle connected to a fuel source, the fixed critical flow nozzle having an orifice throat with a fixed effective cross-sectional area; a variable critical flow nozzle connected to the fuel source and in parallel with the fixed critical flow nozzle, the variable critical flow nozzle having an orifice throat with a variable effective cross-sectional area, the variable critical flow nozzle further having:
an inlet;a nozzle having a converging-diverging shape and including the orifice throat and a recovery section downstream of the orifice throat; anda needle mounted on a spring biased piston, the needle positionable in the orifice throat to adjust the effective cross-sectional area of the orifice throat based upon a fuel pressure at the inlet; a first fuel nozzle connected to the fixed critical flow nozzle for delivering fuel to the gas turbine engine; and a second fuel nozzle connected to the variable critical flow nozzle for delivering fuel to the gas turbine engine.