Turbine engine fuel injector with leakage flow controlled by position of metering valve

摘要

A fuel injector for a turbine engine, the injector including a body including a primary fuel circuit and a secondary fuel circuit fed by a metering valve. A leakage channel extends from a zone in fluid flow connection with the primary circuit to a zone in fluid flow connection with the secondary circuit. The leakage channel is configured to be open in a closed position of the metering valve and to be closed by the metering valve moving.

主权项

1. A fuel injector for a turbine engine or an airplane turboprop or turbojet, the fuel injector comprising:
a body including an admission orifice for admitting fuel under pressure; a stop valve mounted in the body downstream from the admission orifice and configured to open at a first determined fuel pressure and to remain open beyond the first determined fuel pressure to feed a primary fuel circuit; a metering valve mounted in the body downstream from the stop valve and configured to open beyond a second determined fuel pressure greater than the first determined fuel pressure, and to remain open beyond the second determined fuel pressure to feed a secondary fuel circuit; and at least one leakage channel extending from a zone situated downstream from the stop valve and upstream from the metering valve to a zone situated downstream from the metering valve to generate a leakage flow in the secondary circuit, the at least one leakage channel being configured to be open in a closed position of the metering valve and to be closed by the metering valve moving.