Fuel control system for a ram jet engine

摘要

A fuel control system for a ram jet engine has a metering orifice 20 controlled by a portion 18 of a stem 17 in accordance with an engine air pressure signal PR, for regulating flow to the main burners of the engine. A further metering orifice 21 downstream of the orifice 20 is controlled by a portion 19 of the stem 17 and regulates flow to the engine pilot burners. Main burner flow is additionally controlled by a valve 30 responsive to engine temperature. The arrangement is such that pilot burner flow is maintained substantially stoichiometric even when main burner flow shuts down in response to a temperature increase.