Apparatus for regulation of airflow to flame tubes for gas turbine engines

Claim 1

An annular section flame tube for a gas turbine engine comprising an annular chamber having an annular primary combustion air inlet, at least one annular passage coaxial with the chamber, a plurality of secondary combustion air inlets opening into the chamber downstream of the primary combustion air inlet, a plurality of dilution air inlets opening into the chamber downstream of the secondary combustion air inlets, a duct into which the secondary combustion air inlets open, a plurality of passages respectively connecting the dilution air inlets to said duct, said passages and said secondary combustion air inlets being arranged in pairs, said secondary combustion and dilution air inlets being formEd as plunged holes directed inwardly of the chamber, whereby air flow through these inlets penetrates deeply into the chamber, and a plurality of valve members in said duct movable in unison between positions in which they obstruct the secondary combustion air inlets and positions in which they obstruct the entries to said passages.