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A fuel/air mixing arrangement for a combustion apparatus such as a gas turbine comprises a first swirler in which air and fuel are mixed to form a fuel/air mixture, a first conduit to supply a first proportion of the mixture to the combustion apparatus, a second swirler arranged to receive a second

A fuel/air mixing arrangement for a combustion apparatus such as a gas turbine comprises a first swirler in which air and fuel are mixed to form a fuel/air mixture, a first conduit to supply a first proportion of the mixture to the combustion apparatus, a second swirler arranged to receive a second proportion of the mixture, and a second conduit to supply the second proportion from the second swirler to the combustion apparatus.

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[ I claim:] [1.]1. In a gas turbine engine having a combustion apparatus including:A) a combustion chamber having a combustion zone, andB) a fuel/air mixing arrangement for delivering fuel/air mixture to the combustion zone, the mixing arrangement being of generally circular configuration about an a

[ I claim:] [1.]1. In a gas turbine engine having a combustion apparatus including:A) a combustion chamber having a combustion zone, andB) a fuel/air mixing arrangement for delivering fuel/air mixture to the combustion zone, the mixing arrangement being of generally circular configuration about an axial centerline and comprising:a) primary radial inflow swirler passage means having, in flow series, radially outer air intake means, fuel injection means, and radially inner fuel/air mixture outlet means, the primary swirler passage means being operative for mixing air and fuel to form a radially inflowing fuel/air mixture;b) radially inward of and concentric with the primary swirler passage means, an axially extending annular conduit having first and second ends, the first end of the annular conduit communicating with the outlet means of the primary swirler passage means to receive a first proportion of the fuel/air mixture therefrom, and the second end of the annular conduit communicating with the combustion chamber to deliver the first proportion of the fuel/air mixture to a radially outer region of the combustion zone therein,c) radially inward of and concentric with the primary swirler passage means, secondary radial inflow swirler passage means having, in flow series, radially outer fuel/air mixture intake means and radially inner fuel/air mixture outlet means, the intake means of the secondary swirler passage means communicating with the outlet means of the primary swirler passage means to receive a second proportion of the fuel/air mixture therefrom, andd) radially inward of and concentric with the axially extending annular conduit and the secondary swirler passage means, an axially extending central conduit having first and second ends, the first end of the central conduit communicating with the outlet means of the secondary swirler passage means to receive the second proportion of the fuel/air mixture therefrom, and the second end of the central conduit communicating with the combustion chamber to deliver the second proportion of the fuel/air mixture to a radially inner region of the combustion zone.