Air shield for a fuel injector of a combustor

Abstract

An air shield (100, 200) for an injector (32) of a combustor is provided, and includes a first section (102) that extends axially from a first end (101) to a second end (103), and a channel (112) defined by the air shield. The channel includes at least one inlet proximate to the second end. The at least one inlet is configured to receive a channel airflow (144) that is a portion of a surrounding airflow (44). The channel (112) is configured to control a distribution of the channel airflow (144) to the injector (32).

Description

technical field [0001] The field of the invention relates generally to a fuel injector for a combustor of a rotary machine, and more particularly to an air shroud for controlling air flow to the fuel injector. Background technique [0002] At least some known combustors used with rotary machines, such as gas turbines, include at least one secondary fuel injector, commonly referred to as a "late lean injector," located downstream of the primary fuel injector. At least some known late lean injectors mix a fuel supply with an air supply, such as from a compressor exhaust cylinder. However, this air supply may not be as stable or uniform as desired under some operating conditions, and there is a potential for small amounts of fuel to escape outside the combustor through the late lean injector. Contents of the invention [0003] In one aspect, the invention provides an air shroud for an injector of a combustor. The air shroud includes a first section extending axially from a ...

AI Technical Summary

Problems solved by technology

However, this air supply may not be as stable or uniform as desired under some operating conditions, and there is a potential for small amounts of fuel to escape outside the combustor through late lean injectors

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