Fuel/air premixer for gas turbine combustor
AssigneeJapan Aerospace Exploration Agency
InventorShigeru Hayashi
Life of this patent
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Abstract
A fuel/air premixer for use in a gas turbine improves the atomization performance and mixing performance of the fuel by guiding an air so as to flow in an outward radial direction. A flow-deflecting tubular body having an annular cross section is disposed on the inside of and coaxially with a liquid film-forming body of an airbiast atomizer nozzle disposed at the inlet portion of a premixing tube. The outer peripheral surface of the flow-deflecting tubular body has a wall surface which increases in outer diameter toward the tip end of a first annular passage. The inner peripheral surface of the flow-deflecting tubular body has a form in which the inner diameter has a minimum to form a contracted portion, and then increases dramatically toward the tip end.
Claims9
A fuel/air premixer for a gas turbine combustor, wherein:
- an airblast atomizer nozzle comprising a liquid film-forming body, a tubular inner surface of which serves as a fuel liquid film-forming surface, is disposed at an inlet portion to a tubular premixing tube as fuel atomizing means;
- a flow-deflecting tubular body having an annular cross section is disposed on the inside of and coaxially with said liquid film-forming body;
- a first air swirler is disposed in an upstream portion of an annular passage formed between an outer peripheral surface of said flow-deflecting tubular body and said liquid film-forming surface of said liquid film-forming body;
- a second air swirler is disposed in an upstream portion of a passage which comprises as a wall surface an inner peripheral surface of said flow-deflecting tubular body,
- said flow-deflecting tubular body takes a form in which an outer diameter defining said outer peripheral surface increases toward a tip end of said annular passage, and an inner diameter defining said inner peripheral surface has a minimum downstream of a downstream end of said second air swirler, and then increases toward the tip end of said passage;
- and
- a third air swirler is disposed on the outside of said liquid film-forming body in an upstream portion of an annular passage which comprises as a wall surface an inner peripheral surface of said premixing tube.
Dependencies are inferred from the claim text.