Combustor, gas turbine

Patent metadata

Field	Value
Publication number	US-11215364-B2
Application number	US-201716079865-A
Country	US
Kind code	B2
Filing date	Feb 27, 2017
Priority date	Feb 29, 2016
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A combustor includes: a first cylindrical body which is configured to hold a fuel nozzle extending in an axial line direction and through which air flows toward a downstream side thereof; a second cylindrical body that is connected to a downstream side of the first cylindrical body; and an outer shell that has an inner peripheral surface configured to define an air introduction channel through which air is introduced such that the air reverses course at an upstream end of the first cylindrical body and flows toward the downstream side together with an outer peripheral surface of the first cylindrical body. The inner peripheral surface has an outside narrowing surface that is formed to extend inward in a radial direction toward the upstream end of the first cylindrical body.

First claim

What is claimed is:

1. A combustor, comprising:
a first cylindrical body which is configured to hold a fuel nozzle extending in a direction of an axial line and through which air flows toward an aft side thereof;
a second cylindrical body which is connected to the aft side of the first cylindrical body; and
an outer shell which has an inner peripheral surface configured to define, together with an outer peripheral surface of the first cylindrical body, an air introduction channel through which the air is introduced such that the air reverses course at a forward end of the first cylindrical body toward the aft side,
wherein the outer shell includes a fitting convex portion which is fitted to an inner peripheral side of a combustor insertion port provided in a turbine casing,
wherein an inner peripheral surface of the fitting convex portion has an outside narrowing surface at an aft end of the outer shell which is formed to extend inward in a radial direction toward the forward end of the first cylindrical body,
wherein an inner peripheral surface of the combustor insertion port has a constant diameter, and wherein the outer shell is in direct contact with the inner peripheral surface of the combustor insertion port from a forward end of the combustor insertion port to the aft end of the outer shell.

2. The combustor according to claim 1 , wherein the first cylindrical body includes a swollen portion arranged at the forward end of the first cylindrical body, the swollen portion having a greater thickness than that of any other portion of the first cylindrical body,
and wherein an inside narrowing surface is formed on the outer peripheral surface of the first cylindrical body, the inside narrowing surface sloping outward in the radial direction toward the forward end of the first cylindrical body and extending to a radially outer surface of the swollen portion, the inside narrowing surface being arranged so as to face the outside narrowing surface in the radial direction.

3. The combustor according to claim 2 , wherein, when an angle formed by the axial line and the outside narrowing surface in a cross-sectional view including the axial line is defined as α and an angle formed by the axial line and the inside narrowing surface is defined as β, a relationship of α<β is satisfied.

4. The combustor according to claim 3 , wherein a forward end portion of the outside narrowing surface is located farther forward than a forward end portion of the inside narrowing surface.

5. The combustor according to claim 2 , wherein a forward end portion of the outside narrowing surface is located farther forward than a forward end portion of the inside narrowing surface.

6. A gas turbine, comprising:
a compressor which is configured to generate compressed air;
the combustor according to claim 1 ; and
a turbine which is rotatably driven by a combustion gas generated by the combustor.

Assignees

• Mitsubishi Hitachi Power Sys Ltd
• Mitsubishi Power Ltd

Inventors

• Miyamoto Kenji
• Takiguchi Satoshi
• Nishida Koichi
• Hirata Yoshitaka
• Numata Shohei
• Yunoki Keita
• Akiyama Yasuhiro
• Uruno Tomoki

Classifications

• F02C7/22

  Fuel supply systems · CPC title

• F23R3/16 Primary

  with devices inside the flame tube or the combustion chamber to influence the air or gas flow · CPC title

• F23R3/286

  having fuel-air premixing devices (F23R3/30 takes precedence) · CPC title

• F23R3/002

  Wall structures (F23R3/02 and F23R3/007 take precedence) · CPC title

• F23D2900/14004

  with radially extending gas distribution spokes · CPC title