COMBUSTION CHAMBERS FOR GAS TURBINE ENGINES

• US 3,593,518 A
• Filed: 09/17/1969
• Issued: 07/20/1971
• Est. Priority Date: 09/20/1968
• Status: Expired due to Term

• Current Assignee: Gerrard Alan Joseph
• Original Assignee: Gerrard Alan Joseph
• Inventors: GERRARD ALAN JOSEPH
• Application Number:
  US04/858,770
• Time in Patent Office: 671 Days
• US Class Current: 60/752
• CPC Class Codes: F23R 3/04 Air inlet arrangements
• CPC Class Codes: F23R 3/06 Arrangement of apertures along the flame tube
• CPC Class Codes: F23R 3/26 Controlling the air flow

Abstract

A combustion chamber for a gas turbine engine has a primary air inlet and a number of additional air nozzles at intervals along the chamber. Each of the air inlets has one or more holes in the inlet wall, so that air may be injected into the inlets or extracted therefrom. Air injection effectively reduces the inlet areas and extraction increases the inlet areas. The airflow through each inlet, or group of inlets, may thus be controlled, the arrangement being such that, irrespective of the proportion of the total airflow which enters each inlet, the resistance to airflow through the combustion chamber does not vary. The holes in the inlet walls may be tangential to create a vortex within the inlet.

Claims

1. A combustion chamber which includes a primary air inlet duct, secondary air inlet nozzles and dilution air inlet nozzles, each air entry point incorporating a fluidic airflow control device arranged so that the proportions of the total airflow through the respective air entry points can be varied without variation of the total resistance of the combustion chamber to airflow therethrough.

2. A combustion chamber as claimed in claim 1 in which the primary air inlet duct incorporates holes through which air may be injected or withdrawn so as respectively to increase or decrease the effective area of the duct.

3. A combustion chamber as claimed in claim 2 in which the said holes are formed in the outer periphery of the duct.

4. A combustion chamber as claimed in claim 1 in which the secondary air inlet nozzles are constituted by inwardly directed flanges on the walls of the chamber, said flanges being formed with drillings in the upstream sides thereof through which air may be injected or withdrawn so as respectively to reduce or increase the effective areas of the nozzles.

5. A combustion chamber as claimed in claim 1 in which the dilution air inlet nozzles are constituted by inwardly directed flanges on the walls of the chamber, said flanges being formed with drillings through which, in use, high-pressure air is injected tangentially into the nozzles.

6. A combustion chamber as claimed in claim 1 in which the dilution air inlet nozzles are constituted by inwardly directed flanges on the walls of the chamber, said flanges being formed with drillings in the upstream sides thereof through which air may be injected or withdrawn so as respectively to reduce or increase the effective areas of the nozzles.

7. A combustion chamber as claimed in claim 1 in which the secondary air inlet nozzles are constituted by inwardly directed flanges on the walls of the chamber, said flanges being formed with drillings through which in use high pressure air is injected tangentially through the nozzles.