Combustion Chamber 2/5

Basic Systems•Multiple•Tubo-Annular•Annular Intro Process Fuel Supply

Types Materials AE 424COMBUSTION CHAMBER

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

• Each interconnected can has its own fuel injector, igniter, liner, and casing; all acting as an individual burner units

• The interconnectors are required for flame propagation during ignition and for even pressure distribution throughout the combustion section. (flame propagation tubes)Intro Process Fuel Supply

Types Materials AE 424COMBUSTION CHAMBER

• Air from the compressor enters each individual chamber through a transition section.

• Combustion occurs within the inner liner.

• Louvers and holes control airflow into the combustion area.

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

Pros and Cons• a high resistance

to warpage because of large

degree of curvature

• amount of space required and the added weight because of the shape

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

** provides a larger combustion volume per unit of exposed metal

area

• Annular inner and outer AIR CASINGS form a tunnel around the

centre line of the engine• The FLAME TUBE is located in the space between the inner and outer

air casing. • Need for INTERCONNECTORS

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

• USAGE: both small and large engines• MOST EFFICIENT: thermal efficiency,

weight, and physical size• Process: similar to multiple-can design• Maintenance: removed as a single unit;

complete separation of the engine at a major flange.

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

• The “Half-Way House”• combination of both annular (outer shell)

and can-type (number of cans) designs mounted about the engine axis.

• Inner combustion chamber casing: serves as structural support and a heat shield

• Bearing oil supply lines run through it

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

• was invented by Pratt & Whitney • removable steel shroud= encircles the

entire combustion section. • multiple burner cans assembled radially

around the engine axis can-annular combustor (ease of maintenance) contains individual burner cans in an annular liner

(compact efficiency)

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER

• Multiple- earlier engines usage; simple to dismantle; bulky

• Tubo-annular- more compact, with a smooth exterior and reduced weight

• Annular system- much more compact system and, same power output and mass flow, shorter upto 25% length

Intro Process Fuel Supply Types Materials AE 424COMBUSTION CHAMBER