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The center section of the chamber housing surrounds the liner, providing an outer wall for the axial path of the air. The center section provides the mounting pads for the installation of fuel drain valves. The drain valves drain residual or accumulated fuel out of the combustion chamber after engine shutdown. This action prevents after fires or excessive starting temperatures during the next start. Located on the bottom of the housing are the spring-loaded combustion chamber drain valves. These valves drain automatically whenever internal chamber pressures approach atmospheric pressure. This fuel is drained to an overboard drain compartment in the airframe. The rear section converges to form a narrow annulus. This type of construction speeds up airflow before it enters the turbine section. Fuel is introduced through a series of nozzles at the upstream end of the liner. The fuel nozzles are screwed into fuel manifolds, located within two concentric fairings. If the chamber liner is of double-annular construction, there are two fuel manifolds. Only one manifold would be required if it were of single- annular construction. The two concentric fairings that support the fuel manifolds also perform the function of dividing the entering airflow into three concentric annular streams. The outer stream is delivered to the space between the combustion chamber liner and the chamber housing. The middle stream is delivered to the space between the inner and outer sections of the liner. The inner stream is delivered to the space between the liner and the rotor shaft housing. The two concentric fairings are supported by radial struts in the diffuser section. The rotor shaft housing, shown in Figure 1-30, provides the inner wall for the axial path of the air. This housing unit is attached to the rear face of the inner ring of the diffuser section. The housing is supported in the rear by components of the turbine section. The spark igniter plugs of the annular combustion chamber are the same basic type used in the can combustion chambers. There are usually two plugs mounted on the boss provided on each of the chamber housings. The plugs must be long enough to protrude from the housing into the outer annulus of the double-annular combustion chamber. Figure 1-30 — Can annular combustion chamber and components. 1-21PDF Image | JET ENGINE THEORY AND DESIGN
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