72-40-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
A
SEE A
FWD
L-A0274 DIFFUSER/COMBUSTOR CASE A
A
NO. 3 BEARING NO. 3 BEARING
COMPARTMENT
DIVERGENT DIFFUSER AIRFLOW NOZZLE
COMPRESSOR EXIT STATOR
INNER WALL OF THECOMBUSTION CHAMBER
FUEL INJECTOR (NOZZLE)
OUTER COMBUSTION CHAMBER
DIFFUSER
CASE DIFFUSER CASE
STRUT
DOWELED END
(COMBUSTION CHAMBER
RETAINING) BOLT
OUTER WALL OF THE
A-A COMBUSTION CHAMBER
L-A0275
Combustion Section
Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
4. Combustion Chamber (Fig. 1)
__________________
A. The combustion chamber is fabricated in two sections. The inner combustion chamber is a part of the turbine section (AMM 72-50-00/001). The outer ombustion chamber is a part of the diffuser and combustor section. The two combustor chambers form a short double pass flow type burner utilizing a welded rolled ring construction for the liner section and a cast bulkhead. The inner surfaces, which are exposed to combustion gases, are coated with a magnesium zirconate material as a thermal barrier protection.
B. The outer chamber is retained to the outer wall of the diffuser case at the forward end by twelve doweled end bolts. The rear of the chamber is positioned and retained to the turbine nozzle by a guide and circumferential clamp assembly. The guide and clamp assembly are adjusted during assembly to provide a slip-fit sealing feature with the outer diameter of the combustion chamber.
C. The combustion chamber provides mixing of the fuel from the fuel injectors with the proper amount of air for optimum combustion. Combustion of the fuel is contained within the forward and middle section of the chamber, aft of the fuel injectors. The rear portion of the chamber allows for complete mixing of the remaining airflow with the hot combustion gases and for the transition to the turbine nozzle.
5. No. 3 Bearing and Compartment (Fig. 1)
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