DOC AIRBUS | AMM A320FHPT NOZZLE ASSEMBLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The high pressure turbine (HPT) nozzle is a single-stage air cooled assembly that mounts in the combustion case and directs the gas flow from the combustion chamber onto the blades of the HPT rotor at the optimum angle.
The major parts of the nozzle are 21 nozzle segments and inner support. The aft support and seal assembly, while not integral components of the HPT nozzle module are included since they attach to the HPT stator parts.
** ON A/C NOT FOR ALL The high pressure turbine (HPT) nozzle is a single-stage air cooled assembly that mounts in the combustion case and directs the gas flow from the combustion chamber onto the blades of the HPT rotor at the optimum angle.
High Pressure Turbine NozzleThe major parts of the nozzle are 21 nozzle segments and inner support. The aft support and seal assembly, while not integral components of the HPT nozzle module are included since they attach to the HPT stator parts.
2. Description
A. Nozzle Segments
The HPT nozzle segments are assemblies of 2 vane/platform castings that are brazed together. Each vane is a cast shell divided into forward and aft compartments by an inner rib. The vanes and platforms are cooled by compressor discharge air entering the vane compartments through inserts in the inner and outer ends of vanes and exiting through the vane leading and trailing edges. The vanes and platforms are made of high strength nickel base alloy with protective coating on vane airfoils and on platform flowpath surfaces.
The HPT nozzle segments are assemblies of 2 vane/platform castings that are brazed together. Each vane is a cast shell divided into forward and aft compartments by an inner rib. The vanes and platforms are cooled by compressor discharge air entering the vane compartments through inserts in the inner and outer ends of vanes and exiting through the vane leading and trailing edges. The vanes and platforms are made of high strength nickel base alloy with protective coating on vane airfoils and on platform flowpath surfaces.
B. Inner Support
The nozzle inner support is a one-piece nickel base alloy ring. The major portion of the nozzle axial load is carried by the inner support through the bolted flanges of the support and nozzle inner platforms. The nozzle inner platform and the inner support form a seal ring which controls the amount of cooling air leakage that passes between the seal and the HPT blades.
The nozzle inner support is a one-piece nickel base alloy ring. The major portion of the nozzle axial load is carried by the inner support through the bolted flanges of the support and nozzle inner platforms. The nozzle inner platform and the inner support form a seal ring which controls the amount of cooling air leakage that passes between the seal and the HPT blades.
C. Aft Outer Support and Seal
The aft outer support is a one-piece nickel base alloy ring that provides support for the 4-step honeycomb seal that mates with the HPT rotor inducer seal to help maintain the proper amount of cooling air flow and rotor thrust.
The aft outer support is a one-piece nickel base alloy ring that provides support for the 4-step honeycomb seal that mates with the HPT rotor inducer seal to help maintain the proper amount of cooling air flow and rotor thrust.