FIRST-STAGE NOZZLE ASSEMBLY.--
first-stage nozzles are cooled by air from the
The first-stage nozzle assembly has the nozzle
compressor's 16th stage. The first-stage nozzle
support, the nozzles, the inner seal, the outer seal,
support forms the inner flow path wall from the
and baffles (fig. 2-32). The nozzles are coated to
compressor rear frame to the nozzle segments.
improve erosion and oxidation resistance. They
Additionally, it supports the nozzle segments. It
are bolted to the first-stage nozzle support and
is bolted to the aft end of the pressure balance
receive axial support from the second-stage
seal support.
nozzle support. The nozzle assembly has 32 nozzle
segments, each segment has two vanes. The vanes
SECOND-STAGE NOZZLE ASSEMBLY.--
are cast and then welded into pairs (segments) to
The major parts of the second-stage nozzle
decrease the number of gas leakage paths. The
assembly (fig. 2-33) are the nozzles, the nozzle
Figure 2-32.--First-stage HP turbine nozzle.
Figure 2-33.--Second-stage HP turbine nozzle.
2-27