Improving gas turbine performance and reliability is very challenging target for most of the gas turbine designers. Secondary air system designer’s activities are involved in to increase pressure ratio of compressor and to increase turbine inlet temperature within structural limitations.
The main role of the secondary air system design is to provide all flow conditions in gas turbine system except primary flow path zone, such as cooling flow path, purge air flows in disk cavities and sealing flows in rotating and stationary parts. And also provide temperature conditions of whole gas turbine system at the all operating range.
For sub system level designing activities in gas turbine development. All sub components for secondary air system should built and validated within acceptable criteria to meet target performance.
In this paper, all kinds of secondary air system design works and results for 270MW class gas turbine power generation were described.