What is the purpose of the interstage seal?

The purpose of the interstage seal is to minimize gas leakage between the second stage nozzles and the turbine rotor. This sealing is critical because it ensures that the hot gases produced in the combustion chamber are effectively directed through the turbine stages, maximizing the energy extracted from the gas.

When gas leaks occur between the nozzle and rotor, it can drastically reduce the efficiency of the turbine by allowing energy that should be used for work to escape without performing useful work. By preventing this leakage, the interstage seal plays a key role in maintaining the pressure and temperature conditions necessary for optimal turbine performance.

In contrast, while increasing turbine efficiency and limiting noise emissions are important aspects of turbine operation, they are indirect benefits rather than the primary purpose of the interstage seal. Similarly, aiding in cooling the turbine is not the primary function of this particular seal, as cooling is typically managed through different components and systems designed specifically for temperature management.