What are split shafts used for in gas turbine systems?

In gas turbine systems, split shafts are primarily used for main propulsion. The concept of a split shaft refers to a configuration where the turbine and compressor sections are mechanically independent, allowing for flexibility in operation. This setup enables the gas turbine to drive propulsion systems, such as those found in aircraft and marine applications, where the effective and efficient use of power is crucial.

The design allows the engine to produce thrust while also permitting a portion of the power to be diverted for other functions, such as powering electrical generators or accessories. This versatility is especially important in applications where the demand for propulsion and auxiliary power needs to be balanced, thereby improving overall efficiency and performance.

In contrast, the other options like power generation, fuel delivery, and cooling systems represent specific functions that may involve gas turbines but do not directly connect to the primary purpose of split shafts within a propulsion context.