What is the main purpose of the turbine section in a gas turbine engine?

The turbine section of a gas turbine engine is critically important as it is designed to extract energy from the hot gases produced during combustion. The high-temperature, high-pressure exhaust gases that flow through the turbine section have already expanded after passing through the combustion chamber and are directed through the turbine blades. The energy extracted from these gases is used to drive the compressor and other accessories, sustaining the engine's operation and contributing to its overall efficiency.

By converting thermal energy into mechanical work, the turbine transforms the potential energy of the exhaust into useful work that powers the engine's various components. This process is essential for maintaining momentum within the engine cycle, as it allows the engine to continue compressing air and burning fuel without an external energy source. Thus, understanding the function of the turbine section is key in recognizing how gas turbine engines generate thrust and maintain continuous operation.