What is the function of turbine nozzles in a jet engine?

The function of turbine nozzles in a jet engine is to prepare the mass airflow for driving the turbine rotor. This is achieved by converting the high-energy, high-temperature gas exiting the combustion chamber into a high-velocity jet of gas. The nozzles are designed to optimize the flow of gases, directing them towards the turbine blades at the correct angle and with the appropriate velocity. As the gas expands and accelerates through the nozzle, it imparts kinetic energy to the turbine rotor, causing it to spin and drive the engine components.

This process is crucial for the efficient operation of the engine and ensures that the energy extracted from the combustion process is effectively utilized to produce thrust or drive other systems such as compressors. In this context, the design and function of the turbine nozzles are integral to maximizing engine performance and efficiency.