ASA Turbine engines

What is the purpose of the stators in an axial flow compressor?

The stators convert some velocity energy into pressure energy and change the direction of the air so it's proper for the next stage of rotors.

What is the main purpose of the turbine nozzle in an aircraft turbine engine?

The turbine nozzle directs the hot gases as they leave the combustors so they will turn the turbine wheel with maximum efficiency.

Why do some axial-flow turbine engines have more than one set of turbines and compressors?

A two-spool engine has a low-pressure and a high-pressure compressor, each driven by its own turbine. The two independent systems operate at the speed at which they are most efficient.

What is meant by a free turbine turboshaft engine?

A turboshaft engine that has a turbine wheel or stage of turbine wheels that is not used to drive the compressor of the gas generator section. This free turbine drives the propeller (turboprop) or the transmission and rotor (helicopter).

What is meant by trimming a turbojet engine?

Adjusting the fuel control to the correct idling and maximum thrust RPM.

Where is water injected in a turbine engine for cooling purposes?

Into the compressor inlet and into the engine diffuser case.