FAA Powerplant Written Practice Test

Which component acts as a diffuser in a turbine engine and converts velocity to pressure?

1. Compressor blades

2. Combustion chamber

3. Stators

4. Exhaust nozzle

The correct answer is: Stators

In a turbine engine, the component that acts as a diffuser and converts velocity to pressure is the stators. The stators are stationary blades located in the bypass or flow path of the engine. When the high-velocity airflow generated by the compressor blades passes over the stators, the shape and design of the stators slow down the airflow, which leads to an increase in pressure. This process is crucial because it helps to manage the flow of air entering the combustion chamber, ensuring efficient mixing with fuel and optimal combustion. The role of stators in this process is integral to the overall functioning of turbine engines, as increased pressure helps maintain the necessary conditions for combustion and propulsion. Understanding the function of stators in increasing pressure while reducing velocity is essential in thermal dynamics and fluid mechanics as they apply to engine design and operation.