EASA Gas Turbine Engine Practice Test

The turbine rotor blade pressure change is best described by which statement?

Increases, temperature increases, velocity decreases. Decreases, temperature and velocity decreases. Remains constant, temperature increases. Increases, temperature decreases, velocity increases.

Correct Answer:

Decreases, temperature and velocity decreases.

Explanation:

The main idea is that a turbine rotor blade extracts energy from the hot gas as it passes, so the gas slows down, cools, and its pressure drops as it expands doing work on the blades. As the gas expands across the blade row, it performs work on the blades, which lowers its enthalpy.With adiabatic conditions, a decrease in enthalpy means a drop in temperature, so the static temperature falls. The blade also redirects and decelerates the flow in the magnitude sense because energy is being removed to generate shaft power, so the gas velocity decreases through the passage. The pressure falls as the gas expands and loses energy to the rotor. So the description that best fits is a decrease in pressure, accompanied by decreases in temperature and velocity across the rotor blade.

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