What are the two basic elements of an axial-flow turbine section in a turbine engine?

What are the two basic elements of an axial-flow turbine section in a turbine engine?

• A. Rotor and stator
• B. Rotor and blade
• C. Stator and hub
• D. Rotor and casing

Answer: (A)

In an axial-flow turbine section, energy transfer relies on two parts working together: the rotor and the stator. The rotor is the rotating part attached to the turbine shaft and carries the moving blades; as the hot gas expands through these blades, momentum is transferred to the rotor, turning the shaft and producing mechanical work. The stator is fixed and consists of vane assemblies that guide and shape the gas flow into the rotor with the right direction and speed, ensuring efficient energy extraction for each stage. This pairing—a rotating blade row and a stationary vane row—is the fundamental setup of axial-flow turbines. The other components (like hub or casing) are structural parts, and blades are part of the rotor, not a separate basic element.

In an axial-flow turbine section, energy transfer relies on two parts working together: the rotor and the stator. The rotor is the rotating part attached to the turbine shaft and carries the moving blades; as the hot gas expands through these blades, momentum is transferred to the rotor, turning the shaft and producing mechanical work. The stator is fixed and consists of vane assemblies that guide and shape the gas flow into the rotor with the right direction and speed, ensuring efficient energy extraction for each stage. This pairing—a rotating blade row and a stationary vane row—is the fundamental setup of axial-flow turbines. The other components (like hub or casing) are structural parts, and blades are part of the rotor, not a separate basic element.