Reaction turbines: source of axial thrust Given causes: (a) Pressure drop across the rotor (b) Change in axial component of velocity Select the correct cause(s) of axial thrust.
Mechanical Engineering
Steam Nozzles and Turbines
Difficulty: Easy
Choose an option
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APressure drop across the rotor only
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BChange in axial velocity only
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CBoth (a) and (b)
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DNone of these
Answer
Correct Answer: Both (a) and (b)
Explanation
Concept/Approach
- In a reaction turbine, static pressure drops across both stator and rotor; a net pressure force acts on rotor disks in the axial direction.
- Additionally, a change in axial momentum (axial velocity component) across the rotor produces axial thrust.
Final AnswerBoth (a) and (b)