Blade geometry in a Parsons reaction turbine For a Parsons (≈50% reaction) turbine stage, determine the relation between fixed (stator) and moving (rotor) blade shapes. Choose the correct option.
Mechanical Engineering
Steam Nozzles and Turbines
Difficulty: Easy
Choose an option
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AOnly moving blades are present
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BOnly fixed blades are present
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CFixed and moving blades are identical (conjugate shapes)
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DFixed and moving blades have different shapes
Answer
Correct Answer: Fixed and moving blades are identical (conjugate shapes)
Explanation
ConceptIn a Parsons reaction stage (degree of reaction ≈ 0.5), the fixed and moving blade passages are designed to be geometrically similar so that pressure drop and acceleration are shared equally.
Final AnswerFixed and moving blades are identical (conjugate shapes)