Stage efficiency relation: combining nozzle and blade efficiencies Given nozzle efficiency (ηN) and blading efficiency (ηB), express the stage efficiency (ηS). Choose the correct option.
Mechanical Engineering
Steam Nozzles and Turbines
Difficulty: Easy
Choose an option
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Aη<sub>S</sub> = η<sub>B</sub> × η<sub>N</sub>
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Bη<sub>S</sub> = η<sub>B</sub>/η<sub>N</sub>
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Cη<sub>S</sub> = η<sub>N</sub>/η<sub>B</sub>
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DNone of these
Answer
Correct Answer: η<sub>S</sub> = η<sub>B</sub> × η<sub>N</sub>
Explanation
ConceptStage efficiency reflects cumulative losses in both the nozzle and the moving blades. Assuming the losses are independent, the overall (stage) efficiency is the product:
ηS = ηN × ηB
Final AnswerηS = ηB × ηN