Discussion
Which of the following is not a nozzle performance coefficient?
Answer: B
Correct answer: Degree of reaction
Degree of reaction is a real and useful quantity, but it belongs to turbine and compressor stage design, describing how the pressure drop or rise is divided between the rotor and the stator. Nozzle performance is described by the coefficients of discharge, velocity and thrust, each comparing an actual quantity with its ideal isentropic value.
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