Degree of reaction in an axial-flow compressor: precise definition How is the degree of reaction (R) defined for an axial-flow compressor stage? Choose the correct option.
Mechanical Engineering
Compressors, Gas Dynamics and Gas Turbines
Difficulty: Easy
Choose an option
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AStatic enthalpy rise in rotor to static enthalpy rise in stator
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BStatic enthalpy rise in stator to static enthalpy rise in rotor
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CStatic enthalpy rise in rotor to static enthalpy rise in the stage
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DStatic enthalpy rise in stator to static enthalpy rise in the stage
Answer
Correct Answer: Static enthalpy rise in rotor to static enthalpy rise in the stage
Explanation
Concept/ApproachFor an axial-flow compressor, the degree of reaction is defined as the ratio of static enthalpy rise in the rotor to the static enthalpy rise in the entire stage (rotor + stator). Symbolically, R = (Δhstatic in rotor)/(Δhstatic in stage).
Final AnswerStatic enthalpy rise in rotor to static enthalpy rise in the stage