What is degree of reaction?

Q.  ___________ can be defined as the ratio of the pressure rise in rotor blades to the pressure rise in stages in an axial flow compressor.
- Published on 16 Sep 15

a. Degree of pressure
b. Degree of reaction
c. Pressure ratio
d. Reaction ratio

ANSWER: Degree of reaction

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    Discussion

  • Pankaj   -Posted on 16 Oct 15
    Degree of reaction can be defined as the ratio of the pressure rise in rotor blades to the pressure rise in stages. It is applied to an axial flow compressors.

    Therefore,

    Degree of reaction, R = (Pressure rise in rotor blades) / (Pressure rise in stages)

    But,

    The pressure rise in rotor = ((Cri)2 – (Cro)2) / 2

    The pressure rise in stater = ((Co)2 – (Ci)2) / 2

    and,

    Total pressure rise in stage,

    Δp = (Cwo – Cwi) x Cb


    ∴ Degree of reaction, R = [((Cri)2 – (Cro)2) / 2] / [(Cwo – Cwi) x Cb]

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