Formula for specific speed of turbine

Q.  What is the formula to calculate specific speed (Ns) of a turbine rotating at a speed of 'N' rpm that develops the power of 'P' kW at the heat of 'H' m?
- Published on 16 Sep 15

a. (Ns) = (√N x P) x (H)(5/4)
b. (Ns) = (2 √N x P) x (H)(5/4)
c. (Ns) = (N √P) x (H)(5/4)
d. (Ns) = (2N √P) x (H)(5/4)

ANSWER: (Ns) = (N √P) x (H)(5/4)

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    Discussion

  • Pankaj   -Posted on 12 Oct 15
    The reaction turbines are classified on the basis of specific speed (Ns)

    Specific speed can be defined as the speed of a geometrically similar turbine that would develop unit power under a head on 1 meter.

    The formula for specific speed (Ns) of a turbine rotating at a speed of 'N' rpm that develops the power of 'P' kW at the heat of 'H' m is given by,

    (Ns) = (N √P) x (H)(5/4)

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