Reaction turbine - Runner needs to be run full of water

Q.  In which type of turbine, the runner needs to be run full of water?
- Published on 16 Sep 15

a. Impulse turbine
b. Reaction turbine
c. Both a. and b.
d. None of the above

ANSWER: Reaction turbine

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    Discussion

  • Pankaj   -Posted on 12 Oct 15
    Reaction turbine does not operate at the atmospheric pressure. The runner of the reaction turbine is always under pressure. The draft tube is used to discharge the water passing over the runner blades to the tail race. The small end of draft is connected to outer opening of the casing and its bigger end is deeply submerged into the tail race by around 1 m depth from rail race level. Draft tube increases the pressure head.

    Therefore, for better operation of reaction turbine and to improve its efficiency, the runner of reaction turbine needs to be run full of water.

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