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Impulse reaction turbine?

  1. Apr 21, 2014 #1
    I have seen modern steam turbines with velocity compounding, they start with impulse stage then reaction stages,can any one tell me, why There is a impulse stage first,why not a reaction stage first???
  2. jcsd
  3. Apr 21, 2014 #2


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    When steam is first admitted into the turbine casing, it is traveling at relatively low velocity. The impulse stages are placed first on the turbine rotor so that the steam expanding thru them will increase in velocity, after which reaction stages can be used to take advantage of the now faster flowing steam.
  4. Apr 22, 2014 #3
    Doesn't nozzle drop steam pressure and increase its velocity upto super sonic level?
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