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Shrouding the tips of turbine blades

  • A.Increases the tip clearance
  • B.Reduces tip leakage but adds centrifugal load
  • C.Eliminates the need for cooling
  • D.Reduces the blade root stress

Answer: B

A shroud seals the tip and damps vibration, at the cost of mass at the largest radius where centrifugal stress is highest. That trade is why shrouds are common on low pressure turbines and rare on the hottest high pressure stages.

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