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Turbine blade tip clearance matters because

  • A.Gas leaks over the tip doing no work
  • B.The tips would otherwise overheat
  • C.Clearance sets the blade natural frequency
  • D.It determines the cooling air flow

Answer: A

Leakage over the tip bypasses the blade passage entirely and mixes destructively with the main flow. Active clearance control, which cools the casing to shrink it onto the tips in cruise, exists to recover exactly this loss.

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