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In a free vortex turbine design, the degree of reaction

  • A.Is zero everywhere
  • B.Increases from root to tip along the blade
  • C.Is constant along the blade
  • D.Decreases from root to tip

Answer: B

Blade speed rises with radius while the tangential velocity distribution is chosen to keep the work uniform, so the reaction climbs outward. A blade designed for fifty per cent at the mean radius may be close to impulse at the root and highly reactive at the tip.

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