Discussion
Statement I: Cooling air represents a real cycle penalty even though it protects the blades.
Statement II: It has been compressed but is never heated in the combustor.
In the light of the above statements, choose the correct answer.
Answer: B
Both statements are true and the second is the reason. The work spent compressing that fifteen to twenty per cent of core flow is largely wasted, which is why reducing cooling flow is a standing objective in turbine development.
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