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Combustion efficiency is the parameter that best separates modern combustor designs at cruise. Is this correct?

  • A.No, every serious design exceeds ninety nine per cent there
  • B.Yes, efficiencies vary widely between designs
  • C.Yes, provided the engine is at idle
  • D.No, because efficiency cannot be measured

Answer: A

Correct answer: No, every serious design exceeds ninety nine per cent there

With all designs above 99 per cent, the differences lie in the last fraction of a per cent and are lost in measurement scatter, so the parameter ranks nothing. It is an essential requirement rather than a discriminator, and the real comparisons are made on pressure loss, pattern factor, stability and emissions.

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