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Pressure loss through a combustor can be reduced to zero by careful design. Is this correct?

  • A.No, the dilution jets must penetrate the flow to mix
  • B.Yes, with sufficiently smooth ducting
  • C.Yes, at cruise conditions only
  • D.No, because pressure loss is desirable

Answer: A

Jets need momentum to penetrate and mix, and that momentum is bought with total pressure. The design balances mixing quality against the pressure it costs, which is why three to six per cent is typical rather than any smaller figure.

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