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A convergent-divergent nozzle designed by the method of characteristics differs from a simple conical nozzle in that it

  • A.Operates without choking
  • B.Produces a lower exit Mach number
  • C.Produces parallel exit flow, avoiding divergence loss
  • D.Requires no throat

Answer: C

A conical nozzle leaves the flow spreading radially, so only the axial component contributes to thrust and a divergence loss results. A contoured bell shaped by characteristics turns the flow back parallel to the axis before it leaves, recovering most of that loss for a modest gain in weight.

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