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At what speeds will the low pressure compressor run on a triple spool engine?

  • A

    Different speed to the LP turbine.

  • B

    The same speed as the HP turbine.

  • C

    The same speed as the HP compressor.

  • D

    Different speeds to the HP compressor, IP turbine.

Refer to figure.
A 3-spool engine is one that has three sets of compressors before the combustor and three sets of turbines behind it. The following shall be expected:

  • A fan (LP compressor) and LP turbine on the same shaft, and will, therefore, run at the same speed.
  • An Intermediate compressor (IP) and an Intermediate turbine (IP) which are on the same shaft and run at the same speed.
  • A HP compressor and a HP turbine on the same shaft, and will, therefore, run at the same speed.

Therefore LP compressor runs at different speeds compared to IP turbine and HP compressor.

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