What is the
unsteady to and fro motion of the fluid that causes pulsation in the engine
compressor known as?
Pulsing
Compressing
Choking
Surging
Surging
Surge is defined as
the operating point at which centrifugal compressor peak head
capability and minimum flow limits are reached. Surge occurs when there is
no forward flow of gas through the compressor and a reversal of flow
occurs. The gas that is being compressed gets pushed backward through the
centrifugal compressor. When this surge (flow reversal) occurs,
which can happen in milliseconds, the rotor is affected.
Hence, the
correct option is (D).
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