Question 73Gas Turbine - Assistant Engineer

The correct answer is D) Surge. Surge is the term used to describe the condition in which cyclic pressure changes result in a repetitive failure and recovery of compressor air flow. This occurs when the compressor experiences an aerodynamic instability, causing the air flow to momentarily reverse direction and then recover. This cyclic process can lead to excessive vibrations and damage to the compressor. The other options are incorrect: A) Laminar - Laminar flow refers to smooth, orderly flow, which is the opposite of the disruptive flow pattern associated with surge. B) Turbulence - Turbulence is a different flow condition characterized by chaotic, irregular flow, but does not specifically describe the cyclic flow reversal of surge. C) Stall - Stall refers to the loss of lift on an airfoil, which is a different phenomenon from the compressor flow reversal of surge.