Question 71Gas Turbine - Assistant Engineer

The correct answer is C) The angle at which the air strikes the compressor rotor blades is too high. Compressor stall occurs when the angle of the air entering the compressor blades is too high, disrupting the smooth airflow and causing the compressor to lose efficiency. When the angle of attack becomes too steep, the air flow separates from the blade surface, leading to a localized stall that can propagate through the compressor stages, ultimately causing the entire compressor to stall. The other options are incorrect because: A) This describes a problem with the airflow over the turbine section, not the compressor. B) The angle of the hot gases striking the turbine blades is not a cause of compressor stall. D) An angle that is too low would not cause compressor stall, as the airflow would remain attached to the blades.