air stream blocking the passage

motion of air at sonic velocity

unsteady, periodic and reversed flow

air stream not able to follow the blade contour

mass flow rate

pressure ratio

change in load

stagnation pressure at the outlet

pressure ratio

pressure coefficient

degree of reaction

slip factor

centrifugal pump

reciprocating pump

turbine

sliding vane compressor

larger air handling ability per unit frontal area

higher pressure ratio per stage

aerofoil blades are used

higher average velocities