Interaction Effects between Blade Rows in Turbomachines

Abstract

The paper discusses the mechanisms of interaction between blade rows in turbomachines due to the relative motion between the rows. Interaction occurs due to potential flow effects and because each blade produces a viscous wake. In spite of extensive investigations of various aspects of interaction there is very little information available in a form which can be applied by a designer to minimize the noise and vibration excitation due to blade row interaction. Experimental research is hampered by the extreme difficulty of separating the types of excitation and many theoretical analyses are of limited value because reliable experimental verification has not been obtained.