On the Kutta condition for the sound transmission through outlet guide vanes

The present work proposes an analytical formulation including a Kutta condition for the acoustic wavescattering by a linear cascade of outlet guide vanes for turbomachinery applications. The Kutta condition has an increasing effect on the structure and on the magnitude of the acoustic response of the cascade as the Mach number of the mean flow is increased. The present analytical approach is believed a consistent alternative to numerical methods, especially at the early design stage. The analytical formulation relies on a mode-matching technique. The methodology is applied in a two-dimensional context and for an oblique acoustic wave. Results, focusing on the radiated acoustic power and the pressure fields, highlight the effect of the Kutta condition for various Mach numbers.