Physical modeling the unsteady flow with wakes

Abstract

The flow through blade channels in turbomachinery is unsteady due to wake from the blade rings placed upstream. The hesitating cylinder and squirrel cage are the most spread generators for modeling the unsteady flow with wakes. This paper is aimed at the comparison of characteristics of hydrodynamic structure of external flow for two different wake generators. The special attention is focused on development of the methods for dividing of the total longitudinal pulsation into turbulent and nonstationary components and averaging of hydrodynamic external flow characteristics with periodic nonstationarity by replacement of such a flow with shearless equivalent.