J0501-1-4 Research on Total Pressure Loss Generation Mechanism in a Half Ducted Propeller Fan

Abstract

Three-dimensional structure of vortical flow fields in a half-ducted propeller fan has been investigated by numerical analysis. Complicated and unsteady flow phenomena in the fan were captured by a detached eddy simulation (DES) based on k-ω two-equation turbulence model. To elucidate the total pressure loss generation mechanism in each vortical flow phenomena, distributions of total pressure loss and absolute vorticity were investigated. Absolute vorticity is useful to separate the flow phenomena which are connected with each other, such as the wake, the tip vortex, and the corner separation. The tip vortex and the concentration of the low energy fluid between the wake and the tip vortex play major roles in the total pressure loss in a half-ducted propeller fan.