Abstract
This paper describes some hydrodynamic mechanisms of PBCF (Propeller Boss Cap Fins) behind a propeller derived by computational fluid-dynamics method (Finite Volume method).Ouchi1) makes it appear that in his experimental method (inverted propeller open test), more effective propeller performances by installing PBCF are obtained. It is the fact that thrust of propeller system with PBCF is higher and torque is lower than without PBCF, as a result, efficiency of propeller with PBCF is higher than without PBCF. Unfortunately, as it is very difficult to obtain effective quantities showing physical phenomena as velocity, pressure, and vorticity, because of a propeller as rotational wings, the detailed information in order to explain the mechanisms cannot be investigated in the experiments easily.The purpose of this paper is to clear the hydrodynamics mechanisms of PBCF shown by 3 kinds of experimental results (higher pressure on boss cap, higher thrust working on blade and against torque working on PBCF). As a result, we obtain that increased pressure around boss cap by damming flow before PBCF will prevent generation of hub vortex.
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