Study of Rudder Drag in Propeller Slipstream Using Segmented Model Rudder

Kanemaru, Takashi, Yoshitake, Akira, Ando, Jun

It is very important to estimate the interaction between propeller and rudder because a rudder in the propeller slipstream generates thrust. It is possible to predict the energy-saving effect by numerical methods such as theoretical calculation based on potential flow theory or CFD, qualitatively. However, the partial rudder drag just behind the boss cap is difficult to simulate since the interaction between a hub vortex and the rudder surface is very complicated. In the case of potential flow theory, the partial force on the center of the rudder can be either drag or thrust, depending on how the hub vortex is treated. / This paper focuses on the partial rudder drag in order to clear not only the total rudder drag but also how the hub vortex interacts with the rudder. Knowing these phenomena is very important to check the validity of numerical methods. The authors conducted an experiment on the interaction between propeller and rudder using the segmented model rudder. The rudder is divided into three parts, upper, center, and lower part. The experimental results show that the rudder thrust is largest at the center part. Also, the experimental results are compared to the calculated results in order to validate both of them.

Study of Rudder Drag in Propeller Slipstream Using Segmented Model Rudder

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