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This paper presents the results of a numerical investigation on the flow field and the fluid force acting on a yawing blade of a new type waterwheel in unidirectional flow. Because the performance of the waterwheel heavily depends on the behavior of the spring-supported blades, we examined the effects of the spring stiffness coefficient and the rotational speed of waterwheel on the torque magnitude. Flow was simulated by solving the unsteady Navier-Stokes equations, in the Arbitrary Lagrangian-Eulerian formulation. Descriptions are given of the interaction between the viscous fluid and the blade. The results indicate that properly controlling of the spring coefficient is important o get a larger net force during one rotation. The net force becomes large when the wheel rotates at a speed of about 0.4 times as fast as the velocity of the main flow. Fairly good agreements have been obtained between the numerical results and the experimental for the relationship between the net force and the rotational speed.

NUMERICAL SIMULATION OF COUPLING MOTION BETWEEN BLADE AND FLUID FOR THE WATERWHEEL WITH YAWING BLADES