3.2. The optimum condition of an oscillating water turbine
...The optimum condition which defined as condition of an oscillating turbine with maximum efficiency
was at Reynolds number Re = 50645, the ratio of the longitudinal distance between cylinder and turbine S
to diameter of cylinder D = 10.4, the reduced friction torque T* = 2.7 and the reduced spring stiffness
k* = 0.004.
3.3. The dimensions of full-scale prototype with a cycle-averaged power of 100 W
From dimensional analysis using Buckingham Pi-theorem [4], the non dimensional averaged power is
given by the following relation:
3 2 23 23 P U D f S DT U D k U D / (1/ Re, / , / , / ) U U U (4)
These dimensionless groups and data from laboratory will be used to develop full-scale prototype with a
cycle-averaged power of 100 W using the similarity methods. The prototype was designed to operate
under the following conditions: 1) flow velocity U of 3 m/s and 2) The expected power output of 100 W.
The dimensions of full-scale prototype with a cycle-averaged power of 100 W are listed in Table 2. (also
shown in Fig. 5).