It is thought that small hydropower
generation is alternative energy, and the energy potential of small hydropower
is large. The efficiency of small hydro turbines is lower than that of large
one, and these small hydro turbine’s common problems are out of operation by
foreign materials. Then, there are demands for small hydro turbines to keep
high per- formance and wide flow passage.
Therefore, we adopted contra-rotating rotors which can be expected to achieve
high performance and low-solidity rotors with wide flow passage in order to
accomplish high performance and stable opera- tion. Final goal on this study is development of an
electric appliance type small hydro turbine which has high portability and
makes an effective use of the unused small hydro power energy source. In the
present paper, the performance and the internal flow conditions in detail of
contra-rotating small-sized axial flow hydro turbine are shown as a first step
of the research with the numerical flow analysis. Then, a capability adopting
contra-rotating rotors to an electric appliance type small hydro turbine was
discussed. Furthermore, the high performance design for it was considered by
the numeri- cal analysis results.
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