2020 Volume 8 Issue 1 Pages 118-125
To develop the high performance water turbine for the small hydroelectric power generator, we suggest the some flow guides set inside the straight Darrieus water turbine. The guides shape the cylindrical or ellipsoidal column. When the tip speed ratio λ is below 1.0, the power coefficient CP of the water turbine with the cylindrical or ellipsoidal guide is larger than that of the turbine without any guides. Then the cylindrical guide shows the highest CP and the ellipsoidal guides which be set the suitable angle shows comparable CP to that of the cylindrical guide. When the λ is above 1.0, the CP of the turbine with cylindrical guide is smaller than that of the turbine without any guides. Then the CP of the turbine with the ellipsoidal guides which have the suitable oblateness and be set the suitable mounting angle are larger than that of the turbine without any guides. Hence, the ellipsoidal guides will be able to rise the CP in wide range of λ.
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