The flow in a Kaplan model turbine developed for a wave energy converter with the specific speed of 260rpm has been investigated experimentally and numerically. The operating performance show good results for all runner and inlet geometries which have been investigated. Further, the performance of the siphon type turbine has been investigated during the transient start and stop operation. With the determination of the defining parameters, the performance of the turbine can be predicted in model and prototype scale. The results of the numerical investigation of the global turbine performance agree with the experimental data. Although, the best efficiency correlation of the runner blade angle and the guide vane angle could not be reproduced. Detailed investigations show, that the discrepancies derive from an underestimate of the swirl produced by the guide vanes. Using a similarity law based function, the numerical results can be corrected.
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The flow in a Kaplan model turbine developed for a wave energy converter with the specific speed of 260rpm has been investigated experimentally and numerically. The operating performance show good results for all runner and inlet geometries which have been investigated. Further, the performance of the siphon type turbine has been investigated during the transient start and stop operation. With the determination of the defining parameters, the performance of the turbine can be predicted in model...
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