カプラン水車の模型効率換算式について

概要

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A new formula for the case of Kaplan water turbines was obtained by the considerations, which are analogous to the author's former formula for the case of propeller type water turbines. Only one point of difference between the propeller and Kaplan type's case is the exponent of q=Q/Q_0. The former case is 1,the latter case is 1/2. Where, Q_0 is the water quantity at maximum efficiency. By courtesy of Factory Hitachi, comparing the full scale experimented efficiency of Kaplan turbine of the River Nippashi with the calculated efficiency by the formula for the case of Kaplan, ascertained close agreement to each other. Putting together, the author's former formulae, for the case of Francis, propeller type and this case of Kaplan water turbines, only one formula was obtained. By this formula, taking different exponent, full scale efficiency of all practical types of water turbines are calculated by their model experimented efficiency.
一般社団法人日本機械学会の論文