フランシス水車の模型効率換算式について

概要

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It is the well known phenomena that the efficiency of full scale water turbine is better than that of model. And it has been considered as such only because of the difference of friction losses between full scale and model, by their difference of Reynolds' number. The author, considering the discrepancy of velocity diagrams between full scale and model, owing efficiency difference, and to arrange this difference to the efficiency calculation formula, deduced a new formula to calculate the loss independent of Reynolds' number. By this formula, considering also the difference of friction loss, the author presents a new type efficincy calculation formula of Francis water turbines by their model efficiency. It is applicable to the case of partial load, and involve the deviation of maximum efficiency condition between full scale and model. The several actual experimental results in Japan coincide closely with calculated full scale efficiency by above formula.
一般社団法人日本機械学会の論文