極低比速度渦巻ポンプの最適形状の探求

概要

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Pump efficiency drops rapidly with a decrease in specific speed n_s in the very low n_s range. In order to improve a pump efficiency and to establish the optimum design method of a volute pump of very low specific speed around n_s=60～70[m, m^3/min, rpm], several combinations of centrifugal impeller and volute casing were tested. The results showed that the maximum efficiency is largely influenced by the volute design parameters, such as a volute tongue, a volute width and a gap between the impeller exit and the volute tongue, while the maximum efficiency differs little by the design of impeller. The BEP of a very low n_s pump agrees well with the designed discharge of a volute and is far form that of an impeller. With a decrease in the space between an impeller and a volute-tongue, the pump efficiency increases, and the pressure fluctuation due to interference does not increase, which is quite different from usual n_s pumps.
社団法人日本機械学会の論文
2000-04-25