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      검색키워드
      저자 : Masao Oshima (검색결과 3 건)
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      • SCOPUSKCI등재

        Efficiency Increase and Input Power Decrease of Converted Prototype Pump Performance

        Oshima, Masao Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.3

        The performance of a prototype pump converted from that of its model pump shows an increase in efficiency brought about by a decrease in friction loss. As the friction force working on impeller blades causes partial peripheral motion on the outlet flow from the impeller, the increase in the prototype's efficiency causes also a decrease in its input power. This paper discusses results of analyses on the behavior of the theoretical head or input power of a prototype pump. The equation of friction-drag coefficient for a flat plate was applied for the analysis of hydraulic loss in impeller blade passages. It was revealed that the friction-drag of a flat plate could be, to a certain degree, substituted for the friction drag of impeller blades, i.e. as a means for analyzing the relationship between a prototype pump's efficiency increase and input power decrease.

      • KCI등재

        Efficiency Increase and Input Power Decrease of Converted Prototype Pump Performance

        Masao Oshima 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.3

        The performance of a prototype pump converted from that of its model pump shows an increase in efficiency brought about by a decrease in friction loss. As the friction force working on impeller blades causes partial peripheral motion on the outlet flow from the impeller, the increase in the prototype’s efficiency causes also a decrease in its input power. This paper discusses results of analyses on the behavior of the theoretical head or input power of a prototype pump. The equation of friction-drag coefficient for a flat plate was applied for the analysis of hydraulic loss in impeller blade passages. It was revealed that the friction-drag of a flat plate could be, to a certain degree, substituted for the friction drag of impeller blades, i.e. as a means for analyzing the relationship between a prototype pump’s efficiency increase and input power decrease.

      • SCOPUSKCI등재

        A Study on Performance Conversion from Model to Prototype

        Masao Oshima 한국유체기계학회 2010 International journal of fluid machinery and syste Vol.3 No.3

        A prototype pump performance converted from that of a model pump shows an increase in efficiency. This paper discusses whether such increase is related to an increase in pump head and/or to a decrease in input power, based on the relationship between the tangential force on impeller blades, head loss and input power. This study revealed that the efficiency increase was brought about not only by an increase in head, but also by a decrease in input power, as the tangential force on the blades constitutes a part of the input power of a pump. A solution is proposed on how the hydraulic efficiency increase of a prototype pump should be related to its head and input power.

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