著者
松下 兼次
出版者
鹿児島大学
雑誌
鹿児島大学工学部研究報告 (ISSN:0451212X)
巻号頁・発行日
no.14, pp.7-9, 1972-11

It is known that the head of a centrifugal pump slightly increases when the roughnessincreases on the outer surface of the impeller of a centrifugal pump.The authors report the results about a volute pump that by measuring the velocitydistribution in the axial direction in the inlet of the casing. (namely, immediately afterthe water ran out the impeller.)We examined the relation between the velocity distribution and the head rise.
著者
松下 兼次 マツシタ カネツグ MATSUSHITA Kanetsugu
出版者
鹿児島大学
雑誌
鹿児島大学工学部研究報告 (ISSN:0451212X)
巻号頁・発行日
no.5, pp.45-49, 1965-09

The author performed his experiments, in order to know the special characteristics of centrifugal pumps, with an 1 stage volute pump of 3" diameter, changing the shapes of cross section of suction nozzles and varying the roughness of outer surface of impeller, and he examined the influence of those variables on the efliciency of pumps. The results obtained are as follows:Shapes of cross section of suction nozzles:Those which conformed to the shapes of impeller suction inlets reveald best in efficiency. The outer surface of impeller:As the roughness increased, the pump efficiency was decreased since the increase of disk friction loss was accompanied by the influence of the flow within the space between the impeller and its casing, while the total head was seen somewhat increased.