二重翼列形式遠心羽根車の研究

概要

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Although studies on pump cavitation performance have been made by many researchers, it seems difficult to get suction specific speed of more than S = 2 000 (m, m^3/min, rpm) without lowering pump efficiency. In this paper, a new type centrifugal impeller with tandem blade rows is suggested. This impeller consists of a front blade row and a main blade row : the former has three vanes and operates as an inducer, and the latter has six vanes and takes part of pump operation. Tested pump is of centrifugal type with Ns=215. Its pump and cavitation charateristics were investigated at various relative positions of the two blade rows in peripheral direction and pressure distributions in the impeller were measured. Moreover, flow in the impeller was analyzed theoretically by using singularity method. As the result, it was found that its cavitation performance was considerablly improved without lowering pump efficiency and S=2900 was obtained.
一般社団法人日本機械学会の論文
1983-12-25