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http://dx.doi.org/10.3795/KSME-B.2005.29.7.784

A Study on the Performance and Internal Flow Characteristics of a Very Low Specific Speed Centrifugal Pump  

Kurokawa Junichi (요코하마국립대학 대학원 공학연구원)
Lee Young-Ho (한국해양대학교 기계)
Choi Young-Do (요코하마국립대학 대학원 공학연구원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.7, 2005 , pp. 784-794 More about this Journal
Abstract
In the very low specific speed range ($n_s=0.24$ < 0.25, non-dimensional), the efficiency of centrifugal pump designed by a conventional method is very low in common. Therefore, positive-displacement pumps have long been used widely. Recently, since the centrifugal pumps are becoming higher in rotational speed and smaller in size, there expects to develop a new centrifugal pump with a high performance to replace the positive-displacement pumps. The purpose of this study is to investigate the internal flow characteristics of a very low specific speed centrifugal pump and to examine the effect of internal flow pattern on pump performance. The results show that the theoretical head definition of semi-open impeller should be revised by the consideration of high slip factor in the semi-open impeller, and the leakage flow through the tip clearance results in a large effect on the impeller internal flow. Strong reverse flow at the outlet of semi-open impeller reduces the absolute tangential velocity considerably, and the decreased absolute tangential velocity increasese the slip factor with the reduction of theoretical head.
Keywords
Centrifugal Pump; Internal Flow; Performance; Semi-open Impeller; Very Low Specific Speed;
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  • Reference
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