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http://dx.doi.org/10.5293/KFMA.2006.9.1.009

A Study on the Internal Flow Characteristics of a Very Low Specific Speed Centrifugal Pump by PTV  

Choi, Young-Do (요코하마국립대학 대학원)
Matsui, Jun (요코하마국립대학 대학원)
Kurokawa, Junichi (요코하마국립대학 대학원)
Lee, Young-Ho (한국해양대학교 기계정보공학부)
Publication Information
The KSFM Journal of Fluid Machinery / v.9, no.1, 2006 , pp. 9-18 More about this Journal
Abstract
In the range of very low specific speed ($n_s<0.25$, non-dimensional), the performance of a centrifugal pump is much different from that of a centrifugal pump of normal ns and the efficiency of the pump drops rapidly with the decrease of $n_s$. In order to examine the reason of unstable performance characteristics of the very low $n_s$- centrifugal pump, the internal flow of the pump with a semi-open impeller is measured by a PTV(Particle Tracking Velocimetry) system. The purpose of this study is to make clear the internal flow characteristics and to obtain basic knowledge of the pump performance. The results show that the leakage flow through tip clearance give a strong effect on the flow pattern of impeller passage. A large vortex in the impeller passage and a strong reverse flow at impeller outlet are formed in the range of small flow rates, and the vortex and the reverse flow together reduce the absolute tangential velocity at the impeller outlet and cause the performance instability.
Keywords
Centrifugal pump; Internal flow; Semi-open impeller; Very low specific speed; PTV;
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