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http://dx.doi.org/10.3795/KSME-B.2005.29.7.773

Internal Flow Measurement of Very Low Specific Speed Semi-Open Impeller by PIV  

Nishino Koichi (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. 773-783 More about this Journal
Abstract
Internal flow measurement of very low specific-speed semi-open impellers has been carried out by PIV in order to understand better the internal flow patterns that are responsible fur the unique performance of these centrifugal pumps operating in the range of very low specific speed. Two types of impellers, one equipped with six radial blades (Impeller A) and the other with four conventional backward-swept blades (Impeller B), are tested in a centrifugal pump operating at a non-dimensional specific-speed of $n_s=0.24$. Complex flow patterns captured by PIV are discussed in conjunction with the overall pump performance measured separately. It is revealed that Impeller A achieves higher effective head than Impeller B even though the flow patterns in Impeller A are more complex, exhibiting secondary flows and reverse flows in the impeller passage. It is shown that both the localized strong outward flow at the pressure side of each blade outlet and the strong outward through-flow along the suction side of each blade are responsible for the better head performance of Impeller A.
Keywords
Internal Flow Measurement; PIV; Semi-Open Impeller; Very Low Specific-Speed;
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