An Improvement of Performance-Curve Instability in an Axial Flow Pump by Use of J-Grooves

概要

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In case of a high specific speed pump such as a mixed flow or an axial flow pump, the possibility of the occurrence of the unstable performance characteristic curve tend to increase. To improve this unstable performance of the axial flow pump with a high specific speed of 2100 (rpm, m<SUP>3</SUP>/min, m), an innovative technique using shallow grooves formed on the inner casing wall is studied. The effect of the groove configuration on the performance curve, the efficiency and the NPSHR are investigated experimentally. A numerical simulation using CFD code is carried out to investigate the inlet recirculation flow region and swirl strength with or without grooves at the low flow rate which cause the instability of the performance curve. The effectiveness of the grooves is described and confirmed.
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