J-Groove による軸流ポンプの不安定性能と吸込み性能の向上 [in Japanese] Improvement of Performance Curve Instability and Suction Performance in Axial flow Pump by New J-Groove [in Japanese]
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In a high specific speed pump, such as a mixed flow or an axial flow pump, the head-capacity curve tends to have a rising characteristic, which is called "performance curve instability". To improve this unstable performance, an innovative technique using shallow grooves mounted on an inner casing wall (called J-Grooves) had been developed. By J-Groove, a performance curve instability of a mixed-flow pump was completely suppressed without dropping the maximum efficiency, but it is still difficult to suppress the instability in an axial flow pump without dropping the maximum efficiency.<br> The present study is aimed to attain complete suppression of the performance curve instability with keeping the maximum efficiency in an axial flow pump, and a new type J-Groove technique was developed using the axial flow pump of specific speed n<sub>s</sub>=2000(min<sup>-1</sup>, m<sup>3</sup>/min, m).
Turbomachinery 35(12), 737-744, 2007-12-10
Turbomachinery Society of Japan