Cavitating flow-induced unsteady pressure pulsations in a low specific speed centrifugal pump.

At this stage, a large area of the blade leading region is occupied by cavitation bubbles, so the corresponding pump head drops rapidly. As presented in figure 7 for point In1 close to the cavitation region, the pressure amplitude shows a decreasing trend at cavitation numbers of σ = 0.15 to σ = 0.104; then the pressure amplitude increases from cavitation number σ = 0.104 to full cavitation σ = 0.088.

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It is noted that, for 1.4 Q d , before the inflection point, the pressure amplitude exhibits an increasing trend from cavitation number σ = 0.246 to σ = 0.199.

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