《Tab.2 Average error in numerical simulation of different turbulence models under small flow conditi

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《基于FBM模型的轴流泵空化流动特性CFD分析》

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Two specific cavitation condition points were analyzed，and the numerical simulation B（NPSH=5.25m）and D（NPSH=3.72 m）conditions were compared with the corresponding experimental condition points，as shown in Table 3.It can be seen from the Table 3that the efficiency error in the initial stage of cavitation was 0.94%，and the efficiency error in the severe cavitation condition was 7.65%，respectively.Under the severe cavitation condition，the internal flow state of axial flow pump was extremely complex，and the occurrence of cavitation had great randomness.Therefore，the results of numerical simulation were quite different from the experimental results，but the errors of these two operating points were in a reasonable range.Compare the cavitation diagram in the runner under B and D conditions with the experimental diagram，and the volume fraction of the cavitation is shown in Fig.5.According to the Fig.5above 0.1.It can be seen from the figure that the cavitationdistribution diagram simulated by the numerical calculation was generally consistent with the photos taken by the experiment，which showed that the two cavitation conditions calculated by the numerical calculation could accurately simulate the cavitation distribution in the axial flow pump.