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为研究涡带工况时立式轴流泵装置内部流场压力脉动情况,开展了立式轴流泵装置非定常数值模拟,通过设置监测点,获得了不同位置的压力脉动结果,并进行了频谱分析.通过物理模型试验及PIV流场测试技术验证了数值计算结果的有效性,重点分析了叶轮进口及箱涵式进水流道底部的压力脉动特性.研究结果表明,涡带工况时叶轮进口的脉动主频已不再受轴频控制.不同工况时叶轮进口的相同监测点的脉动主频存在差异性.大流量工况时叶轮进口的脉动相对幅值较大,且涡带诱发的脉动主频与轴频相同.各工况时箱涵式进水流道底部水力脉动均为低频涡带脉动.在大流量工况时,箱涵式进水流道底部的脉动压力主频与轴频相同,次主频与叶频相同,扭矩变化主频与叶轮的轴频相同.
In order to study the pressure fluctuation in the vertical axial-flow pump device, the unsteady numerical simulation of the vertical axial-flow pump device was carried out. By setting the monitoring points, the pressure pulsation results at different positions were obtained, Spectrum analysis.The validity of the numerical results is verified by physical model test and PIV flow field test.The stress pulsation characteristics at the inlet of the impeller and at the bottom of the box culvert inlet are analyzed emphatically.The results show that the impeller The main frequency of the imported pulsation is no longer controlled by the axial frequency.The pulsating frequency of the same monitoring point of the impeller is different under different working conditions.The relative amplitude of the pulsation of the impeller at large flow rate is relatively large and the vortex induced Of the pulsating frequency and the same axis frequency .Charter flow culvert at the bottom of the case of hydraulic pulsation are low-frequency vortex pulsation.In the large flow conditions, the bottom of the box culvert inflow channel pulsation frequency and the shaft The same frequency, sub-frequency and leaf frequency the same, the main frequency of torque changes with the same impeller axis frequency.