涡带工况下轴流泵装置内部脉动特性数值分析

发布时间：2018-04-05 07:08

本文选题：轴流泵　切入点：箱涵式进水流道　出处：《应用基础与工程科学学报》2017年04期

【摘要】：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.
[Abstract]:In order to study the flow field pressure pulsation in vertical axial flow pump device under vortex belt condition, unsteady numerical simulation of vertical axial flow pump device was carried out. The pressure pulsation results at different positions were obtained by setting monitoring points, and the spectrum analysis was carried out.The validity of the numerical results is verified by physical model test and PIV flow field test. The pressure fluctuation characteristics of the impeller inlet and the bottom of the box culvert inlet passage are emphatically analyzed.The results show that the pulsating main frequency of impeller inlet is no longer controlled by axial frequency.The main pulsation frequency of the same monitoring point at the impeller inlet is different under different working conditions.The relative amplitude of impeller inlet pulsation is larger and the main pulsation frequency induced by vortex band is the same as axial frequency.The hydraulic pulsation at the bottom of the box culvert inlet channel is low frequency vortex band pulsation.The main frequency of pulsating pressure at the bottom of the box culvert inlet passage is the same as the axial frequency, the secondary frequency is the same as the blade frequency, and the main frequency of torque variation is the same as the axial frequency of the impeller.
【作者单位】：扬州大学水利与能源动力工程学院;江苏省水利动力工程重点实验室;
【基金】：国家自然科学基金资助项目(51609210) 江苏省自然科学基金资助项目(BK20150457) 中国博士后科学基金资助项目(2016M591932) 流体及动力机械教育部重点实验室开放课题资助项目(szjj2016-078) 江苏高校优势学科建设工程资助项目
【分类号】：TH312;TV136.2

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