立式轴流泵装置进水流道出口流态与脉动试验分析

发布时间：2018-07-08 21:14

本文选题：轴流泵装置 + 进水流道　；参考：《农业机械学报》2017年12期

【摘要】：进水流道出口流态是影响立式轴流泵装置运行稳定性的关键因素之一,基于立式轴流泵装置整体物理模型,采用在肘形进水流道出口段壁面布置丝状红线和压力脉动传感器,研究分析了不同转速时立式轴流泵装置肘形进水流道出口段的流态及压力脉动变化规律。结果表明,当流量小于0.7Qbep时肘形进水流道出口段内壁面的丝线偏移方向与叶轮旋转方向相同,各测点的脉动幅值均随转速的增加而增加;当流量大于0.7Qbep时肘形进水流道出口段内壁面的丝线偏移方向与泵轴方向相同,各测点的脉动幅值随转速的增加而减小。相同转速时,各测点的脉动幅值随流量的增大先减小后增大,在最优工况时脉动幅值最小。不同转速下,流道出口各测点的脉动主频均为4倍转频,最优工况时各测点的脉动次主频均为1倍转频。随转速增加,肘形进水流道出口段各测点主频幅值的增幅存在差异性,小流量工况时各测点的脉动主频幅值增幅小于最优工况和大流量工况。
[Abstract]:The outlet flow state of inlet passage is one of the key factors affecting the stability of vertical axial flow pump device. Based on the whole physical model of vertical axial flow pump device, a filamentous red line and a pressure pulsation sensor are arranged on the wall of the outlet section of the elbow inlet passage. The flow state and pressure fluctuation of the elbow inlet outlet of vertical axial flow pump with different rotational speeds are studied and analyzed. The results show that when the flow rate is less than 0.7 Qbep, the deviation direction of the inner wall of the elbow inlet passage is the same as the direction of impeller rotation, and the pulsation amplitude of each measuring point increases with the increase of rotational speed. When the flow rate is greater than 0.7Qbep, the deviation direction of the inner wall of the elbow inlet passage is the same as the direction of the pump axis, and the pulsation amplitude of each measuring point decreases with the increase of the speed. At the same speed, the pulsation amplitude of each measuring point decreases first and then increases with the increase of flow rate, and the pulsation amplitude is the smallest in the optimal working condition. At different speeds, the pulsating main frequency of each measuring point at the outlet of the channel is 4 times of the frequency of rotation, and the pulsating submain frequency of each measuring point in the optimal working condition is 1 times of the frequency of rotation. With the increase of speed, the increase of the main frequency amplitude of each measuring point in the outlet section of the elbow inlet channel is different, and the amplitude increase of the pulsating main frequency amplitude of each measuring point is smaller than that of the optimal condition and the large flow condition when the flow rate is small.
【作者单位】：扬州大学水利与能源动力工程学院;江苏省水利工程建设局;
【基金】：国家自然科学基金项目(51609210) 江苏省自然科学基金项目(BK20150457) 中国博士后自然科学基金项目(2016M591932) 江苏省博士后科研资助计划项目(1601161B) 流体及动力机械教育部重点实验室开放课题项目(szjj2016-078) 江苏高校优势学科建设工程项目(PAPD)
【分类号】：TV675

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