不同工况下轴流泵进口流速场及其流量测试研究

Research on Axial-Flow Pump Inlet Velocity Field and Pump Flow at Different Operating Condition

采用LDV技术对长直管进水条件下轴流模型泵叶轮进口流速场进行了测试,分析研究了三种工况下叶轮进口三条测线轴向流速分布规律及Origin插值积分测流精度。结果表明:0.8 Qopt、1.0 Qopt、1.2 Qopt三种工况下叶轮进口三条测线轴向流速均无回流,分布趋势较为一致;测线一轴向流速呈抛物线分布,且1.0 Qopt和1.2 Qopt工况下分布比0.8 Qopt工况均匀;测线二及测线三轮毂侧流速较大,增大趋势较快。误差分析显示:不同工况下叶轮进口三条测线流量积分最大误差为1.58%。运用Origin插值积分工具测流,具备可操作性及适用性较强、测量精度较高等优点。

The impeller inlet velocity field of axial-flow pump under the long straight pipe inlet was tested by using LDV technology. The axial velocity distributions of impeller inlet at three measuring lines, and origin interpolation integral flow measurement accuracy under three working conditions were analyzed. The results show that under the three working conditions of 0.8 Qopt, 1.0 Qopt and 1.2 Qopt, axial velocity backflow does not exist at three measuring lines, and distribution trend is more consistent. The axial velocity of measuring line one appears parabolic distribution, and the distribution under the two working conditions of 1.0 Qopt and 1.2 Qopt is more uniform than that under the working conditions of 0.8 Qopt;The axial velocity at the hub side of measuring line two and three is greater, and increasing trend is faster. Error analysis shows that at the three measuring lines of 0.12 D, 0.22 D, 0.32 D axial distance from the impeller center, the maximum error of flow integration is 1.58% under the three working conditions. The flow can be measured accurately via the origin interpolation integral tool with the operability and applicability.