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阐述了螺旋轴流泵的原理和设计方法,基于商业软件ANSYS CFX对设计的螺旋轴流泵进行了数值计算,并与试验结果进行了对比分析.结果表明:0.8Qd工况时,在叶轮轮毂与叶片结合处存在局部高压区和漩涡,随着流量的增大,局部高压区和漩涡逐渐减小并消失;设计工况和1.2Qd工况时,泵内部压力和速度分布逐渐均匀,流动平稳,入流平顺;设计工况下,试验扬程H=5.38m,比规定值高7.6%,比预测扬程低4.8%;试验效率η=77.8%,比规定值高2.8%,比预测值低3.1%,最高效率点为1.2Qd工况,效率为78.9%,比预测值低5.8%,偏大工况运行;运行全过程中,获得了平滑下降的Q-H曲线和功率曲线,无马鞍区,无过载现象发生,达到了设计要求.
The principle and design method of helical axial flow pump are expounded, the helical axial flow pump designed based on commercial software ANSYS CFX is calculated and compared with the experimental results.The results show that: 0.8Qd working conditions, the impeller hub The local high pressure area and vortex exist at the junction with the vane. As the flow rate increases, the local high pressure area and vortex gradually decrease and disappear. In the design condition and 1.2Qd condition, the distribution of pressure and velocity inside the pump is gradually uniform and flow smoothly , And the inflow was smooth. In the design conditions, the test head H = 5.38m, 7.6% higher than the specified value and 4.8% lower than the predicted head. The test efficiency η = 77.8%, higher than the specified value by 2.8% and lower than the predicted value by 3.1% , The maximum efficiency point is 1.2Qd, the efficiency is 78.9%, which is 5.8% lower than the predicted value and runs at a too large working condition. During the whole operation, the QH curve and power curve with smooth descent are obtained without saddle zone and no overload Phenomenon occurred, reached the design requirements.