叶片安装角对轴流泵空化性能的影响

Taking the TZX700 axial-flow pump as the research object, the commercial software ANSYS CFX17.0 was used to conduct a three-dimensional numerical calculation study on the full flow passage of the axial-flow pump, and an external characteristic experiment was carried out on this axial-flow pump on a closed test bench. The experimental results were in agreement with the numerical calculation results. Four blade installation angle schemes were proposed for this axial-flow pump under the design working condition, and the variation law of the cavitation performance inside the axial-flow pump with the blade installation angle was analyzed. The results show that the critical cavitation allowances of this axial-flow pump when the blade installation angles are +4°, +2°, 0° and -2° are 7.79 m, 6.77 m, 6.45 m and 5.94 m respectively; cavitation first occurs at the blade tip near the blade inlet edge, and as the inlet pressure decreases, the cavitation area further develops towards the outlet edge and the blade root; as the blade installation angle of this axial-flow pump decreases, the cavitation area on the blade surface gradually decreases, and the distribution law of the cavitation area on each blade surface is consistent, but its cavitation area is different and there is a certain asymmetry.

以TZX700型轴流泵为研究对象,采用商业软件ANSYS CFX17.0对轴流泵全流道进行三维数值计算研究,并对该轴流泵在闭式实验台上进行了外特性实验,实验结果和数值计算结果相吻合。针对该轴流泵在设计工况下提出4种叶片安装角方案,分析轴流泵内部的空化性能随叶片安装角的变化规律。结果表明,该轴流泵在叶片安装角为+4°、+2°、0°和-2°时的临界空化余量分别为7.79 m、6.77 m、6.45 m和5.94 m;空化首先发生在靠近叶片进口边的叶顶处,随着进口压力的降低,空化区域进一步向出口边和叶根处发展;该轴流泵随着叶片安装角的减小,叶片表面的空化面积逐渐减小,且每个叶片表面的空化区域分布规律一致,但其空化面积不同,存在一定的非对称性。