单叶片螺旋离心泵内部流场数值计算及油膜试验研究

发布时间：2018-11-15 21:54

【摘要】：针对比转数为240的单叶片螺旋离心式潜水排污泵内部流场,采用数值计算与试验相结合的手段进行研究.以多面体网格为划分形式,应用Realizable k-ε湍流模型,对其进行了全流场定常数值计算,并将计算结果与外特性试验结果及油膜试验结果进行对比.研究结果表明:数值预测的外特性及叶轮表面迹线结果与外特性试验及油膜试验结果能够较好地吻合,验证了多面体网格在单叶片螺旋泵数值计算方面的精度;通过对单叶片螺旋泵内部流场的剖析,发现了叶片进口附近存在泄漏流动,泄漏流的强度随流量的增大而逐渐减小;在3个流量工况(0.6Q_d,1.0Q_d和1.4Q_d)下,叶片吸力面出口附近的轮毂表面存在严重的回流现象,而在0.6Q_d工况时,该回流区域占据了流道宽度的80%以上;在叶片压力面与轮毂的交界处也存在多处回流,流量越小,回流越严重;3个工况下,蜗壳出口均存在较大的速度梯度.
[Abstract]:The internal flow field of a single-vane spiral centrifugal submersible sewage pump with a specific rotation of 240 is studied by means of numerical calculation and test. In the form of polyhedron meshes, the Realizable k- 蔚 turbulence model is used to calculate the steady flow field. The calculated results are compared with the results of the external characteristic test and the oil film test. The results show that the predicted external characteristics and the surface trace of the impeller are in good agreement with those of the external characteristic test and the oil film test. The accuracy of the polyhedron mesh in the numerical calculation of the single blade screw pump is verified. Through the analysis of the flow field in the single blade screw pump, it is found that there is leakage flow near the inlet of the blade, and the intensity of the leakage flow decreases with the increase of the flow rate. Under three flow conditions (0.6 QD _ d and 1.4Q_d), the surface of the hub near the outlet of the suction surface of the blade has a serious backflow phenomenon, while in the 0.6Q_d condition, The reflux area occupies more than 80% of the channel width. At the junction of the blade pressure surface and the hub, there are many reflux points, the smaller the flow rate, the more serious the circumfluence, and the larger velocity gradient exists at the outlet of the volute under three working conditions.
【作者单位】：合肥工业大学化工机械研究所;江苏大学国家水泵及系统工程技术研究中心;蓝深集团股份有限公司;
【基金】：中央高校基本科研业务费专项资金资助项目合肥工业大学“秋实计划”A类计划项目
【分类号】：TH311

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