导流器几何参数对潜水泵性能的影响

发布时间：2018-01-04 14:45

  本文关键词：导流器几何参数对潜水泵性能的影响　出处：《兰州理工大学》2012年硕士论文　论文类型：学位论文

  更多相关文章： 潜水泵 导流器 水力设计 数值模拟 内部流场分析 面积比

【摘要】：潜水泵作为一种通用机械广泛应用于工农业生产生活中，，但是目前市场上的潜水泵机组效率普遍不够高，所以有必要研究开发性能更优的潜水泵。设计中除改进叶轮外还可以通过改变导流器几何参数来生产出性能更加优异的潜水泵，适应市场需求。 本课题以潜水泵作为研究对象，通过对潜水泵全流场水力设计、过流部件三维造型并运用CFD数值模拟技术对潜水泵导流器特性及提高泵性能展开研究，对其性能进行了预测与分析，取得的研究成果如下: 第一，推导了导流器及叶轮的特性方程式，理论上分析出了导流器几何参数叶片数Z、轴面进口宽度b3及叶片进口安放角α3对导流器特性曲线的影响,得到了潜水泵最佳工况点的理论求解方法； 第二，采用FLUENT软件，选用kε模型，利用SIMPLE算法对潜水泵内部三维不可压缩湍流场在不同流量运行工况下进行了数值计算预估。通过对不同进口几何参数导流器方案的速度场、压力场的分析研究，预测出了导流器的性能。 第三，通过对同一叶轮分别与不同进口几何参数导流器匹配的潜水泵进行的数值计算得到了各潜水泵的性能曲线，并根据沿轴线方向不同Z截面总压平均量变化曲线计算出了不同方案导流器的内部能量损失，揭示了导流器叶片数Z、轴面进口宽度b3及叶片进口安放角α3对泵性能影响规律； 第四，通过对解析法计算所得的潜水泵最佳工况点与数值模拟试验所得的最佳工况点进行的误差分析，论证了潜水泵最佳工况点的理论计算方法和CFD数值模拟结果是吻合的，有实用价值的； 第五，利用潜水泵面积比系数的理论计算与实测方法，计算出同一叶轮与不同几何参数导流器匹配时面积比系数，并结合导流器几何参数Z、b3、α3对泵性能影响规律得到了250QJ125型潜水泵的最佳面积比系数最佳取值范围为0.84~0.86。并在保持叶轮不变情况下，根据研究出的结论设计出一种新的导流器(Ⅱ)，通过分析得到潜水泵(Ⅱ)的单级扬程及效率较原型泵(Ⅰ)分别提高了0.9m和1.96%，从而证明了本课题研究是有价值的； 借助CFD数值模拟技术研究潜水泵导流器的特性及泵性能，能够清晰得掌握潜水泵内部流动规律，从而判断设计参数是否合理；同时还可以缩短产品研发周期，降低成本，具有较大的科研和经济意义。
[Abstract]:Submersible pump as a kind of general machinery is widely used in industrial and agricultural production and life, but the efficiency of submersible pump units in the market is generally not high enough. So it is necessary to study and develop submersible pump with better performance. In addition to improving impeller, it is possible to produce submersible pump with better performance by changing the geometric parameters of the guide so as to meet the needs of the market. This topic takes submersible pump as the research object, through the hydraulic design of the whole flow field of the submersible pump, the three-dimensional modeling of the flow passing parts and the use of CFD numerical simulation technology to study the characteristics of the submersible pump guide and improve the pump performance. Its performance is predicted and analyzed, and the research results are as follows: Firstly, the characteristic equations of the guide and impeller are derived, and the influence of the geometric parameters of the guide on the characteristic curve of the guide is analyzed theoretically, such as the number of blades Z, the width of the axial inlet b _ 3 and the angle 伪 _ 3 of the inlet of the blade. The theoretical solution of the optimal operating point of the submersible pump is obtained. Secondly, we adopt FLUENT software and choose k 蔚 model. The 3-D incompressible turbulent field in submersible pump was calculated and predicted by SIMPLE algorithm under different flow operating conditions. The velocity field of different inlet geometric parameter diversion schemes was calculated and predicted. The performance of the guide is predicted by the analysis of the pressure field. Thirdly, the performance curves of each submersible pump are obtained by the numerical calculation of the same impeller matching with different inlet geometric parameters of the submersible pump. According to the variation curve of the total pressure of different Z section along the axis, the internal energy loss of the diversion device with different schemes is calculated, and the blade number Z of the diversion device is revealed. The influence of axial inlet width b3 and blade inlet angle 伪 3 on pump performance; 4th, the error analysis of the optimum operating point of submersible pump calculated by analytical method and the optimum working point obtained by numerical simulation test is carried out. It is proved that the theoretical calculation method of the optimum operating point of submersible pump is in agreement with the result of CFD numerical simulation and has practical value. In 5th, the area ratio coefficient of the same impeller matched with different geometric parameters was calculated by using the theoretical calculation and the actual measurement method of the area ratio coefficient of the submersible pump, and combined with the geometric parameter ZB3 of the diversion device. The optimum area ratio coefficient of the 250QJ125 submersible pump was obtained from the effect of 伪 3 on the pump performance in the range of 0.84V 0.86, and the impeller was kept unchanged. According to the conclusion of the study, a new type of diversion (鈪

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