最佳工况下空间导叶进口几何参数的优化设计

Optimal design of geometric parameters of diffuser inlet under optimal working conditions

通过井用潜水泵最佳工况点的确定,获得最佳工况下空间导叶的特性方程,分析发现导叶进口几何参数(进口安放角和进口宽度)之间具有一定的相关性.为验证导叶进口几何参数之间的关系,选取200QJ50型2级井用潜水泵作为研究对象,采用数值模拟与试验相结合的方法,在导叶进口安放角和进口宽度的组合变化下,建立16组潜水泵模型,对井用潜水泵的性能变化规律及内部流场进行研究.结果表明:导叶进口几何参数的选取符合最佳工况下空间导叶的特性方程时,可减小导叶引起的水力损失,提升泵的性能.将给定的进口宽度代入最佳工况下空间导叶的特性方程,求得的进口安放角与该进口宽度下对应模拟的最佳进口安放角相比,两者的差值在1°以内,说明利用最佳工况下导叶的特性方程来确定其进口几何参数的方法具有一定的准确性,研究结果为空间导叶的优化设计提供参考.

Through the determination of the best operating point of the well-used submersible pump,the characteristic equation of the diffuser under the optimal working condition was obtained,and the analysis shows that there is a certain relationship among the geometric parameters of the inlet of the diffuser(the angle and width of the inlet).In order to verify the relationships among the geometric para-meters of the diffuser inlet,200QJ50 two-stage well submersible pump was selected as the research object.By using the method of combining numerical simulation and experiment,16 sets of submersible pump models were established to study the performance change law and internal flow field of well submersible pumps under the combined changes of the diffuser inlet angle and inlet width.The results show that when the geometric parameters of the inlet of the guide blade are selected in accordance with the characteristic equation of the same diffuser under the optimal working conditions,the hydraulic loss of the diffuser can be reduced and the pump performance can be improved.Comparing the inlet placement angle obtained by bringing the given inlet width into the characteristic equation of the same diffu-ser under the optimal working condition and the corresponding simulated optimal angle under the inlet width,the difference between them is within 1°,it shows that using the characteristic equation of the diffuser under the optimal working conditions to select the geometric parameters of the diffuser inlet has certain accuracy,which provides a reference for the optimal design of the diffuser.