Abstract: The orthogonal design method is used to optimize design of a submersible well pump spatial guide vane. Three main geometric parameters of the submersible well pump spatial guide vane are selected, which are the inlet width, the axial length of the guide vane blade and the axial distance between the outlet edge of the guide vane blade and the field exit of the guide vane respectively. Nine groups of schemes are designed on the basis of the orthogonal method. All results from our numerical calculations and range analyses show that the axial length of the guide vane blade has a significant effect on the head and shaft power of the submersible well pump, and the inlet width of the guide vane is more sensitive to variation of the submersible well pump efficiency. The performance of the submersible well pump can be improved by fixing a certain outlet distance between the outlet edge of the guide vane blade and the field exit of the guide vane. Based on multi-objective optimization design methodology, the optimal scheme of this investigation is determined as follows: the inlet width is 25 mm, the axial length of the guide vane blade is 101 mm and the axial distance between the outlet edge of the guide vane blade and the field exit of the guide vane may take 20 mm.By further analyzing efficiency of the first three stages of the impeller and the static pressure and streamline distribution at the exit of the guide vane, it is found that current excellent design of the spatial guide vane makes the internal fluid state of the guide vane better and ensures the impeller efficiency to maintain a higher level. At the same time, the flow stability in the submersible well pump becomes better.

Key words: submersible well pump, spatial guide vane, orthogonal design, impeller efficiency