Structural optimization of flow channel for automobtive electric fuel pump
                                              WANG Xiao yan, ZHANG Zhen dong, LIU Jian guo, CHEN Zhong
         (School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

Abstract: In order to solve the problem of the large pressure difference between the impeller s inlet and the outlet of the initial design for the fuel pump which caused pulsation and noise and reduced the work efficiency of the pump, several balance holes and oil gas separation holes were configured at the impeller and inlet of the fuel pump. Based on the orthogonal experimental method, the balance hole s diameter, the radial radius of the balance holes, oil gas separation hole s diameter, the radial radius of oil gas separation hole were chose as four structural parameters variables.Then the L9 (34) orthogonal table was established to get nine kinds of fuel pump structure program which simulated on ANSYS simulation stage.The final selection of fuel pump that the small pressure difference between inlet and outlet and the less reduction of output flow were processed as the samples. The samples were tested with the initial design of the fuel pump on the test bench. The results indicate that the pressure difference between the inlet and outlet of the sample is significantly lower than that of the initial design, but the output flow rate is less reduced. It shows that the balance holes play a large role in reducing the pressure difference between impeller inlet and outlet, and the simulation is basically consistent with the experimental results.

Key words: fuel pump; impeller; balancing hole; oil gas hole; numerical simulation; structural optimization