In order to research the important influence factors of the coefficient of the flow rate pulsation φ on the external gear pump, the analytic way of deducing and simulation was adopted. By deducing the formulation of the coefficient of flow rate pulsation, the relationship between gear number, press angle and φ were analyzed. A numerical simulation of the transient flow field of the gear pump was performed by using the moving boundary condition and dynamic mesh method with k-ε turbulent model, and the relationships among the loading pressure,the clearance and the φ were achieved. The result shows that the coefficient of flow rate pulsation will decrease with the increasing of the gear number z or the pressure angle α. It is good for improving the flow rate characteristic of the gear pump. Furthermore, the gear number makes a very similar function in improving the flow characteristics with the pressure angle′s function. On the other hand, the coefficient of the flow rate pulsation will also decrease with the loading pressure p or the clearance δ increasing. The exaggerated loading pressure and clearance δ will lead to the volumetric efficiency decreasing, and this characteristics should be attached great importance in pump design procedure.
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