Abstract In order to study the influence of flow pulsation coefficient on the internal flow field of external helical gear high-pressure pump, the influence of the helix angle on the flow pulsation coefficient is analyzed by the theoretical formula. Combined with computational fluid dynamics(CFD),the numerical experiment of the flow field in the external gear helical gear was carried out, and the influe-nce of different speeds and radial clearances on the pressure pulsation and flow characteristics was ana-lyzed.The results show that the larger helix angle will reduce the flow pulsation coefficient, it is good for improving the quality of the outlet flow and reducing the gear pump leakage. Furthermore, when the speed and radial clearance increase within a certain range, the pulsation coefficient decreases and the leakage vortex intensity also decreases. When the rotational speed and radial clearance continue to increase, the pulsation coefficient tends to be stable.When the rotational speed increases, the pressure in the meshing area varies greatly, but the gear pressure near the pump wall changes little. On the other hand,when the radial clearance increases, the leakage flow and leakage vortex intensity will be reduced, the quality of outlet flow will also improved by increasing the speed and radial clearance. The study of the motion law and flow pulsation characteristics of the internal flow field of the high-pressure pump is of some reference value to the design and optimization of the external helical gear.
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