Study on the Influence of the Medium Dynamic Viscosity on the Performance of the Special High Viscosity Gear Pump

doi:10.3901/JME.2025.06.340

Abstract

Abstract: Starting from the foundation, paper studies the internal flow field of special high viscosity pump by using computational fluid dynamics method. Based on the flow field data, the influence of the dynamic viscosity of the conveying medium on the pump performance parameters is emphatically studied. In order to improve the accuracy of the simulation, the turbulent RNG κ-ε is modified according to the characteristics of the internal flow field of the gear pump Model, combined with cavitation model, the flow field analysis equations are established. According to the calculated data of pressure field and velocity field in the pump, the influence of medium viscosity on performance parameters is analyzed. The increase of the medium viscosity leads to the decrease of the inlet pressure and the increase of the outlet pressure of the special pump. The laminar flow characteristics of the flow are obvious. The outlet flow pulsation of the pump is stable, and the pulsation amplitude increases with the increase of the medium viscosity. When the medium viscosity and the number of teeth of the special gear pump are considered at the same time, it can be seen that when the medium viscosity is in the medium viscosity section, the performance of the special pump is better when the number of teeth is 14. According to the simulation results, a 14 tooth high viscosity pump is designed and manufactured, and three different viscosity media are used to test. The results are in good agreement with the numerical results. The results of the paper will lay a theoretical foundation for the optimal design of high-end viscosity pump gears.

Key words: conveying medium, dynamic viscosity, special pump, high viscosity pump

CLC Number:

O373

LIU Chunbo, YUAN Xiaoqing, HU Jiahui, ZHANG Xudong. Study on the Influence of the Medium Dynamic Viscosity on the Performance of the Special High Viscosity Gear Pump[J]. Journal of Mechanical Engineering, 2025, 61(6): 340-348.

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