双圆弧齿轮泵流量特性影响因素数值模拟

目的：分析新型双圆弧齿轮泵内部流场脉动特性的影响因素，采用合理参数以提高齿轮泵输出效率。方法：建立齿轮泵的二维流场仿真模型，采用计算流体力学软件Fluent进行仿真分析，研究不同齿顶间隙、不同齿轮偏心距、负载及转速对齿轮泵出油口瞬时流量、流量脉动、流场特性的影响。结果：随着齿顶间隙增大，齿轮泵出口流量逐渐减小，当齿顶间隙为0.09 mm时，出口流量脉动系数最小为0.135，为该结构参数下齿轮泵最佳齿顶间隙；受负载压力和转速的影响，齿轮泵中心轴线产生偏差，随着齿轮泵转子中心轴线偏心距增加，齿轮泵出口流量逐渐增大，当偏心距为0.05 mm时，齿轮泵出口流量比无中心偏差时增加了5.09%，提高了流量输出。结论：齿轮泵流量特性主要影响因素为转子转速和齿顶间隙，中心偏差的影响较小。

Numerical simulation of factors affecting flow characteristics of double-circular-arc gear pump

Objective: Analyzed the influencing factors of the internal flow field pulsation characteristics of the new double circular arc gear pump, and adopt reasonable parameters to improve the output efficiency of the gear pump. Methods: The two-dimensional flow field simulation model of the gear pump was established, and the computational fluid dynamics software Fluent was used for simulation analysis to study the influence of different tip clearance, different gear eccentricity, load and speed on the instantaneous flow, flow pulsation and flow field characteristics of the oil outlet of the gear pump. Results: As the tooth tip clearance increased, the outlet flow rate of the gear pump gradually decreased. When the tooth tip clearance was 0.09 mm, the minimum pulsation coefficient of the outlet flow rate was 0.135, which was the optimal tooth tip clearance for the gear pump under this structural parameter. Due to the influence of load pressure and rotational speed, the central axis of the gear pump deviates. As the eccentricity of the central axis of the gear pump rotor increased, the outlet flow rate of the gear pump gradually increased. When the eccentricity was 0.05 mm, the outlet flow rate of the gear pump increased by 5.09% compared to without central deviation, improving the flow output. Conclusion: The main influencing factors on the flow characteristics of gear pumps are rotor speed and tooth tip clearance, and the influence of center deviation is relatively small.