转频调制下齿轮泵压力脉动机理  

Pressure pulsation mechanism of gear pump with frequency modulation

作　　者：许文纲 王志颖 孙闯[1] 严如强 陈雪峰[1] XU Wengang;WANG Zhiying;SUN Chuang;YAN Ruqiang;CHEN Xuefeng(School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学机械工程学院,西安710049

出　　处：《航空学报》2022年第9期213-226,共14页Acta Aeronautica et Astronautica Sinica

基　　金：国家重点研发计划(2018YFB1702400);国家自然科学基金(51835009);陕西省自然科学基础研究计划(2020JQ-042)。

摘　　要：齿轮泵作为一种主要的燃油泵,是航空发动机燃油系统的核心部件,其工作特性直接影响着发动机的整机性能,为了解决齿轮泵压力脉动机理不明确的问题,对齿轮泵压力脉动进行动力学建模研究。首先,运用欧拉法建立了齿轮泵单齿啮合过程压力脉动的动力学模型,分析了单齿啮合过程中压力脉动的变化规律,通过比较齿轮泵出口压力脉动仿真数据和实验数据来验证模型的正确性。其次,齿轮泵出口流体作湍流流动,根据齿轮泵的周期性运动分析了出口测量点处的压力脉动模型,讨论了转频对压力脉动信号的调制作用。最后,讨论了不同工况条件对压力脉动的影响,随着工作负载的增大,压力脉动频率不变,脉动幅值增大;随着转速的提高,压力脉动的频率增大,脉动幅值减小。Gear pump,as a main fuel pump,is a core component of aero-engine fuel system.Its safety performance directly affects the performance of the whole engine.In order to solve the problem that the mechanism of pressure pulsation of gear pump is not clear,the dynamic modeling of pressure pulsation during gear meshing is studied.Firstly,the dynamic model of pressure pulsation in the process of single gear meshing of gear pump was established by Euler method,and the variation rule of pressure pulsation in the process of single tooth engagement was analyzed.The correctness of the model was verified by comparing the simulation data and experimental data of pressure pulsation at the outlet volume of gear pump.Secondly,considering that the outlet volume fluid of the gear pump is turbulent,the pressure pulsation model at the outlet measuring point is proposed according to the periodic movement of the gear pump,and the modulation effect of the frequency on the pressure pulsation signal is discussed.Finally,the influence of different working conditions on pressure pulsation is discussed.With the increase of the workload,the frequency of pressure pulsation remains unchanged,but the amplitude of pressure pulsation increases.With the increase of rotating speed,the frequency of pressure pulsation increases and the amplitude of pressure pulsation decreases.

关 键 词：齿轮泵 压力脉动 燃油系统 欧拉法 湍流流动 

分 类 号：V233.91[航空宇航科学与技术—航空宇航推进理论与工程]