气体添加对叶片泵输油过程压力脉动影响的数值研究  

Numerical study of the effect of gas addition on the pressure fluctuation in the oil transportation process through a vane pump

作　　者：张珂 余志毅[1] 劳星胜[2] 孙伟华[1] ZHANG Ke;YU Zhi-yi;LAO Xing-sheng;SUN Wei-hua(School of Mechanical and Vehicle Engineering,Beijing Institute of Technology,Beijing 100081,China;Science and Technology on Thermal Energy and Power Laboratory,Wuhan Second Ship Design and Research Institute,Wuhan 430064,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]武汉第二船舶设计研究所热能动力技术重点实验室,武汉430064

出　　处：《船舶力学》2023年第11期1651-1660,共10页Journal of Ship Mechanics

基　　金：北京市自然科学基金项目(3212021);清华大学水沙科学与水利水电工程国家重点实验室开放基金项目(sklhse-2021-E-01);国家自然科学基金项目(52109107)。

摘　　要：为了研究气体添加对泵内流场及压力脉动特性的影响,本文基于ANSYS_CFX对一叶片式输油泵内纯油及油气两相流动进行数值模拟,其中两相工况的含气率为1%、0.5%和0.1%。沿流动方向在叶轮和导叶流道总共设置8个监测点,并对其压力脉动的时域和频域特性进行分析。结果显示:添加少量气体对叶轮流道内压力脉动影响较小,而对导叶中后部流道内压力脉动抑制明显,该处压力脉动降幅可达50%以上。通过对纯油和气体添加工况的流场分析,发现添加少量气体可改善泵内压力分布和导叶流道的旋涡结构,使该区域的流动更加平稳;所添加气体将在导叶中后部流道发生聚集,聚集区域与旋涡区位置接近,且聚集气体可对该区域的压力脉动能量起到吸收作用,从而减弱流体压力脉动。In order to study the influence of gas addition on the flow field and pressure fluctuation character-istics in pumps,the pure-oil and oil-gas two-phase flow in a vane pump was simulated through AN-SYS_CFX,and the inlet gas void fraction in the two-phase condition was 1%,0.5%and 0.1%,respectively.A total of 8 monitoring points were set up in the impeller and guide vane passage along the streamwise direc-tion,and the characteristics of pressure fluctuation in time domain and frequency domain were analyzed.The results show that adding a small amount of gas has little effect on the pressure fluctuation in the impeller pas-sage,but it can obviously inhibit the pressure fluctuation in the rear part of the guide passage,where the pres-sure fluctuation can be decreased by more than 50%.By analyzing the flow field of the two conditions,it is found that adding a small amount of gas can improve the pressure distribution in the pump and the vortex structure in the guide vane passage,and make the flow in the region more stable.The added gas will accumu-late in the rear part of the guide vane,and the aggregation region is close to the vortex region.Moreover,the accumulated gas can absorb the pressure fluctuation energy in this region,and thus weaken the fluid pressure fluctuation.

关 键 词：气体添加 叶片泵 油气两相流 压力脉动 数值分析 

分 类 号：TK7[动力工程及工程热物理—流体机械及工程]