Influence of Suction Pressure on Cavitation Characteristics of External Gear Pump

被引：0
|
作者：
Li M. [1 ]
Yang G. [1 ]
Li X. [2 ]
Bai G. [1 ]
Chai H. [1 ]
机构：
[1] School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou
[2] School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2019年 / 50卷 / 03期
关键词：
Cavitation characteristics; External gear pump; Numerical simulation; Suction pressure; Visualization test;
D O I：
10.6041/j.issn.1000-1298.2019.03.048
中图分类号：
学科分类号：
摘要：
External gear pumps are mostly used in open hydraulic circuit, such as transmission, pressurization, fuel injection and lubrication, etc. Because of the low suction pressure of the pump, air will be mixed into oil inevitably, which has a negative impact on the hydraulic system. In some special occasions, such as high altitude hydraulic system, because the equipment works at high altitude environment, the suction pressure of the fuel pump (e.g. gear pump) will be lower than the ordinary atmospheric pressure, which will undoubtedly lead to under-pressure suction of the gear pump and aggravate the cavitation phenomenon. In order to study the influence of high altitude working environment on the performance of gear pump, it is very important to fully understand the flow law of oil in gear pump and analyze the influence of oil suction pressure on its cavitation characteristics. In order to study the influence of suction pressure on cavitation characteristics of external gear pump, numerical simulation and visualization test method were used to analyze an involute external gear pump. The gear pump was widely used in fuel injection system. The simulation and test were carried out at 0.05 MPa,0.10 MPa and 0.15 MPa, respectively. The vapor volume fraction distribution of the gear pump's internal flow field was numerically simulated. The actual flow state, bubble size, number of bubbles and cavitation degree in the gear pump were recorded and observed. The results showed that at different suction pressures, the fluid in the gear pump would have different degrees of cavitation. The cavitation intensity from strong to weak was as following: vortex flow, veil flow and bubbles. With the increase of suction pressure, the number and volume of bubbles of the oil would be decreased gradually, which would reduce the max value of vapor volume fraction and cavitation degree of the oil, made the flow state of the oil more and more stable, and then improved the continuity and stability of gear pump's outlet flow. © 2019, Chinese Society of Agricultural Machinery. All right reserved.
引用
收藏
页码：420 / 426
页数：6
相关论文
共 22 条
  • [1] Zhou J., Study on cavitation in multi-connected volumes and its effects on the operation of gear pumps, (2015)
  • [2] Li J., Design of hydraulic system and lightweight research of drill arm of drill jumbo used in small section tunnel of plateau, (2016)
  • [3] Li G., Analysis of altitude performance of aeroengine oil pump, Aeroengine, 34, 1, pp. 46-47, (2008)
  • [4] Jin S., The influence and measure of plateau's environment for engineering mechanical power system, Journal of Qinghai Normal University (Natural Science), 20, 4, pp. 48-50, (2004)
  • [5] Riemslagh K., Vierendeels J., Dick E., An arbitrary Lagrangian-Eulerian finite volume method for the simulation of rotary dis-placement pump flow, Applied Numerical Mathematics, 32, 4, pp. 419-433, (2000)
  • [6] Du R., Xie A., Zhou H., Et al., Simulation on internal gear pumps utilizing lumped parameter approach, Journal of Huazhong University of Science and Technology (Natural Science Edition), 46, 9, pp. 101-106, (2018)
  • [7] Campo D., Castilla R., Raush A., Et al., Numerical analysis of external gear pumps including cavitation, ASME Journal of Fluids Engineering, 134, 8, (2012)
  • [8] Wen C., Li Y., Zhong F., Research on cavitation performance on the inlet side of the gear pump, Machine Tool &Hydraulics, 46, 19, (2018)
  • [9] Liu W., Wang A., Zhang X., Et al., Parametric on transition zone damping structure in high-pressure gear pumps, Transactions of the Chinese Society for Agricultural Machinery, 44, 6, pp. 280-286, (2013)
  • [10] Lu Y., Liu Z., Huang J., Numerical simulation of the two-phase flow in external gear pump, Lubrication Engineering, 37, 1, pp. 17-21, (2012)
123