实际液压系统工作条件一直处于动态演变过程。为了分析变工况后新月形内齿轮泵空化流场的演进规律,提出了一种分布式参数模型,该模型利用动网格技术及两相流模型相结合来模拟齿轮泵中含气油液的流动状况。根据因子水平表及正交表性质设计了正交试验方案,在此基础上计算了不同试验对应的三维内流道模型并获得了流场特性及空化演进规律。结果表明:该类型齿轮泵中无明显困油区域,转子区是整个泵内压力最高也是最低的区域;转速一定时,油温对最低压力的影响最大,含气量次之,工作压力的影响可忽略;啮合区中的空化演进规律最为明显,气相整体呈现出先均匀分布,再分散集中,最后又均衡分布的变化规律;压力演变是气相发生运移的根本原因。
Abstract
The actual working conditions of the hydraulic system have been in a dynamic evolution process. In order to analyze the evolution law of the cavitation flow field of the crescent internal gear pump after changing working conditions, a distributed parameter model was proposed. The model uses dynamic mesh technology and two-phase flow model to simulate the flow condition of the oil with gas in gear pump. The orthogonal test protocol was designed according to the factorial level table and the nature of the orthogonal table. On this basis, the three-dimensional internal flow channel models corresponding to different tests were calculated, and the flow field characteristics and the cavitation evolution laws were procured. The results show that there is no obvious trapped oil area in this type of gear pump and the rotor region is the region with the highest and lowest pressure in the whole gear pump. When the rotational speed is constant, the oil temperature has the greatest influence on the minimum pressure in the rotor area, followed by the gas content, and the influence of the working pressure can be ignored. The cavitation evolution law in the meshing area is the most obvious, and the gas phase as a whole shows a change law of uniform distribution at first, then scattered and concentrated, and finally balanced distribution. Pressure evolution is the fundamental cause of gas migration.
关键词
新月形内齿轮泵 ;
工作条件 ;
正交试验 ;
动网格 ;
多相流 ;
空化流场 ;
对比实验
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Key words
crescent internal gear pump ;
working conditions ;
orthogonal test ;
dynamic grid ;
multiphase flow ;
cavitation flow field ;
comparative experiment
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参考文献
[1] CHAI Hongqiang, YANG Guolai, WU Guoguo, et al. Research on Flow Characteristics of Straight Line Conjugate Internal Meshing Gear Pump [J]. Processes, 2020,8(3):26901-26928.
[2] CAO Wenbin, LIU Yinshui, DONG Jie, et al. Research on Pressure Pulsation Characteristics of Gerotor Pump for Active Vibration Damping System [J]. IEEE Access, 2019,(7):116567-116577.
[3] 邓龙,杨国来,柴红强,等.液压冲击器内部流动特性分析[J].液压与气动,2021,45(8):115-121.
DENG Long, YANG Guolai, CHAI Hongqiang, et al. Analysis of Internal Flow Characteristics of Hydraulic Impactor [J]. Chinese Hydraulics & Pneumatics, 2021,45(8):115-121.
[4] 魏伟锋,张广鹏,杜真一,等.参数化直线共轭内啮合泵齿廓设计方法[J].机械工程学报,2014,50(3):49-55.
WEI Weifeng, ZHANG Guangpeng, DU Zhenyi, et al. Design Method of Internal Rotary Gear Pump by Parameterized Line Conjugated Tooth Profile. Journal of Mechanical Engineering [J]. Journal of Mechanical Engineering, 2014,50(3):49-55.
[5] 胡翰林,崔建昆,徐金波.直线共轭内啮合齿轮副齿形参数优化设计[J].机械传动,2015,39(1):77-79.
HU Hanlin, CUI Jiankun, XU Jinbo. Optimal Design of Tooth Profile Parameter of Straight-conjugate Internal Gear Pair [J]. Journal of Mechanical Transmission, 2015,39(1):77-79.
[6] 崔建昆,秦山.直线共轭内啮合齿轮泵的流量脉动分析[J].机械设计,2004,21(1):157-158.
CUI Jiankun, QIN Shan. Flow Pulsation Analysis of Linear Conjugate Internal Gear Pump [J]. Journal of Mechanical Design, 2004,21(1):157-158.
[7] 徐学忠,宋天麟.直线共轭齿轮泵的流量特性分析与仿真[J].煤矿机械,2008,29(7):47-49.
XU Xuezhong, SONG Tianlin. Analysis of Flow Characteristics of Gear Pump with Straight Line Profile [J]. Coal Mine Machinery, 2008,29(7):47-49.
[8] 王仲伟,崔建昆,张丽华.直线共轭内啮合齿轮泵的瞬时流量分析[J].流体传动与控制,2013,(4):23-26.
WANG Zhongwei, CUI Jiankun, ZHANG Lihua. Instantaneous Flow Analysis of Linear Conjugate Internal Gear Pump [J]. Fluid Power Transmission and Control, 2013,(4):23-26.
[9] 柴红强,杨国来,刘小雄,等.油液属性对直线共轭内齿轮泵流动特性的影响[J].华中科技大学学报:自然科学版,2022,50(4):19-25.
CHAI Hongqiang, YANG Guolai, LIU Xiaoxiong, et al. Influence of Oil Properties on Flow Characteristics of Straight Line Conjugate Internal Meshing Gear Pump [J]. Journal of Huazhong University of Science and Technology: Natural Science Edition, 2022,50(4):19-25.
[10] 王郑力,张振山,张方方,等.直线共轭内啮合齿轮泵困油的参数影响分析[J].机械传动,2014,38(5):91-93.
WANG Zhengli, ZHANG Zhenshan, ZHANG Fangfang, et al. Analysis of the Effect of Parameters on Trapping Oil of Straight Conjugate Internal Gear Pump [J]. Journal of Mechanical Transmission, 2014,38(5):91-93.
[11] SEDRI F, RIASI A. Investigation of Leakage within an External Gear Pump with New Decompression Slots: Numerical and Experimental Study [J]. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2019,41(5):22401-22412.
[12] SUO X, JIANG Y, WANG W. Hydraulic Axial Plunger Pump: Gaseous and Vaporous Cavitation Character-istics and Optimization Method [J]. Engineering Applications of Computational Fluid Mechanics, 2021,15(1):712-726.
[13] 吴晓明,王小鹏,马立瑞.基于集中参数法内啮合齿轮泵AMESim模型的建模方法与仿真研究[J].液压与气动,2017,(7):103-109.
WU Xiaoming, WANG Xiaopeng, MA Lirui. Modeling and Simulation Based on Lumped Parameter Method by AMESim for Internal Gear Pump [J]. Chinese Hydraulics & Pneumatics, 2017,(7):103-109.
[14] SINGHAL A K, ATHAVALE M M, LI H, et al. Mathe-matical Basis and Validation of the Full Cavitation Model [J]. Journal of Fluids Engineering, Transactions of the ASME, 2002,124(3):6176-6124.
[15] 许耀铭.油膜理论与液压泵和马达的摩擦副设计[M].北京:机械工业出版社,1987.
XU Yaoming. Oil Film Theory and Design of Friction Pair of Hydraulic Pumps and Motors [M]. Beijing: China Machine Press, 1987.
[16] CHEN Qiping, WU Mingming, KANG Sheng, et al. Study on Cavitation Phenomenon of Twin-tube Hydra-ulic Shock Absorber Based on CFD [J]. Engineering Applications of Computational Fluid Mechanics, 2019,13(1):1049-1062.
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