静置油液中单气泡运动规律研究

doi:10.3901/JME.2021.24.093

机械工程学报 ›› 2021, Vol. 57 ›› Issue (24): 93-101.doi: 10.3901/JME.2021.24.093

• 特邀专栏：液压元件及系统轻量化关键技术 • 上一篇下一篇

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静置油液中单气泡运动规律研究

李莹^1,2, 陈冬京¹, 王博众¹, 佟海生³, 孔祥东^1,2,4, 张晋^1,2,4

1. 燕山大学机械工程学院秦皇岛 066004;
2. 河北省重型机械流体动力传输与控制实验室秦皇岛 066004;
3. 内蒙古北方重工业集团有限公司包头 014033;
4. 先进制造成形技术及装备国家地方联合工程研究中心秦皇岛 066004

收稿日期:2021-06-07 修回日期:2021-10-12 出版日期:2021-12-20 发布日期:2022-02-28
通讯作者: 张晋(通信作者),男,1984年出生,博士,副教授,博士研究生导师。主要研究方向为流体传动与控制。E-mail:zhangjin@ysu.edu.cn
作者简介:李莹,女,1992年出生,博士,讲师,硕士研究生导师。主要研究方向为流体传动与控制。E-mail:yingli@ysu.edu.cn
基金资助:
国家重点研发计划（2018YFB2000703）和国家自然科学基金（52005429）资助项目。

Movement Law of Single Bubble in Static Oil

LI Ying^1,2, CHEN Dongjing¹, WANG Bozhong¹, TONG Haisheng³, KONG Xiangdong^1,2,4, ZHANG Jin^1,2,4

1. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004;
2. Hebei Provincial Key Laboratory of Heavy Fluid Power Transmission and Control, Yanshan University, Qinhuangdao 066004;
3. Inner Mongolia North Heavy Industry Group Co. Ltd., Baotou 014033;
4. Advanced Manufacture Forming Technology and Equipment, Yanshan University, Qinhuangdao 066004

Received:2021-06-07 Revised:2021-10-12 Online:2021-12-20 Published:2022-02-28

摘要/Abstract

摘要： 液压系统由于吸空、回油、气穴等原因会产生气泡，对液压元件及系统造成气蚀、噪声、振动及关键元件损坏等危害，降低系统可靠性与工作效率。油箱作为液压系统中除气的重要辅助元件，在移动设备中为保障除气等功能存在体积大、质量大的不足，限制了设备的承载能力与续航能力。油箱静置工况下的排气能力决定了其容积的大小，明确油液中的气体运动规律可以指导油箱的小型化设计，提升油箱的轻量化潜力。通过对静置油液中气体形态及运动特性进行研究采用VOF法进行气泡运动的边界追踪，得到的气泡形态与上升路径轨迹，建立静置油液中气泡自由上升的运动特性模型，计算得到40℃下46号液压油中不同直径气泡的平衡速度，并通过试验进行对比验证。研究表明液压油中气泡在上升过程中呈现球形，轨迹为直线；运动特性模型的理论速度与实际速度平均相对误差为3.272%，验证运动特性模型可靠性。研究明确油液中气泡的运动特性，建立的运动特性模型可以有效反映油箱在静置状态下的除气能力，为静置油液中的气体分离规律研究及油箱的小型化设计提供了参考。

关键词: 气液分离, 液压油, 数值计算, 气液两相流

Abstract: The hydraulic system will produce air bubbles due to air suction, oil return, cavitation and other reasons. Bubbles cause cavitation, noise, vibration and damage to key components to the hydraulic components and systems, which reduces the reliability and work efficiency of the system. As an important auxiliary component for degassing in the hydraulic system, the oil tank has the disadvantage of large volume and high quality to ensure the function of degassing in mobile equipment, which limits the carrying capacity and endurance of the equipment. The volume of tank is determined by its exhaust capacity under static conditions. A clear gas movement law in the oil can improve the miniaturization design capability and lightweight potential of the tank. By studying the gas form and movement characteristics in stationary oil, the boundary tracking of bubble movement was carried out with the VOF method, the bubble shape and ascending path trajectory were obtained, the movement characteristic model of the free rise of bubbles in the stationary oil was established and the calculation is acquired. The equilibrium velocity of bubbles of different diameters in HL-46 hydraulic oil at 40℃ was compared and verified through experiments. Results show that the bubbles in the hydraulic oil are spherical in the ascending process and the trajectory is a straight line. The average relative error between the theoretical speed and the actual speed of the motion characteristic model is 3.272%, which verifies the reliability of the motion characteristic model. The movement characteristics of bubbles in the oil are studied and clarified. The established movement characteristics model could effectively reflect the degassing ability of the tank in the static state, which provides a reference for the study of the gas separation law in the static oil and the miniaturization design of tank.

Key words: gas-liquid separation, hydraulic oil, numerical calculation, gas-liquid two-phase flow

中图分类号:

TH137

李莹, 陈冬京, 王博众, 佟海生, 孔祥东, 张晋. 静置油液中单气泡运动规律研究[J]. 机械工程学报, 2021, 57(24): 93-101.

LI Ying, CHEN Dongjing, WANG Bozhong, TONG Haisheng, KONG Xiangdong, ZHANG Jin. Movement Law of Single Bubble in Static Oil[J]. Journal of Mechanical Engineering, 2021, 57(24): 93-101.

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静置油液中单气泡运动规律研究

Movement Law of Single Bubble in Static Oil

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