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基于热耦合的滑动轴承两相流场特性数值研究
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国家自然科学基金项目(51206025;51776041);教育部博士点基金项目(20120092120013).


Numerical Study of Twophase Flow Field Characteristics of Journal Bearing Based on Thermal Coupling
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    摘要:

    针对滑动轴承热动力特性,建立考虑空化效应和黏温效应的轴承转子热耦合三维模型,对转子和轴瓦的热传导方程、油膜能量方程与全空化模型进行了联合求解。计算结果表明:轴瓦最高温度出现于下轴瓦最小膜厚下游,下轴瓦的温度沿润滑油流动方向逐渐升高,而上轴瓦的温度变化较少;考虑轴承热传导和两相流特性,热耦合三维模型比绝热边界模型更符合实际情况;与绝热边界模型相比,热耦合三维模型计算出的压力分布趋势相同,但计算结果较大;随着进口油温升高,油膜最大压力、承载力、空化体积比、进出口温差变小,热耦合三维模型与绝热边界模型之间的计算结果偏差变小。采用该热耦合三维模型计算的收敛区和发散区的温度分布,均与实验数据相符,验证了建立的热耦合三维模型。

    Abstract:

    For the thermohydrodynamic characteristics of journal bearings,a threedimensional thermal coupling model of bearingrotor considering cavitation effect and viscositytemperature effect was established.The heat conduction equation of journal and bearing bush,oil film energy equation and full cavitation model were solved.The calculation results indicate that the maximum temperature of the lower bearing bush is located in downstream of the minimum film thickness.The temperature of the lower bearing bushis increased gradually along the direction of lubricating oil flow,while the temperature of the upper bearing bush changes less.Considering the bearing heat conduction and twophase flow characteristics, the thermal coupling model is more practical than the adiabatic boundary model.Compared with adiabatic boundary model,the pressure distribution trend of this model is the same,but the calculated pressure is bigger.With the increase of inlet oil temperature,oil film maximum pressure,bearing capacity,cavitation volume ratio,temperature difference between inlet and outlet are decreased,and the deviation between the thermal coupling model and the adiabatic boundary model is reduced.The temperature distribution in the convergent zone and the divergent zone calculated by the threedimensional thermal coupled model are in agreement with the experimental data,which verifies the threedimensional thermal coupled model.

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刘黄亮,郭瑞,傅行军,仇超,邓敏强.基于热耦合的滑动轴承两相流场特性数值研究[J].润滑与密封,2019,44(7):41-45.
. Numerical Study of Twophase Flow Field Characteristics of Journal Bearing Based on Thermal Coupling[J]. Lubrication Engineering,2019,44(7):41-45.

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  • 在线发布日期: 2020-03-12
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