Analysis Of Fluid-structure Interaction Heat Transfer Of Hydrodynamic Journal Bearing Considering Thermohydrodynamic

With the continuous development of modern mechanical industry, the technology level of rotating machinery is increasingly being improved. Bearing is the key component in the bearing system and power transmission system of rotating machinery, so higher and higher requirements are raised for its every aspect of performance. Hydrodynamic sliding bearing is widely used because of its prominent characteristics, such as high bearing capacity, low consumption, impact resistance, good resistance to vibration and high operating accuracy. Based on current demand for sliding bearing with high speed, high load and high precision, the temperature rise of the sliding bearing gradually becomes the focus of attention. Over high bearing bush temperature not only can soften tile materials, but also can sharply reduce lubricating oil viscosity, which, to a large extent, will reduce the maximum load that the bearing can withstand, accelerate the friction and wear of bearing bush, and eventually make bearing damage and even completely lose operational capability.In this paper, the research content is derived from the Hunan province high and new technology industrialization projects "high-end equipment with overloading sliding bearing key technology research and industrialization", in view of the hydrodynamic pressure sliding bearing lubricating oil Thermohydrodynamics effect condition of oil film flow field and the oil film bearing of fluid-solid coupling heat transfer, the following work is done:First of all,Based on the conservation equation of flow field of sliding bearing and sliding bearing oil film rupture boundary conditions, using the finite volume method,is established the calculation model of fluid dynamic pressure sliding bearing.Secondly,By taking the double oil groove circular hydrodynamic sliding bearing as the research object. under the condition of considering Thermohydrodynamics effect, pressure field and temperature field of oil film cavitation model are introduced for solving. Besides, pressure field and temperature field that are obtained under the condition of constant viscosity and viscosity-temperature effect are compared. Moreover, the influence of the oil film viscosity on its change is discussed.Thirdly, according to the results obtained through simulation software, some important static parameters relating to the bearing, including bearing characteristic number, friction coefficient, inlet flow coefficient and the discharge ratio under the viscosity-temperature effect are calculated. Additionally, the reference values are compared through drawing. Thus, they can provide researches of bearing with more accurate data and have strong practical value.At last, according to the obtained oil film pressure field and temperature field data of hydrodynamic sliding bearing, By using the co-simulation methods including two numerical simulation software FLUENT and ANSYS WORKBENCH, obtained the bearing bush of the thermal stress, temperature field distribution and the radial thermal deformation and the influence of bearing maximum temperature and maximum radial thermal deformation parameters are analyzed.Therefore, the application methods in the study has certain reference significance for the design analysis of hydrodynamic sliding bearing in high speed rotor system.