Simulation Research On Performance Of The Floating Bearing In Turbocharger Based On The Coupling Theory

In the modern automotive industry, the turbo technology is widely used and the supercharger technology continues to be developed, the various components of the turbocharger are working in the harsh environment. The cooling performance and force effect of the floating bearing body of turbocharger determines the reliability and life of turbocharger largely. The conventional design of turbocharger cooling system is often oriented in the experience design with a lot of blind.According to natural science foundation of Hunan province(10JJ6080) and state key laboratory of advanced design and manufacturing for vehicle body(61075002), a turbocharger equipped in engine has been studied. The numerical simulation of the cooling performance and strength analysis of floating bearing body were carried out based on fluid-solid coupling method and verified by the experiment. The main research works and innovational points are as follows:(1) The fluid-solid coupling numerical simulation model for floating bearing body in turbocharger was established. The sequential coupling and serial coupling methods were used for steady fluid-solid coupling numerical simulation. The distribution of temperature field and variation tendency of the cooling performance for floating bearing body was revealed.(2) Considering synthetically the impacts of the temperature field in the floating bearing and surface pressure on the bearing caused by oil shock, the strength of the bearing body was analyzed and the main failure mode of the bearing body was studied. The bearing body performance was improved by increasing the thickness of the inner wall surface of the floating bearing and achieved good results for bearing design.(3) The temperature points of the floating bearing body measured by turbocharger test bench were used for fluid-solid coupled heat transfer boundary conditions for the simulation, and the accuracy and effectiveness of simulation results were better verified by the experimental results.