Simulation Study On The Cooling Mechanism Of Water-cooled Bearing In Turbocharger

With the continuous development of automobile industry, working environmentof components is adversed, the cooling performance of water-cooled bearing inturbocharger become largely determines the use age of turbocharger. But thetraditional designing method of the water-cooled bearing in turbocharger is based onthe experience, which is bold and blind. According to Natural science foundation ofHunan province (10JJ6080), this article comes forward a better numerical method ofthe cooling performance to bearing, then make a further analysis about cooolingmechanism. The main research works and innovational points are as follows:(1) Established mathematical models about the solid heat transfer forwater-cooled bearing in turbocharger、flow and heat transfer to cooling water and oil、conjugate heat transfer on the fluid-solid boundary. Based on the mechanism ofwater-cooled bearing in turbocharger, a sequence coupling method of numericalsimulation was built.(2) A liquid-solid coupling model was built by combining with the characteristicsof CFD software and FEA software, and the numerical simulation and experimentcomparison of the cooling performance of bearing were carried out under steady state.In additional, after analysed the temperature distribution and cooling performance ofbearing, it was carried out optimization design by changing the cooling water mode offlow.(3) According to the Working principle of turbocharger, established overallconfiguration、measurement and control scheme about the turbocharger test bench.According to the test on turbocharger bench, verified the correctness of numericalsimulation method of fluid-solid coupling heat transfer to the water-cooled bearing inturbocharger. And then analysed the influence of inlet pressure and temperature ofcooling medium、turbine speed and air temperature before turbocharger to the floatingbearing temperature and cooling performance of water-cooled bearing in turbocharger.