Study Of The Stability Of Turbocharger Rotor Based On The Lubrication System

With the popularity of turbocharging technology,turbocharger is widely applied in automotive engines.The vehicle equipped with turbocharger has strong advantages of low displacement and high power.However,the working environment of the turbocharger is very harsh.As one of the core components of the turbocharger,the rotor of the turbocharger often operates at high speeds and temperatures,and is prone to instability.This will lead to turbocharger failure or even an accident.Therefore,it is of great significance to study the stability of the turbocharger rotor to improve the life of the rotor.The failure of Lubrication and cooling is one of the main factors that cause rotor instability.The lubrication system is the key to ensure stable operation of the turbocharger.Therefore,it is very important to study the stability of the rotor from the point view of lubrication.Combining with the existing experimental conditions and research hotspots,this paper takes the lubricant oil inlet pressure as the key parameter to perform the simulation analysis of the turbocharger rotor stability.The turbocharger test bench system is designed to perform rotor stability test under different oil pressures,and the influence of oil pressure on rotor stability is ascertained.This study effectively reduces the turbocharger failure rate and increases service life of the turbocharger.At the same time,it provides reference for the application and stability of turbocharger,and has certain engineering practical value.The main research work is as follows;Study on the influence of oil inlet pressure on lubricating characteristics of floating ring bearings.The simulation model of floating ring bearing is established by numerical simulation,and the lubrication characteristics of floating ring bearing are studied.Analyze the influence of oil pressure on the oil film pressure distribution of the floating ring bearing,the temperature rise at the end of the beaing,the clearance of the oil film,the eccentricity and the discharge.The results show that with the increase of oil inlet pressure,the lubrication characteristics of the floating ring bearing are improved.Study on the effect of bearing dynamic characteristics on rotor stability.Analyze the mechanism of rotor instability,and establishe the mathematical model of rotor critical speed.Considering the gyroscopic effect,the finite element method is used to analyze and calculate the inherent characteristics of the rotor system.The stiffness coefficient of floating ring bearing is used as the control parameter to determine its effect on the stability of the turbocharger rotor.Experimental study on influence of hydraulic pressure on the stability of turbocharger rotor.The stability test bench system of turbocharger rotor is designed,and the test scheme of the turbocharger rotor stability is proposed.On the turbocharger test rig built,the turbocharger is tested under different oil pressure and speed conditions to obtain the axis locus diagram and waveform diagram of the rotor vibration.The test results show that the center position of the rotor axis is different under different lubricating oil pressure.By increasing the oil inlet pressure,the orbital range of the rotor axis decreases and the sway of the rotor decreases.The stability test of the turbocharger rotor is more intuitively explored the effect of the oil inlet pressure on the rotor stability,and can provide guidance and reference for improving the he life and reliability of the turbocharger.