Rotor Dynamic Characteristics Analysis for Tunnel-Type Turbocharger
To investigate the influence of adopting tunnel-type turbines on rotor dynamic characteristics of turbochargers,the blade-type turbine of a certain type of turbocharger was replaced with a tunnel-type one.As coupling with the sealing fluid excita-tion,the tip clearance excitation and the radial clearance excitation of the tunnel-type turbine,a model of the rotor system was built.The influence of the turbine material and the radial clearance on the critical speed,the harmonic response and the transient response of the rotor was analyzed.The results show that the first-order critical speed of rotor with tunnel-type K418 alloy turbine decreases significantly,and the steady-state response is relatively stable,but the transient response fluctuates wildly and shows in-stability so that it needs adjustment on its structure design to utilize K418 alloy as a tunnel-type turbine material.The first-order critical speed of rotor with tunnel-type SiCceramic turbine decreases and the harmonic response amplitude increases,but the influ-ence on stability of the rotor is insignificant.Its second-order critical speed increases slightly,the steady-state amplitude decreas-es,and the transient response is relatively stable.
万方数据
维普
