Study on stability of water lubricated rotor of turbine energy recovery integrated machine
In order to ensure the stable operation of the turbine energy recovery unit in the membrane seawater desalination system,the stability of the water-lubricated rotor of the unit was studied in this paper.Based on the theory of hydrodynamic pressure sliding bearing,at the same time,considering the water film lubrication bearing and mouth ring clearance of hydrodynamic pressure lubrication effect,on the MATLAB platform by using finite difference method,the perturbation incremental method to solve the Reynolds equation,get water lubricated sliding bearing,the dynamic performance of the mouth ring coefficient,and the water lubrication,the dynamic characteristic equations of the rotor system are solved.Then the stability of the rotor system is judged,and the relationship between the speed and the mass of the rotor system under the critical state is studied.The results show that the bearing capacity of the water film in the mouth ring clearance can not be ignored in the stability analysis of the rotor,otherwise it will produce a large error.After considering the hydrodynamic lubrication effect caused by the mouth ring,the water film pressure at the sliding bearing decreases by about 40%,the dynamic characteristic coefficient of the system increases,and the critical speed ratio of the system increases by 3 000 r/min and the critical mass increases by 8.4%when only the sliding bearing is considered.In addition,the main stiffness coefficient and cross damping coefficient of the sliding bearing are obviously higher than that of the ring due to the influence of rotational speed.The research results provide reference for further improving the reliability of water-lubricated rotor system of seawater desalination machine.
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