Research into the dynamic coefficient of the rotor-seal system for teeth-on-stator and teeth-on-rotor based on an improved nonlinear seal force model

Abstract

It is well known that seal force has a great influence on dynamic coefficients of the rotor-seal system and Muszynska’s model is employed by many scholars to research the seal system. But the rotor-seal system has larger eccentricity ratio, Muszynska’s model will not describe the characteristics of the rotor-seal system well. So a more accurate model is critical for describing the seal force. An improved nonlinear model of a rotor-seal system is proposed for describing seal force of the rotor-seal system based on the two-control-volume model and rotor motion equation. This model can not only solve the larger eccentric problem but can also bring a simple calculation through the numerical methods. Dynamic coefficients of the rotor-seal system are also researched based on the new nonlinear model under the condition of the tooth-on-stator and tooth-on-rotor. In order to verify that the equation-control model is correct, Childs and Scharrer's experiment and two-control-volume model are employed and there is a comparison between theoretical results and experimental results. The result shows that theoretical results from the improved model are in better agreement with Childs and Scharrer's experiment than two-control-volume model. The proposed model in this paper provides a theoretic reference for further research on the rotor-seal system.