A review of the experimental estimation of the rotor dynamic parameters of seals

In this paper, we present a critical review of the experimental estimation of the rotor dynamic parameters (RDPs) of different types of seals. The main focus is on rotary seals for high-speed and high-pressure applications. These play an active role between the rotating and stationary parts of turbomachinery to prevent working fluid leakage; however, they can cause rotor instability. The main parameters that govern the instability are the RDPs of seals. This review includes a variety of rotary seals, a description of experimental rigs and measurement techniques, parameter estimation procedures, and uncertainty analysis. Based on the state of the art in the experimental estimation of the RDPs of seals, conclusions are made and future directions are suggested.