| Summary: | On the basis of the linearized fluid forces acting on the rotor obtained directly by using the two-dimensional Navier-Stokes equations, the stability of symmetrical rotors with
a cylindrical chamber partially filled with a viscous incompressible fluid is investigated
in this paper. The effects of the parameters of rotor system, such as external damping
ratio, fluid fill ratio, Reynolds number and mass ratio, on the unstable regions are
analyzed. It is shown that for the stability analysis of fluid filled rotor systems with
external damping, the effect of the fluid viscosity on the stability should be considered.
When the fluid viscosity is included, the adding external damping will make the system
more stable and two unstable regions may exist even if rotors are isotropic in some
casIs.
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