Abstract
The flow field of seal has been modeled by CFD method in this paper, and the effects of rotor rotational speed and eccentricity on the fluid excitation force are analyzed. In order to study the mechanism of induced vibration force in seal, the velocity field and pressure field of fluid in seal are analyzed in detail in this paper, the calculation result shows that the rotor rotation will form a spiral flow when the fluid flows into the seal, it causes the uneven pressure distribution in the seal cavity and the high pressure point is not match to the minimum clearance, thus producing a tangential exciting force perpendicular to the eccentric direction of the rotor. It’s the ultimate reason of rotor instability.
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