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We discuss the dynamic force and torque characteristic of annular gapsresulting from an axial flow component. First, the rotordynamic influence ofannular gaps with an axial flow component is recapitulated. So far there is asevere lack of understanding the dynamic force and torque characteristic ofannular gaps. Second, a new simulation method is presented, using a perturbedintegro-differential approach in combination with power-law ansatz functionsfor the velocity profiles and a Hirs' model to calculate the dynamic force andtorque characteristics. Third, an extensive parameter study is carried out. Toevaluate whether or not the hydraulic tilt and torque coefficients need to betaken into account, an effective stiffness is defined and the influence of theannulus length, an eccentrically operated shaft, the centre of rotation, amodified Reynolds number, the flow number and the pre-swirl is investigated.

Dynamic force and torque characteristic of annular gaps -- Simulation results and evaluation of the relevance of the tilt and torque coefficients