Beda O. Dynamic characteristics of a rotor of a centrifugal pump taking into consideration hydrodynamic processes in a relatively long clearance seal

The dissertation Project offers advanced model of the clearance seal with spiral movement of the fluid. Based on that model, author demonstrates new method to calculate radial force that arises in the seal. The work contains diagrams for dimensionless coefficients of linearized components of the radial force, which allow to analyze an influence of the geometrical shape on the radial force without additional calculus. Next, non linear hydrostatic force analysis is presented. Such forces appear due to radial dislocation of the rotor in the seal, and it is shown that such forces have low hardness's characteristics, thus lowering dynamic characteristics of the rotor. The work presents experimental results of the nonlinear resilience force in relatively long clearance seals . Comparison of the theoretical and experimental parts proves the consistence of the model