Tech Lic. Me 56, Acta Polytechnica Scandinavica. Stockholm 1970

Abstract:

Hydrodynamic seals for both unidirectional and bi-directional rotation are studied. The shaft is assumed to be ideally circular and its surface is assumed to be perfectly smooth. The liquid to be sealed is assumed to be Newtonian and incompressible and the viscosity variations within the film are neglected. Subatmospheric pressures are also neglected.

The optimum geometries of the seals are determined. Radial load, power loss, and sealing capacity have been calculated.

Tests have been made for sealing capacity and power loss for an optimum unidirectional rotation seal. The agreement between theory and test is satisfactory.

Additional tests with real seals, made from synthetic rubber, showed that the power loss is smaller for a hydrodynamic seal than for a conventional seal in accordance with the theory.