Wellendichtungen und Schubausgleich

This paper gives a rational theoretical treatment of the labyrinth problem, based on the actual flow characteristics typical for a sharp-edged orifice. The general relations between leakage, number of throttlings, and pressure distribution are given in graphical form on a chart intended for use in practical turbine design. It is also shown how the effect of kinetic energy being carried from one throttling into the next can be considered rationally. The numerical constants left open by the theory are derived experimentally with the aid of a static labyrinth leakage-testing device.