Diagrammatic working model of Parsons type steam turbine

Diagrammatic working model of Parsons type steam turbine

This is a working model illustrating the principle and arrangement of the compound reaction turbine of the Parsons type (see inv. 1890-59, for example). It consists of a revolving drum upon which are mounted two rings of curved blades; two rings of similar blades are fixed to the casing and alternate with them, and the steam passes from the inlet end between the fixed and moving sets of blades alternately, while expanding. This arrangement of turbines in series reduces the steam and blade velocities, approximately inversely as the square of the number of rings of moving blades. In the model the casing is made of glass so that the blades may be seen.