Patent ID: 6238177
Filing Date: 2001-05-29
Classification: F01D,F04D

Abstract:
A turbine comprising:(a) a first Prandtl layer turbine comprising a first housing having a first shaft rotatably mounted in the housing;(b) a plurality of first spaced apart discs having, an upstream end, a downstream end, an outer diameter and mounted on the first shaft to define first fluid flow passages between adjacent first spaced apart discs and rotatable therewith, each first disc having a radial inner end defining an inner opening, a radial outer end and a pair of opposed surfaces extending there between;(c) a second Prandtl layer turbine comprising a second housing having a second shaft rotatably mounted in the housing; and,(d) a plurality of second spaced apart discs having, an upstream end, a downstream end, an outer diameter and mounted on the second shaft to define second fluid flow passages between adjacent first spaced apart discs and rotatable therewith, each second disc having a radial inner end defining an inner opening, a radial outer end and a pair of opposed surfaces extending there between, the outer diameter of at least some of at least one of the first spaced apart discs and the second spaced apart discs varies from the upstream end to the downstream end.