초록 ▼

Film cooling of the blades of an expander is achieved by supplying steam generated at the outlet of the expander to a plurality of discharge points. In one embodiment, a plurality of passages are formed in the hub of the expander and underlie each of the vanes. Tubes are located at the inlet end of

Film cooling of the blades of an expander is achieved by supplying steam generated at the outlet of the expander to a plurality of discharge points. In one embodiment, a plurality of passages are formed in the hub of the expander and underlie each of the vanes. Tubes are located at the inlet end of each vane and form a fluid path with the associated underlying passage and discharge steam over the entire height of the inlet end of the vane. Additional passages provide fluid communication between the underlying passages and the base of the associated vane so that film cooling is supplied to the entire inducer section of the expander.

대표청구항 ▼

A method for providing thermal protection to a hot gas expander having solid vanes including the steps of: rotating the expansion wheel of a hot gas expander by passing hot gas therethrough; supplying a cooling media to the inlet end of each vane of the rotating expansion wheel; distributing the coo

A method for providing thermal protection to a hot gas expander having solid vanes including the steps of: rotating the expansion wheel of a hot gas expander by passing hot gas therethrough; supplying a cooling media to the inlet end of each vane of the rotating expansion wheel; distributing the cooling media in the direction of hot gas flow over the inlet end of each vane of the expansion wheel for essentially the full height of the vane; supplying the cooling media to the base of the pressure side of each vane at least over the inducer portion of each vane; and distributing the cooling media over the pressure side of each vane at least over the inducer portion whereby film cooling of the hot gas expander is achieved with minimal cooling of the hot gas.