Two phase flow turbine

F - Mech Eng,Light,Heat,Weapons – 25 – B

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F25B 11/02 (2006.01) F03B 13/00 (2006.01)

Patent

CA 2144492

A single-fluid two-phase turbine expander is employed in a compression-expansion refrigeration system. The turbine expander has its rotor mechanically coupled to the drive train of the associated refrigeration compressor, which can be a high-speed centrifugal compressor or a geared screw compressor. The turbine is a straight-forward design, with a rotor disk having peripheral vanes, and a nozzle block that houses the disk and contains a group of nozzles that are directed at the vanes. The nozzles each have an inlet orifice plate and a converging/diverging internal geometry that permits supersonic discharge. The vanes are shaped for impulse reaction and have a sharp exit bend to prevent further flashing of the two-phase mixture in the rotor.

Détendeur à turbine à deux phases monofluide utilisé dans un système frigorifique à compression-expansion. Il comprend un rotor couplé de façon mécanique au mécanisme de transmission du compresseur pour système frigorifique correspondant, qui peut être un compresseur centrifuge à vitesse élevée ou un compresseur à vis. La turbine est de simple conception, avec un disque rotor à aubes périphériques et un porte-buses qui loge le disque et contient un groupe de buses qui sont dirigées vers les aubes. Les buses ont chacune une plaque d'ouverture d'entrée et une géométrie interne convergente/divergente qui permet un refoulement supersonique. Les aubes sont formées pour une réaction d'impulsion et ont un coude de sortie aigu pour empêcher d'autre flash de changement de phase dans le mélange à deux phases du rotor.

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