Nozzled turbine

摘要

A turbine includes a turbine housing having two gas passages of substantially the same flow area. A nozzle ring is disposed in the housing and around the turbine wheel. The nozzle ring includes first and second outer rings, and an inner ring disposed between the first and second outer rings. First and second pluralities of vanes are disposed between the rings. The second outer ring has a thicker cross section than the first outer ring such that a larger flow area is created between the first outer ring and the inner ring than a flow area created between the second outer ring and the inner ring.

主权项

1. A nozzle ring adapted for installation into a receiving bore in a turbine housing, the turbine housing having two flow passages having the same flow area formed therewithin and separated by a divider wall, each flow passage being connected to a respective gas inlet, the receiving bore surrounding a turbine wheel when the turbine housing is assembled into a turbocharger, the nozzle ring comprising:
a first outer ring; an inner ring disposed adjacent the first outer ring, said inner ring having an annular shape and disposed in axial alignment with the divider wall, a second outer ring disposed adjacent the inner ring, said second outer ring having a thicker cross section than the first outer ring; a first plurality of vanes fixedly disposed between the first outer ring and the inner ring, the first plurality of vanes defining a first plurality of inlet openings therebetween that are in fluid communication with a slot formed in the nozzle ring and adapted to surround the turbine wheel; a second plurality of vanes fixedly disposed between the second outer and the inner rings, the second plurality of vanes defining a second plurality of inlet openings therebetween that are in fluid communication with the slot; wherein the first plurality of inlet openings collectively defines a first flow outlet area that is larger than a second flow outlet area collectively defined by the second plurality of inlet openings.