TURBINE SHROUD CONTOUR EXDUCER RELIEF

摘要

A turbocharger turbine having a blade-gap zone between the blades and the shroud wall. The blade-gap zone is larger at and near the exducer than at an upstream location where the shroud wall is at its minimum radius. Also disclosed is a method of customizing and manufacturing a turbine by establishing an optimized blade-gap zone at the exducer, and machining it into a turbine housing.

主权项

1. A turbocharger turbine, comprising:
a turbine housing; a turbine wheel within the housing, the wheel being characterized by an axis of rotation about which the wheel rotates, and the wheel having a plurality of blades, each blade forming a leading edge, a trailing edge and an outer edge, the outer edge extending from the leading edge to the trailing edge, wherein the path traveled by the outer edges of the blades through a rotation of the wheel defines an axially symmetric, smoothly varying, axially concave, outer-blade effective surface; wherein the housing and the wheel define a fluid passageway serially including an inlet passageway upstream of the blades, an outlet passageway downstream of the blades, and a blade passageway that extends from the blade leading edges to the blade trailing edges, the blade passageway being defined on an outer side by a shroud wall of the housing; wherein a blade-gap zone is defined between the shroud wall and the outer-blade effective surface; wherein the shroud wall is characterized by a profile wherein a downstream portion of the shroud wall at the downstream end of the blade-gap zone is thicker at its downstream end than it is at its upstream end.