Turbine wheel, a turbine and use thereof

Patent metadata

Field	Value
Publication number	US-9708913-B2
Application number	US-201214001230-A
Country	US
Kind code	B2
Filing date	Feb 2, 2012
Priority date	Feb 24, 2011
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A turbine wheel for low-pressure ratio applications is disclosed. The ratio of the outlet area of the wheel (A 2 ) to the inlet area of the wheel (A 1 ) is less than approximately 0.4. In an embodiment, the wheel is a radial or mixed-flow wheel.

First claim

What is claimed is:

1. An exhaust system for a vehicle comprising:
a turbocharger; and
a turbocompound unit comprising a turbine downstream of the turbocharger, wherein the turbine is configured to operate with an inlet to outlet pressure ratio between 1.02 and 1.2 and comprises:
a turbine wheel for low pressure ratio applications, wherein the ratio of the outlet area of the wheel (A 2 ), the outlet area defined as the area described by rotating a first edge of a blade of the turbine wheel about the axis, the first edge being an edge arranged to be adjacent an outlet, to the inlet area of the wheel (A 1 ), the inlet area defined as the area described by rotating a second edge of the blade of the turbine wheel about the axis, the second edge being an edge arranged to be adjacent an inlet, is between 0.3 and 0.4, wherein the ratio of the radius of the root of the blades adjacent the outlet to the radius of the tip of the blades adjacent the outlet is between 0.2 and 0.7.

2. The exhaust system according to claim 1 , wherein a ratio of the radius of the tip of the blades adjacent the outlet to the radius of the tip of the blades adjacent the inlet is less than 1.0.

3. The exhaust system according to claim 1 , wherein a ratio of the radius of the tip of the blades adjacent the outlet to the radius of the tip of the blades adjacent the inlet is between 0.6 and 0.9.

4. The exhaust system according to claim 1 , wherein the exit relative flow angle is less than −55 degrees.

5. The exhaust system according to claim 1 , wherein the exit relative flow angle is between −41 degrees and −55 degrees.

6. The exhaust system according to claim 1 and further being a radial-flow turbine wheel.

7. The exhaust system according to claim 1 and further being a mixed-flow turbine wheel.

8. The exhaust system according to claim 1 and further comprising a shroud at least partly covering the turbine wheel to define an inlet and an outlet of the turbine.

9. The exhaust system according to claim 1 , wherein a ratio of a radius (R 3 ) of a hub of the turbine wheel adjacent the outlet to a radius (R 4 ) of the outlet defined by the shroud is less than 0.7.

10. The exhaust system according to claim 1 , wherein a ratio of a radius (R 4 ) of the outlet defined by the shroud to a radius (R 1 ) of the inlet defined by the shroud is less than 1.0.

11. A turbine according to claim 8 , wherein a ratio of a radius (R 3 ) of a hub of the turbine wheel adjacent the outlet to a radius (R 4 ) of the outlet defined by the shroud is between 0.2 and 0.7.

12. A turbine according to claim 8 wherein a ratio of a radius (R 4 ) of the outlet defined by the shroud to a radius (R 1 ) of the inlet defined by the shroud is between 0.6 and 0.9.

Assignees

• Martinez-Botas Mateo Ricardo Fernando
• Romagnoli Alessandro
• Bin Mamat Aman Mohd Ihsan
• Imp Innovations Ltd

Inventors

• Martinez-Botas Mateo Ricardo Fernando
• Romagnoli Alessandro
• Bin Mamat Aman Mohd Ihsan

Classifications

• F05D2240/301

  Cross-sectional characteristics · CPC title

• F01D5/12 Primary

  Blades ({specially adapted for radial flow machines or engines F01D5/04}; blade roots F01D5/30; rotors with blades adjustable in operation F01D7/00; stator blades F01D9/02) · CPC title

• F01D5/143

  Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour · CPC title

• F05D2210/43

  Radial inlet and axial outlet · CPC title

• F01D5/141 Primary

  Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147) · CPC title