# US 2014/0154069 A1 · Turbine wheel, a turbine and use thereof

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- Number: US 2014/0154069 A1
- Document ID: US20140154069A1
- Status: Published application
- Kind: A1
- Application number: 14/001,230
- Filed: 2012-02-02
- Published: 2014-06-05
- Earliest claimed: 2011-02-24
- Assignees: Imperial Innovations Limited
- Inventors: Ricardo Fernando Martinez-Botas Mateo; Alessandro Romagnoli; Aman Mohd Ihsan Bin Mamat
- Web page: https://patentgrep.com/patent/US20140154069A1

## CPC

- F01D 5/12: 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)
- F01D 5/141: {Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147)}
- F01D 5/143: {Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour}
- F05D 2210/43: Radial inlet and axial outlet
- F05D 2220/40: in turbochargers
- F05D 2240/301: Cross-sectional characteristics
- Y02T 10/12: Improving ICE efficiencies
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A turbine wheel for low-pressure ratio applications is disclosed. The ratio of the outlet area of the wheel (A2) to the inlet area of the wheel (A1) is less than approximately 0.4. In an embodiment, the wheel is a radial or mixed-flow wheel.

## Claims

### Claim 1

A turbine wheel for low pressure ratio applications, wherein the ratio of the outlet area of the wheel (A2) to the inlet area of the wheel (A1) is less than approximately 0.4.

### Claim 2 (depends on 1)

A turbine wheel according to claim 1, wherein the ratio of A2/A1 is between approximately 0.3 and approximately 0.4.

### Claim 3 (depends on 1)

A turbine wheel according to claim 1, 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 less than approximately 0.7.

### Claim 4 (depends on 1)

A turbine wheel according to claim 1, 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 approximately 0.2 and approximately 0.7.

### Claim 5 (depends on 1)

A turbine wheel according to claim 1, wherein 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 approximately 1.0.

### Claim 6 (depends on 1)

A turbine wheel according to claim 1, wherein 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 approximately 0.6 and approximately 0.9.

### Claim 7 (depends on 1)

A turbine wheel according to claim 1, wherein the exit relative flow angle is less than approximately −55 degrees.

### Claim 8 (depends on 1)

A turbine wheel according to claim 1, wherein the exit relative flow angle is between approximately −41 degrees and approximately −55 degrees.

### Claim 9 (depends on 1)

A turbine wheel according to claim 1 and further being a radial-flow turbine wheel.

### Claim 10 (depends on 1)

A turbine wheel according to of claim 1 and further being a mixed-flow turbine wheel.

### Claim 11 (depends on 1)

A turbine comprising a turbine wheel 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.

### Claim 12 (depends on 11)

A turbine according to claim 11, wherein the ratio of the radius (R3) of a hub of the turbine wheel adjacent the outlet to the radius (R4) of the outlet defined by the shroud is less than approximately 0.7.

### Claim 13 (depends on 11)

A turbine according to claim 11, wherein the ratio of the radius (R4) of the outlet defined by the shroud to the radius (R1) of the inlet defined by the shroud is less than approximately 1.0.

### Claim 14 (depends on 11)

A turbocompound unit comprising a turbine according to any claim 11.

### Claim 15 (depends on 11)

An exhaust system comprising a turbine according to claim 11.

### Claim 16 (depends on 1)

Use of a turbine wheel according to claim 1 in a flow with a pressure ratio of less than approximately 1.2.

### Claim 17 (depends on 16)

Use according to claim 16, wherein the pressure ratio is between approximate 1.02 and approximately 1.2.

### Claim 18 (depends on 11)

A turbine according to claim 11, wherein the ratio of the radius (R3) of a hub of the turbine wheel adjacent the outlet to the radius (R4) of the outlet defined by the shroud is between approximately 0.2 and approximately 0.7.

### Claim 19 (depends on 11)

A turbine according to claim 11 wherein the ratio of the radius (R4) of the outlet defined by the shroud to the radius (R1) of the inlet defined by the shroud is between approximately 0.6 and approximately 0.9.

### Claim 20 (depends on 13)

A turbocompound unit according to claim 13.