# US 2021/0340875 A1 · Wheel of a fluid flow machine

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- Number: US 2021/0340875 A1
- Document ID: US20210340875A1
- Status: Published application
- Kind: A1
- Application number: 17/376,632
- Filed: 2021-07-15
- Published: 2021-11-04
- Earliest claimed: 2018-08-14
- Assignees: Rolls-Royce Deutschland Ltd & Co KG; ROLLS-ROYCE plc
- Applicants: Rolls-Royce Deutschland Ltd & Co KG; Rolls-Royce plc
- Inventors: Sven SCHRAPE; Bernhard MÜCK; Jens NIPKAU; Thomas GIERSCH; Frank HEINICHEN; John DODDS
- Web page: https://patentgrep.com/patent/US20210340875A1

## CPC

- F01D 9/041: {using blades (F01D5/148 takes precedence)}
- F04D 29/324: {Blades}
- F01D 5/141: {Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147)}
- F01D 5/16: for counteracting blade vibration
- F04D 29/544: {Blade shapes}
- F04D 29/563: {specially adapted for elastic fluid pumps}
- F04D 29/666: {by means of rotor construction or layout, e.g. unequal distribution of blades or vanes}
- F04D 29/668: {damping or preventing mechanical vibrations}
- F01D 17/16: by means of nozzle vanes
- F01D 17/162: {for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line (F01D17/167 takes precedence)}
- F01D 17/167: {of vanes moving in translation}
- F05D 2240/10: Stators
- F05D 2240/125: related to the tip of a stator vane
- F05D 2240/24: for turbines
- F05D 2250/38: angled, e.g. sweep angle
- F05D 2250/73: asymmetric
- F05D 2250/90: Variable geometry
- F05D 2260/70: Adjusting of angle of incidence or attack of rotating blades
- F05D 2260/961: by mistuning rotor blades or stator vanes with irregular interblade spacing, airfoil shape
- F05D 2270/101: Compressor surge or stall
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A blade wheel of a turbomachine, which blade wheel has a multiplicity of blades which are suitable and provided for extending radially in a flow path of the turbomachine, wherein the blades form a blade entry angle and a blade exit angle. Provision is made whereby the blade wheel forms N blocks of blades, where N≥2, wherein the blades of a block have in each case the same blade entry angle and the same blade exit angle, and the blades of at least two mutually adjacent blocks have a different blade entry angle and/or a different blade exit angle. According to a further aspect of the invention, partial gaps that the blades form in relation to an adjacent flow path boundary are varied in mutually adjacent blocks.

## Claims

### Claim at position 1

-28. (canceled)

### Claim 29

A blade wheel of a turbomachine, which blade wheel has:
a multiplicity of guide blades which are suitable and provided for extending in a flow path of the turbomachine, which flow path is delimited radially at the outside by an outer flow path boundary and radially at the inside by an inner flow path boundary, wherein the guide blades are designed to be adjustable in terms of their stagger angle,
wherein the guide blades have first partial gaps with respect to the outer flow path boundary and/or second partial gaps with respect to the inner flow path boundary,
wherein the first partial gaps and the second partial gaps in each case extend not over the entire axial length of the guide blades but only over a partial length,
wherein
the blade wheel forms N blocks of blades, where N≥2, wherein
the guide blades of a block have in each case identically formed partial gaps, and
the guide blades of at least two mutually adjacent blocks have differently formed partial gaps.

### Claim 30 (depends on 29)

The blade wheel according to claim 29, wherein the guide blades of at least two mutually adjacent blocks have partial gaps which have a different axial length.

### Claim 31 (depends on 29)

The blade wheel according to claim 29, wherein the guide blades of at least two mutually adjacent blocks have partial gaps which have a different radial height.

### Claim 32 (depends on 29)

The blade wheel according to claim 29, wherein the guide blades of at least two mutually adjacent blocks have partial gaps which have a different axial length and a different radial height.

### Claim 33 (depends on 29)

The blade wheel according to claim 29, wherein the partial gaps are formed by cut-backs that the guide blades form in relation to the adjacent flow path boundary.

### Claim 34 (depends on 29)

A blade wheel arrangement for a compressor of a turbomachine, which blade wheel arrangement has:
a first blade wheel, which is formed as a rotor,
a second blade wheel, which is arranged upstream of the first blade wheel and which is formed as a stator, and
a third blade wheel, which is arranged downstream of the first blade wheel and which is formed as a stator,
wherein
the second blade wheel and/or the third blade wheel is formed as a blade wheel according to claim 29.

### Claim 35 (depends on 34)

The blade wheel arrangement according to claim 34, wherein the second blade wheel and the third blade wheel are formed as blade wheels, wherein the two blade wheels form the same number of N blocks of blades, where N≥2.

### Claim 36 (depends on 35)

The blade wheel arrangement according to claim 35, wherein the second blade wheel is formed as an inlet stator, and a block of the second blade wheel, in which the gap volume of the partial gaps is relatively large, is assigned a block of the third blade wheel, in which the gap volume of the partial gaps is relatively small, and vice versa.

### Claim 37 (depends on 35)

The blade wheel arrangement according to claim 35, wherein the second blade wheel is formed as a stator embedded into a compressor, and a block of the second blade wheel, in which the gap volume of the partial gaps is relatively small, is assigned a block of the third blade wheel, in which the gap volume of the partial gaps is likewise relatively small, and a block of the second blade wheel, in which the gap volume of the partial gaps is relatively large, is assigned a block of the third blade wheel, in which the gap volume of the partial gaps is likewise relatively large.