# US 9,435,207 B2 · Blade comprising pre-wired sections

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- Number: US 9,435,207 B2
- Document ID: US9435207B2
- Status: Granted
- Kind: B2
- Application number: 13/581,275
- Filed: 2011-01-29
- Published: 2012-12-13
- Granted: 2016-09-06
- Earliest claimed: 2010-02-27
- Assignees: MTU Aero Engines AG
- Applicants: Sergio Elorza Gomez; Peter Eibelshaeuser
- Inventors: Sergio Elorza Gomez; Peter Eibelshaeuser
- Web page: https://patentgrep.com/patent/US9435207B2

## CPC

- F01D 5/141: {Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147)}
- F05D 2200/26: trigonometric
- Y10T 29/49337: Composite blade
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A blade for a blade row of a turbomachine having wired sections, in particular a blade of a compressor rotor blade, as well as a method for wiring sections of such a blade, is disclosed. Sections of a blade are wired in such a way that a first central component of a second section is selected according to at least one central component of a first section.

## Claims

### Claim 1

A method for forming a blade (1) for a blade row of a turbomachine, comprising:
selecting a first central component (ΘCG(i+1)) of a second section ((i+1)) of the blade according to at least one central component (ΘCG(i), xCG(i), rCG(i)) of a first section ((i)) of the blade;
wherein the first central component (ΘCG(i+1)) of the second section ((i+1)) is selected as a first central component in a peripheral direction essentially according to:
Θ
CG
⁡
(
i
+
1
)
=
Θ
CG
⁡
(
i
)
+
Arctan
⁢
⌊
A
·
(
x
CG
⁡
(
i
+
1
)
-
x
CG
⁡
(
i
)
)
·
tan
⁢
⁢
B
⌋
+
C
with
A
∈
{
2
(
r
CG
⁡
(
i
+
1
)
+
R
CG
⁡
(
i
)
)
,
1
r
CG
⁡
(
i
)
,
1
r
CG
⁡
(
i
+
1
)
}
;
B
∈
{
β
(
i
+
1
)
+
β
(
i
)
2
,
β
(
i
)
,
β
(
i
+
1
)
}
;
C
∈
{
Arcsin
⁡
[
(
r
CG
⁡
(
i
+
1
)
-
r
CG
⁡
(
1
)
)
(
r
CG
⁡
(
i
+
1
)
)
·
sin
⁡
(
Θ
lean
)
]
,
0
}
where:
(i) is a variable of the first section;
(i+1) is a variable of the second section;
ΘCG is a central component of a section in the peripheral direction;
xCG is a central component of a section in an axial direction;
rCG is a central component of a section in a radial direction;
β is a graduated angle of a section; and
Θlean is a peripheral incline; and
forming the blade by wiring the first section and the second section of the blade.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a central peripheral position (ΘCG(i+1)) for all sections ((i+1)) is selected according to
ΘCG(i+1)=ΘCG(l)+Arctan└A·(xCG(i+1)−xCG(i))·tan B┘+C
for which a difference (rCG(I+1)−rCG(l)) between the central component thereof and a central component in the radial direction of a radially inward channel base is at least 35% of a channel height of the blade row.