Group of blade rows
US-9822645-B2 · Nov 21, 2017 · US
Blade group arrangement as well as turbomachine
US9470091B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9470091-B2 |
| Application number | US-201313760580-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 6, 2013 |
| Priority date | Feb 10, 2012 |
| Publication date | Oct 18, 2016 |
| Grant date | Oct 18, 2016 |
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- Title
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Abstract
Official abstract text for this publication.
A blade group arrangement for a turbomachine in order to form a blade-row group, whereby a front blade and a rear blade each form an overlapping area that has a contraction ratio of at least 1.2, and it also relates to a turbomachine having such a contraction ratio between a front blade and a rear blade.
First claim
Opening claim text (preview).
What is claimed is: 1. A blade group arrangement for a turbomachine in order to form a blade-row group, comprising: a front blade and a rear blade arranged offset from each other in the axial and circumferential directions and forming an overlapping area running between a pressure side of the front blade and a suction side of the rear blade, the front and rear blades in the overlapping area converging with a contraction ratio KV of KV≧1.2 between an inlet surface D min,1 defined as a smallest distance between a leading edge of the rear blade and the pressure side of the front blade, and an outlet surface D min,2 defined as a further smallest distance between the suction side of the rear blade and the pressure side of the front blade. 2. The blade group arrangement as recited in claim 1 wherein the contraction ratio KV is ≦2.8. 3. The blade group arrangement as recited in claim 1 wherein the contraction ratio KV=1.7. 4. The blade group arrangement as recited in claim 1 wherein the suction side of the rear blade has a greater curvature downstream from the outlet surface D min,2 than upstream from the outlet surface D min,2 . 5. The blade group arrangement as recited in claim 4 wherein the curvature has a maximum ranging from 1.6 to 1.7 times a mean curvature of the suction side of the rear blade. 6. The blade group arrangement as recited in claim 5 wherein the curvature maximum amounts to approximately 5% to 25% of a relative skeleton line length behind the outlet surface D min,2 . 7. A turbomachine comprising at least one blade-row group having a plurality of blade group arrangements as recited in claim 1 .
Assignees
Inventors
Classifications
Blades · CPC title
specially adapted for elastic fluid pumps · CPC title
using blades (F01D5/148 takes precedence) · CPC title
Bladed diffusers (fixing blades to stators F01D9/042) · CPC title
- F01D5/022Primary
with concentric rows of axial blades · CPC title
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- What does patent US9470091B2 cover?
- A blade group arrangement for a turbomachine in order to form a blade-row group, whereby a front blade and a rear blade each form an overlapping area that has a contraction ratio of at least 1.2, and it also relates to a turbomachine having such a contraction ratio between a front blade and a rear blade.
- Who is the assignee on this patent?
- Mtu Aero Engines Gmbh
- What technology area does this patent fall under?
- Primary CPC classification F01D5/022. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Oct 18 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).