Apparatus and method for heating an aircraft structure
US-2019263529-A1 · Aug 29, 2019 · US
Active flow control for ducted fans and fan-in-wing configurations
US11485486B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11485486-B2 |
| Application number | US-201715596170-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 16, 2017 |
| Priority date | May 18, 2016 |
| Publication date | Nov 1, 2022 |
| Grant date | Nov 1, 2022 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
Systems, methods, lift fans, and aircraft involving active flow control of a ducted fan or fan-in-wing configuration are described.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of conducting active flow control in a ducted fan or fan-in-wing aircraft having a fan within a duct defining a duct wall, the method comprising: actively sucking air through one or more suction outlets in the duct wall from a position relative to a blade tip of a rotatable blade of the fan, wherein the position is in a diffuser section of the duct under a plane defined by rotation of the blade at a quarter chord point of the blade tip and disposed at a distance from the plane approximately equal to a distance between a leading edge of the blade tip and a trailing edge of the blade tip; and directing the sucked air to an exit of the duct at a trailing edge of the duct; wherein the sucking is conducted at a suction speed within 15% of a speed of the blade tip. 2. The method of claim 1 , wherein the step of actively sucking air includes semi-annulus air extraction, wherein the air is actively sucked from a windward side of the duct only under the blade. 3. The method of claim 1 , wherein the step of actively sucking air includes full-annulus air extraction, wherein the air is actively sucked from a full annulus of the duct under the blade. 4. A method of conducting active flow control in a ducted fan or fan-in-wing aircraft having a fan within a duct defining a duct wall, the method comprising: passively or actively removing air from a position relative to a blade tip of a rotatable blade of the fan through one or more suction outlets in the duct wall, wherein the position is in a diffuser section of the duct under a plane defined by rotation of the blade at a quarter chord point of the blade tip and disposed at a distance from the plane approximately equal to a distance between a leading edge of the blade tip and a trailing edge of the blade tip; wherein the method comprises a combination of semi-annulus air extraction with zero-net mass flow and full-annulus air extraction with zero-net mass flow, wherein: in forward flight, the air is actively removed semi-annulusly from a windward side of the duct only under the blade, and is directed to an exit of the duct, and in hover, the air is actively removed in a full annulus of the duct under the blade, and is directed to an exit of the duct.
Assignees
Inventors
Classifications
at propeller or rotor blades · CPC title
Drag reduction · CPC title
the propellers being fixed relative to the fuselage · CPC title
- B64C11/001Primary
Shrouded propellers · CPC title
by actively generating fluid flow · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11485486B2 cover?
- Systems, methods, lift fans, and aircraft involving active flow control of a ducted fan or fan-in-wing configuration are described.
- Who is the assignee on this patent?
- Univ Toledo
- What technology area does this patent fall under?
- Primary CPC classification B64C11/001. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Nov 01 2022 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 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).