Jet exhaust noise reduction
US-9261047-B2 · Feb 16, 2016 · US
Passive edge-tone suppression method
US9488129B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-9488129-B1 |
| Application number | US-201514711697-A |
| Country | US |
| Kind code | B1 |
| Filing date | May 13, 2015 |
| Priority date | May 13, 2015 |
| Publication date | Nov 8, 2016 |
| Grant date | Nov 8, 2016 |
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- Title
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Abstract
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The passive edge-tone suppression method includes the step of inserting a central insertion tube within a nozzle to disturb jet oscillations in a flow field of an edge-tone feedback loop. The central insertion tube can have a diameter of 200 micrometers and can be inserted within a center of the nozzle. The method also includes the step of extending the central insertion tube through the nozzle and into an alignment with the edge producing the edge tone. Further, the method includes the step of increasing a length of the central insertion tube in relation to a stand-off distance between the nozzle and the edge. The length of the central insertion tube can be increased to a length of about 30 percent of the stand-off distance.
First claim
Opening claim text (preview).
We claim: 1. A passive edge-tone suppression method, comprising the steps of: inserting a central insertion tube within a nozzle ejecting a jet, wherein the central insertion tube is imperforate, being devoid of microjets; extending the central insertion tube through the nozzle and into alignment with an edge disposed in the path of the jet; and selecting the central insertion tube so that the central insertion tube has a length of about 30 percent of a stand-off distance between the nozzle and the edge. 2. The passive edge-tone suppression method according to claim 1 , wherein the central insertion tube is inserted within a center of the nozzle. 3. The passive edge-tone suppression method according to claim 1 , wherein the central insertion tube has a diameter of about 200 micrometers.
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Classifications
Preventing, counteracting or reducing vibration or noise · CPC title
for aircraft propulsion, e.g. jet engines · CPC title
Nozzles · CPC title
- F02K1/44Primary
Nozzles having means, e.g. a shield, reducing sound radiation in a specified direction (F02K1/40 takes precedence) · CPC title
for attenuating noise · CPC title
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- What does patent US9488129B1 cover?
- The passive edge-tone suppression method includes the step of inserting a central insertion tube within a nozzle to disturb jet oscillations in a flow field of an edge-tone feedback loop. The central insertion tube can have a diameter of 200 micrometers and can be inserted within a center of the nozzle. The method also includes the step of extending the central insertion tube through the nozzle…
- Who is the assignee on this patent?
- Univ King Fahd Pet & Minerals
- What technology area does this patent fall under?
- Primary CPC classification F02K1/44. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Nov 08 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).