Localized arc filament plasma actuators for noise mitigation and mixing enhancement
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02K-001/46
F02K-001/00
F01D-025/30
F01D-025/00
출원번호
US-0932325
(2004-09-01)
등록번호
US-7334394
(2008-02-26)
발명자
/ 주소
Samimy,Mohammad
Adamovich,Igor
출원인 / 주소
The Ohio State University
대리인 / 주소
Dinsmore & Shohl LLP
인용정보
피인용 횟수 :
11인용 특허 :
8
초록▼
A device for controlling fluid flow. The device includes an arc generator coupled to electrodes. The electrodes are placed adjacent a fluid flowpath such that upon being energized by the arc generator, an arc filament plasma adjacent the electrodes is formed. In turn, this plasma forms a localized h
A device for controlling fluid flow. The device includes an arc generator coupled to electrodes. The electrodes are placed adjacent a fluid flowpath such that upon being energized by the arc generator, an arc filament plasma adjacent the electrodes is formed. In turn, this plasma forms a localized high temperature, high pressure perturbation in the adjacent fluid flowpath. The perturbations can be arranged to produce vortices, such as streamwise vortices, in the flowing fluid to control mixing and noise in such flows. The electrodes can further be arranged within a conduit configured to contain the flowing fluid such that when energized in a particular frequency and sequence, can excite flow instabilities in the flowing fluid. The placement of the electrodes is such that they are unobtrusive relative to the fluid flowpath being controlled.
대표청구항▼
We claim: 1. An exhaust system comprising: an exhaust duct defining an exhaust stream flowpath surface therein; and an arc generator cooperative with said exhaust duct such that upon activation of said arc generator during the flow of an exhaust stream, arc filament plasma is formed that produces a
We claim: 1. An exhaust system comprising: an exhaust duct defining an exhaust stream flowpath surface therein; and an arc generator cooperative with said exhaust duct such that upon activation of said arc generator during the flow of an exhaust stream, arc filament plasma is formed that produces a localized perturbation in a portion of said exhaust stream, said arc generator comprising: an energy source; and a plurality of electrodes coupled to said energy source, said electrodes disposed adjacent a trailing edge of said exhaust duct and configured such that said electrodes do not substantially protrude into said exhaust stream, said electrodes arranged such that said localized perturbation generates streamwise vorticity in said portion of said exhaust stream, such that said electrodes generate localized perturbations that are within the range of the exhaust jet instability frequencies. 2. The exhaust system of claim 1, wherein said electrodes are configured in at least one circumferential row about said exhaust duct. 3. The exhaust system of claim 1, wherein at least a portion of said exhaust stream flowpath surface is comprised of a refractory material. 4. The exhaust system of claim 3, wherein said refractory material comprises at least one of a ceramic or a ceramic composite. 5. The exhaust system of claim 1, further comprising a coolant supply placed in heat exchange relationship with said duct. 6. The exhaust system of claim 1, wherein said electrodes are disposed in said exhaust duct to define a substantially flush fit with said exhaust stream flowpath surface. 7. The exhaust system of claim 6, wherein said electrodes are configured in a plurality of rows such that each successive row is axially downstream in said exhaust duct relative to its immediately preceding row. 8. The exhaust system of claim 1, wherein said exhaust duct is substantially axisymmetric. 9. The exhaust system of claim 1, wherein said exhaust duct is substantially non-axisymmetric. 10. The exhaust system of claim 9, wherein said substantially non-axisymmetric duct is rectangular. 11. The exhaust system of claim 1, wherein said electrodes are arranged around a substantial periphery of said exhaust stream flowpath surface. 12. The exhaust system of claim 11, further comprising a controller coupled to said arc generator, said controller configured to energize said electrodes according to a predetermined frequency and sequence in order to excite at least one flow instability in said exhaust stream. 13. The exhaust system of claim 12, wherein said generation of said localized perturbations at said electrodes occurs staggered time intervals to excite azimuthal modes of the exhaust system. 14. The exhaust system of claim 12, wherein said generation of said localized perturbations at said electrodes occurs simultaneously to excite axisymmetric mode of the exhaust system. 15. The exhaust system of claim 1, wherein at least a portion of said electrodes are grouped such that each group defines an actuator, said actuator configured to produce said arc filament plasma that produces said localized perturbation. 16. The exhaust system of claim 15, wherein said each group comprises a group of two of said electrodes. 17. The exhaust system of claim 1, wherein said energy source is an electric current source. 18. The exhaust system of claim 1, further comprising, a gas generator configured to supply said exhaust system with said exhaust stream. 19. The exhaust system of claim 18, wherein said gas generator is a gas turbine engine comprising: a compressor or compressors; a combustor or combustors in fluid communication with said compressor; and a turbine or turbines fluidly disposed between said combustor and said exhaust system, said turbine rotationally cooperative with said compressor. 20. The exhaust system of claim 18, wherein a plurality of said electrodes are electrically coupled to a common ground electrode. 21. The exhaust system of claim 1, wherein said exhaust duct further comprises a core exhaust duct with at least one of said arc generator disposed therein, and a bypass exhaust duct disposed concentrically around said core exhaust duct, said bypass exhaust duct with at least another of said arc generator disposed therein, each of said one and another arc generators configured to selectively operate to produce said localized perturbation within a respective one of said ducts.
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이 특허에 인용된 특허 (8)
Friedrich Thomas E. (7 Egerton Place London ; S.W.3 GBX), Arrangement for suppressing jet engine noise.
Roth John R. (Knoxville TN) Tsai Peter P. (Knoxville TN) Liu Chaoyu (Knoxville TN) Laroussi Mounir (Knoxville TN) Spence Paul D. (Knoxville TN), One atmosphere, uniform glow discharge plasma.
Kopiev, Victor Feliksovitch; Ostrikov, Nikolay Nikolayevich; Zaytsev, Mikhail Yuryevich; Chernyshev, Sergey Anatoliyevich, Device and method for controlling vortex structures in a turbulent air jet.
Ginn, Kerry B.; Jenkins, Stewart A.; Wells, David M.; McCallum, Brent N., Nozzle plasma flow control utilizing dielectric barrier discharge plasma actuators.
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