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Transitory Fluidic Aerodynamic Control of Attached and Stalled Flows Over an Airfoil
Transitory Fluidic Aerodynamic Control of Attached and Stalled Flows Over an Airfoil
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105514
- ISBN
- 9798263336882
- DDC
- 300
- 저자명
- Tan, Yuehan.
- 서명/저자
- Transitory Fluidic Aerodynamic Control of Attached and Stalled Flows Over an Airfoil
- 발행사항
- [Sl] : Georgia Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 186 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Glezer, Ari.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
- 초록/해제
- 요약The aerodynamic characteristics of an airfoil are modified using active fluidicbased control over a range of angles of attack in the absence and presence of stall. The transitory characteristics of the flow under actuation are investigated using time-resolved measurements of the aerodynamic loads with emphasis on the temporal response following the onset and termination of the actuation along with corresponding measurements of the unsteady velocity fields using phase-locked particle image velocimetry (PIV). The first part of this dissertation focuses on mitigation of static and dynamic stall at moderate to high angles of attack using pulsed actuation near the leading-edge by combustion-powered actuators. It is shown that actuation on static and pitching/plunging models effects rapid increases in lift performance and improved damping stability. PIV measurements phaselocked to the pitching motion reveal that upstroke actuation affects the development of the dynamic stall vortex, while downstroke actuation accelerates boundary layer reattachment. The second part of the dissertation extends the application of active flow control to moderate and low angles of attack when the base flow is attached for time-dependent, bidirectional regulation of the aerodynamic loads using independently-controlled highaspect-ratio spanwise trailing-edge actuation jets on the pressure and suction sides. It is shown that pulsed jet actuation on the pressure and suction surfaces leads to rapid bidirectional changes in lift with characteristic response time O[Tconv], along with reduction in drag. Phase-locked velocity measurements near the trailing-edge demonstrate bidirectional cross-stream transport of vorticity concentrations, modification of the trailingedge Kutta condition, and the temporal manipulation of vorticity flux into the near wake.
- 일반주제명
- Load
- 일반주제명
- Pressure distribution
- 일반주제명
- Vortices
- 일반주제명
- Aerodynamics
- 일반주제명
- Aerospace engineering
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105514
■006m o d
■007cr#unu||||||||
■020 ▼a9798263336882
■035 ▼a(MiAaPQ)AAI32309265
■035 ▼a(MiAaPQ)GeorgiaTech75181
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a300
■1001 ▼aTan, Yuehan.
■24510▼aTransitory Fluidic Aerodynamic Control of Attached and Stalled Flows Over an Airfoil
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a186 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Glezer, Ari.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2024.
■520 ▼aThe aerodynamic characteristics of an airfoil are modified using active fluidicbased control over a range of angles of attack in the absence and presence of stall. The transitory characteristics of the flow under actuation are investigated using time-resolved measurements of the aerodynamic loads with emphasis on the temporal response following the onset and termination of the actuation along with corresponding measurements of the unsteady velocity fields using phase-locked particle image velocimetry (PIV). The first part of this dissertation focuses on mitigation of static and dynamic stall at moderate to high angles of attack using pulsed actuation near the leading-edge by combustion-powered actuators. It is shown that actuation on static and pitching/plunging models effects rapid increases in lift performance and improved damping stability. PIV measurements phaselocked to the pitching motion reveal that upstroke actuation affects the development of the dynamic stall vortex, while downstroke actuation accelerates boundary layer reattachment. The second part of the dissertation extends the application of active flow control to moderate and low angles of attack when the base flow is attached for time-dependent, bidirectional regulation of the aerodynamic loads using independently-controlled highaspect-ratio spanwise trailing-edge actuation jets on the pressure and suction sides. It is shown that pulsed jet actuation on the pressure and suction surfaces leads to rapid bidirectional changes in lift with characteristic response time O[Tconv], along with reduction in drag. Phase-locked velocity measurements near the trailing-edge demonstrate bidirectional cross-stream transport of vorticity concentrations, modification of the trailingedge Kutta condition, and the temporal manipulation of vorticity flux into the near wake.
■590 ▼aSchool code: 0078.
■650 4▼aLoad
■650 4▼aPressure distribution
■650 4▼aVortices
■650 4▼aAerodynamics
■650 4▼aAerospace engineering
■690 ▼a0538
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360367▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
