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Characterization and Control of Inlet Nacelle Flow in the Presence of Crosswind and Ground Effect
Characterization and Control of Inlet Nacelle Flow in the Presence of Crosswind and Ground Effect
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105330
- ISBN
- 9798263325558
- DDC
- 530
- 서명/저자
- Characterization and Control of Inlet Nacelle Flow in the Presence of Crosswind and Ground Effect
- 발행사항
- [Sl] : Georgia Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 241 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Glezer, Ari.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
- 초록/해제
- 요약Inlet nacelles of commercial aircraft propulsion systems are optimized for cruise but must also be designed to accommodate flight during takeoff/landing which can suffer from significantly impeded performance in the presence of crosswind. As the speed of the crosswind relative to the speed of the inlet flow reaches a critical magnitude, the flow over the nacelle's inlet surface can undergo separation leading to distortion which can hinder the engine thrust. Furthermore, the engine's performance and safety may be compromised by its proximity to the ground due to the formation of a ground vortex that is drawn into the engine which can lead to the ingestion of ground debris that may damage the fan blades. The first primary objective of this research is the elucidation and characterization of the fundamental mechanisms of the inlet flow and (1) the onset of separation with incident crosswind and (2) the formation and evolution of a ground vortex due to a ground plane. Of particular interest are the effects of these flow phenomena on the performance of the inlet as measured by flow recovery and distortion. The second objective is to investigate different approaches for control and mitigation of the adverse effects of flow separation and the ground vortex. Approaches for controlling separation are based on earlier work at Georgia Tech and elsewhere which uses fluidic actuation near the surface to alter the structure of the inlet boundary layer. These approaches are based on either distributed, surface-integrated actuation jet arrays or by exploiting autonomous bleed of air across the nacelle's surface. Autonomous bleed control is further used to control the external flow field to prevent the formation of the ground vortex. Through control, flights may become safer and more fuel-efficient aiding in the transition to a greener aerospace industry.
- 일반주제명
- Vortices
- 일반주제명
- Visualization
- 일반주제명
- Asymmetry
- 일반주제명
- Aerospace engineering
- 일반주제명
- Mechanical engineering
- 키워드
- Velocity
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105330
■006m o d
■007cr#unu||||||||
■020 ▼a9798263325558
■035 ▼a(MiAaPQ)AAI32307948
■035 ▼a(MiAaPQ)GeorgiaTech78532
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aNichols, Derek Ashton.
■24510▼aCharacterization and Control of Inlet Nacelle Flow in the Presence of Crosswind and Ground Effect
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a241 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Glezer, Ari.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2024.
■520 ▼aInlet nacelles of commercial aircraft propulsion systems are optimized for cruise but must also be designed to accommodate flight during takeoff/landing which can suffer from significantly impeded performance in the presence of crosswind. As the speed of the crosswind relative to the speed of the inlet flow reaches a critical magnitude, the flow over the nacelle's inlet surface can undergo separation leading to distortion which can hinder the engine thrust. Furthermore, the engine's performance and safety may be compromised by its proximity to the ground due to the formation of a ground vortex that is drawn into the engine which can lead to the ingestion of ground debris that may damage the fan blades. The first primary objective of this research is the elucidation and characterization of the fundamental mechanisms of the inlet flow and (1) the onset of separation with incident crosswind and (2) the formation and evolution of a ground vortex due to a ground plane. Of particular interest are the effects of these flow phenomena on the performance of the inlet as measured by flow recovery and distortion. The second objective is to investigate different approaches for control and mitigation of the adverse effects of flow separation and the ground vortex. Approaches for controlling separation are based on earlier work at Georgia Tech and elsewhere which uses fluidic actuation near the surface to alter the structure of the inlet boundary layer. These approaches are based on either distributed, surface-integrated actuation jet arrays or by exploiting autonomous bleed of air across the nacelle's surface. Autonomous bleed control is further used to control the external flow field to prevent the formation of the ground vortex. Through control, flights may become safer and more fuel-efficient aiding in the transition to a greener aerospace industry.
■590 ▼aSchool code: 0078.
■650 4▼aVortices
■650 4▼aVisualization
■650 4▼aAsymmetry
■650 4▼aAerospace engineering
■650 4▼aMechanical engineering
■653 ▼aAircraft propulsion systems
■653 ▼aVelocity
■690 ▼a0548
■690 ▼a0538
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360266▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
