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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...
Characterization and Control of Inlet Nacelle Flow in the Presence of Crosswind and Ground Effect

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105330
ISBN  
9798263325558
DDC  
530
저자명  
Nichols, Derek Ashton.
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  
Aircraft propulsion systems
키워드  
Velocity
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■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.

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