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An Experimental Characterization of a Multielement Lean Premixed Pre-Vaporized Combustor for Supersonic Transport Applications
An Experimental Characterization of a Multielement Lean Premixed Pre-Vaporized Combustor f...
An Experimental Characterization of a Multielement Lean Premixed Pre-Vaporized Combustor for Supersonic Transport Applications

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105826
ISBN  
9798263340544
DDC  
658
저자명  
Passarelli, Mitchell Louis.
서명/저자  
An Experimental Characterization of a Multielement Lean Premixed Pre-Vaporized Combustor for Supersonic Transport Applications
발행사항  
[Sl] : Georgia Institute of Technology, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
122 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: A.
주기사항  
Advisor: Steinberg, Adam M.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
초록/해제  
요약Recent trends have driven a re-emergence of research and development in aircraft engines for commercial supersonic transport (CST). Despite the vast body of literature that exists for gas turbine combustors operating at conditions relevant to conventional subsonic flight, there is little to validate extensions of this knowledge to the conditions encountered by CST engines. Further complications arise from advanced combustor designs that involve multiple different flames or flow devices. The interactions of such combustor elements can lead to individual behaviours that differ from that of single elements.The existing literature on flame and flow interactions is focused on conditions relevant to the operation of conventional, subsonic aircraft engines. While such works provide a baseline understanding of the physical phenomena involved in such interactions, they do not necessarily predict the behaviours exhibited by different combustor configurations and/or at different conditions. Some recent studies have employed numerical simulations to determine the characteristics of various combustor schemes, including lean direct injection and lean premixed pre-vaporized (LPP) designs. These studies are limited by the lack of empirical data for validation and model development.The work presented herein aims to characterize experimentally the flow field, flame dynamics and operating limits of a multi-element LPP combustor operating at CST-relevant conditions. Simultaneous laser and probe-based diagnostics were employed to obtain measurements of pollutant emissions, flow velocities, heat release rate, fuel-air mixing and thermoacoustic dynamics. The effects of combustor inlet pressure, temperature and fuelair ratio are studied via corresponding parameter sweeps. Numerical chemistry simulations provide estimates of relevant flame properties, complementary to the experimental results. A second set of experiments investigated the forced response of the combustor.Overall, the results presented in this thesis demonstrate the importance of flame and flow interactions. In particular, the interactions of the pilot flame with neighbouring main flames are found to be critical in determining the stable operating range of the combustor. Furthermore, the pilot is found to dominate the dynamics of the combustor at forced and unforced conditions. Empirically-computed flame transfer functions at different forcing frequencies show that the pilot is most sensitive to acoustic perturbations and that this sensitivity is enhanced by interactions of the pilot with the main flames.This work also demonstrates the viability of LPP combustors for CST applications in three aspects. First, the pollutant emissions characteristics of the combustor studied are in line with future emissions targets. Second, the mean flow field, flame and dynamical characteristics do not vary strongly with operating conditions or undergo sudden or unexpected bifurcations, except when exceeding blowoff limits. A Damkohler number (Da)-based blowoff analysis shows that this combustor design exhibits enhanced stability compared with previously reported bluff-body stabilized flames. The analysis itself also demonstrates the robustness of a simple Da correlation for blowoff prediction, which works for a complex geometry such as the one studied in this work.
일반주제명  
Behavior
일반주제명  
Pollutants
일반주제명  
Campaigns
일반주제명  
Hydrocarbons
일반주제명  
Investigations
일반주제명  
Flow velocity
일반주제명  
Emissions
일반주제명  
Airplane engines
일반주제명  
Carbon monoxide
일반주제명  
Aviation
일반주제명  
Environmental impact
일반주제명  
Research & development--R&D
일반주제명  
Pilots
일반주제명  
Aircraft
일반주제명  
Viscosity
일반주제명  
Gases
일반주제명  
Temperature effects
일반주제명  
Design
일반주제명  
Acoustics
일반주제명  
Emission standards
일반주제명  
Reynolds number
일반주제명  
Geometry
일반주제명  
Fluid mechanics
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05A.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI32309231
■035    ▼a(MiAaPQ)GeorgiaTech73208
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a658
■1001  ▼aPassarelli,  Mitchell  Louis.
■24513▼aAn  Experimental  Characterization  of  a  Multielement  Lean  Premixed  Pre-Vaporized  Combustor  for  Supersonic  Transport  Applications
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a122  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  A.
■500    ▼aAdvisor:  Steinberg,  Adam  M.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2023.
■520    ▼aRecent  trends  have  driven  a  re-emergence  of  research  and  development  in  aircraft  engines  for  commercial  supersonic  transport  (CST).  Despite  the  vast  body  of  literature  that  exists  for  gas  turbine  combustors  operating  at  conditions  relevant  to  conventional  subsonic  flight,  there  is  little  to  validate  extensions  of  this  knowledge  to  the  conditions  encountered  by  CST  engines.  Further  complications  arise  from  advanced  combustor  designs  that  involve  multiple  different  flames  or  flow  devices.  The  interactions  of  such  combustor  elements  can  lead  to  individual  behaviours  that  differ  from  that  of  single  elements.The  existing  literature  on  flame  and  flow  interactions  is  focused  on  conditions  relevant  to  the  operation  of  conventional,  subsonic  aircraft  engines.  While  such  works  provide  a  baseline  understanding  of  the  physical  phenomena  involved  in  such  interactions,  they  do  not  necessarily  predict  the  behaviours  exhibited  by  different  combustor  configurations  and/or  at  different  conditions.  Some  recent  studies  have  employed  numerical  simulations  to  determine  the  characteristics  of  various  combustor  schemes,  including  lean  direct  injection  and  lean  premixed  pre-vaporized  (LPP)  designs.  These  studies  are  limited  by  the  lack  of  empirical  data  for  validation  and  model  development.The  work  presented  herein  aims  to  characterize  experimentally  the  flow  field,  flame  dynamics  and  operating  limits  of  a  multi-element  LPP  combustor  operating  at  CST-relevant  conditions.  Simultaneous  laser  and  probe-based  diagnostics  were  employed  to  obtain  measurements  of  pollutant  emissions,  flow  velocities,  heat  release  rate,  fuel-air  mixing  and  thermoacoustic  dynamics.  The  effects  of  combustor  inlet  pressure,  temperature  and  fuelair  ratio  are  studied  via  corresponding  parameter  sweeps.  Numerical  chemistry  simulations  provide  estimates  of  relevant  flame  properties,  complementary  to  the  experimental  results.  A  second  set  of  experiments  investigated  the  forced  response  of  the  combustor.Overall,  the  results  presented  in  this  thesis  demonstrate  the  importance  of  flame  and  flow  interactions.  In  particular,  the  interactions  of  the  pilot  flame  with  neighbouring  main  flames  are  found  to  be  critical  in  determining  the  stable  operating  range  of  the  combustor.  Furthermore,  the  pilot  is  found  to  dominate  the  dynamics  of  the  combustor  at  forced  and  unforced  conditions.  Empirically-computed  flame  transfer  functions  at  different  forcing  frequencies  show  that  the  pilot  is  most  sensitive  to  acoustic  perturbations  and  that  this  sensitivity  is  enhanced  by  interactions  of  the  pilot  with  the  main  flames.This  work  also  demonstrates  the  viability  of  LPP  combustors  for  CST  applications  in  three  aspects.  First,  the  pollutant  emissions  characteristics  of  the  combustor  studied  are  in  line  with  future  emissions  targets.  Second,  the  mean  flow  field,  flame  and  dynamical  characteristics  do  not  vary  strongly  with  operating  conditions  or  undergo  sudden  or  unexpected  bifurcations,  except  when  exceeding  blowoff  limits.  A  Damkohler  number  (Da)-based  blowoff  analysis  shows  that  this  combustor  design  exhibits  enhanced  stability  compared  with  previously  reported  bluff-body  stabilized  flames.  The  analysis  itself  also  demonstrates  the  robustness  of  a  simple  Da  correlation  for  blowoff  prediction,  which  works  for  a  complex  geometry  such  as  the  one  studied  in  this  work.
■590    ▼aSchool  code:  0078.
■650  4▼aBehavior
■650  4▼aPollutants
■650  4▼aCampaigns
■650  4▼aHydrocarbons
■650  4▼aInvestigations
■650  4▼aFlow  velocity
■650  4▼aEmissions
■650  4▼aAirplane  engines
■650  4▼aCarbon  monoxide
■650  4▼aAviation
■650  4▼aEnvironmental  impact
■650  4▼aResearch  &  development--R&D
■650  4▼aPilots
■650  4▼aAircraft
■650  4▼aViscosity
■650  4▼aGases
■650  4▼aTemperature  effects
■650  4▼aDesign
■650  4▼aAcoustics
■650  4▼aEmission  standards
■650  4▼aReynolds  number
■650  4▼aGeometry
■650  4▼aFluid  mechanics
■690    ▼a0389
■690    ▼a0986
■690    ▼a0474
■690    ▼a0204
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05A.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361286▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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