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Instability and Transition on Slender Cones Under Fully Quiet Mach-6 Flow- [electronic resource]
Instability and Transition on Slender Cones Under Fully Quiet Mach-6 Flow- [electronic resource]

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자료유형  
 학위논문
Control Number  
0016932806
International Standard Book Number  
9798379847913
Dewey Decimal Classification Number  
621
Main Entry-Personal Name  
Gray, Kathryn.
Publication, Distribution, etc. (Imprint  
[S.l.] : Purdue University., 2022
Publication, Distribution, etc. (Imprint  
Ann Arbor : ProQuest Dissertations & Theses, 2022
Physical Description  
1 online resource(209 p.)
General Note  
Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
General Note  
Advisor: Schneider, Steven;Jewell, Joseph.
Dissertation Note  
Thesis (Ph.D.)--Purdue University, 2022.
Restrictions on Access Note  
This item must not be sold to any third party vendors.
Summary, Etc.  
요약Experiments were performed in the Boeing/AFOSR Mach-6 Quiet Tunnel on sharp, slender straight cones at zero degrees angle of attack. These long models allow the second mode to grow to large amplitudes without the need for introduced perturbations and without the presence of the Gortler instability. PCB pressure sensors and global thermal imaging are used to study the development of the second-mode instability. Transition was measured on both the 2.5◦ and 3◦ half-angle cones in high-Reynolds number quiet flow, indicated by increased heating and by breakdown of the second-mode instability.Evidence of a flow-induced vibration on the 2.5◦ model was also measured for freestream unit Reynolds numbers between approximately 6.5x106 and 9.5x106/m. These conditions produce large second-mode waves, and it is thought that the second-mode instability incites a resonance in the model near 100 kHz. The vibration interferes with measurements of the second mode. Since no such phenomenon is seen on the 3◦ cone, it was the predominant model studied.Second-mode amplitudes on the 3◦ cone grew to a maximum amplitude before breakdown of 25.3% of the mean surface pressure. This value agreed with previous correlations between edge Mach number and the maximum second-mode amplitude that were found from measurements in conventional wind tunnels. The maximum second-mode amplitude was measured at approximately Rex = 10.0 x 106 . Small residual angles of attack (less than 0.1 ◦ ) did not significantly affect the maximum second-mode amplitude or the Reynolds number at which it was measured.Heat transfer was measured on the 3◦ cone using IR thermography, and the laminar-scaled Stanton number was used to estimate the beginning of transition. The heating rose above the laminar value at Rex = 9.6 x 106 , almost simultaneously with the second mode reaching the maximum amplitude. This indicates that transition begins as the second mode begins to break down. The rise in heating coincides with the appearance of streamwise heating streaks. The streaks move forward on the cone for increasing Reynolds numbers. A second set of streaks appears downstream of the primary set for higher Reynolds numbers. The maximum heating is measured near the end of transition at approximately Rex = 12.4 x 106before the heating decreases towards the turbulent value.Measurements of intermittency were used to estimate the onset of transition, and good agreement was reached with the transition-onset location estimated using heat transfer. The measured intermittency compared well to the classic Narasimha-Dhawan distribution. Additionally, the intermittency indicated that the flow became always turbulent at approximately Rex = 12.0 x 106, which is just before the maximum in heating. The ratio of the onset of transition to the end of transition for the 3◦ cone was approximately 0.85. The ratio for the Reentry F flight was approximately 0.8 and the ratio for conventional wind tunnels is typically near 0.5. These results support previous findings that the transition extent in quiet tunnels is shorter than in noisy tunnels and better approximates that seen in flight.
Subject Added Entry-Topical Term  
Heat transfer.
Subject Added Entry-Topical Term  
Reynolds number.
Subject Added Entry-Topical Term  
Sensors.
Subject Added Entry-Topical Term  
Fluid mechanics.
Subject Added Entry-Topical Term  
Mechanics.
Subject Added Entry-Topical Term  
Thermodynamics.
Added Entry-Corporate Name  
Purdue University.
Host Item Entry  
Dissertations Abstracts International. 85-01B.
Host Item Entry  
Dissertation Abstract International
Electronic Location and Access  
로그인을 한후 보실 수 있는 자료입니다.
Control Number  
joongbu:643776

MARC

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■020    ▼a9798379847913
■035    ▼a(MiAaPQ)AAI30506155
■035    ▼a(MiAaPQ)Purdue21273051
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a621
■1001  ▼aGray,  Kathryn.
■24510▼aInstability  and  Transition  on  Slender  Cones  Under  Fully  Quiet  Mach-6  Flow▼h[electronic  resource]
■260    ▼a[S.l.]▼bPurdue  University.  ▼c2022
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2022
■300    ▼a1  online  resource(209  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-01,  Section:  B.
■500    ▼aAdvisor:  Schneider,  Steven;Jewell,  Joseph.
■5021  ▼aThesis  (Ph.D.)--Purdue  University,  2022.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aExperiments  were  performed  in  the  Boeing/AFOSR  Mach-6  Quiet  Tunnel  on  sharp,  slender  straight  cones  at  zero  degrees  angle  of  attack.  These  long  models  allow  the  second  mode  to  grow  to  large  amplitudes  without  the  need  for  introduced  perturbations  and  without  the  presence  of  the  Gortler  instability.  PCB  pressure  sensors  and  global  thermal  imaging  are  used  to  study  the  development  of  the  second-mode  instability.  Transition  was  measured  on  both  the  2.5◦  and  3◦  half-angle  cones  in  high-Reynolds  number  quiet  flow,  indicated  by  increased  heating  and  by  breakdown  of  the  second-mode  instability.Evidence  of  a  flow-induced  vibration  on  the  2.5◦  model  was  also  measured  for  freestream  unit  Reynolds  numbers  between  approximately  6.5x106  and  9.5x106/m.  These  conditions  produce  large  second-mode  waves,  and  it  is  thought  that  the  second-mode  instability  incites  a  resonance  in  the  model  near  100  kHz.  The  vibration  interferes  with  measurements  of  the  second  mode.  Since  no  such  phenomenon  is  seen  on  the  3◦  cone,  it  was  the  predominant  model  studied.Second-mode  amplitudes  on  the  3◦  cone  grew  to  a  maximum  amplitude  before  breakdown  of  25.3%  of  the  mean  surface  pressure.  This  value  agreed  with  previous  correlations  between  edge  Mach  number  and  the  maximum  second-mode  amplitude  that  were  found  from  measurements  in  conventional  wind  tunnels.  The  maximum  second-mode  amplitude  was  measured  at  approximately  Rex  =  10.0  x  106  .  Small  residual  angles  of  attack  (less  than  0.1  ◦  )  did  not  significantly  affect  the  maximum  second-mode  amplitude  or  the  Reynolds  number  at  which  it  was  measured.Heat  transfer  was  measured  on  the  3◦  cone  using  IR  thermography,  and  the  laminar-scaled  Stanton  number  was  used  to  estimate  the  beginning  of  transition.  The  heating  rose  above  the  laminar  value  at  Rex  =  9.6  x  106  ,  almost  simultaneously  with  the  second  mode  reaching  the  maximum  amplitude.  This  indicates  that  transition  begins  as  the  second  mode  begins  to  break  down.  The  rise  in  heating  coincides  with  the  appearance  of  streamwise  heating  streaks.  The  streaks  move  forward  on  the  cone  for  increasing  Reynolds  numbers.  A  second  set  of  streaks  appears  downstream  of  the  primary  set  for  higher  Reynolds  numbers.  The  maximum  heating  is  measured  near  the  end  of  transition  at  approximately  Rex  =  12.4  x  106before  the  heating  decreases  towards  the  turbulent  value.Measurements  of  intermittency  were  used  to  estimate  the  onset  of  transition,  and  good  agreement  was  reached  with  the  transition-onset  location  estimated  using  heat  transfer.  The  measured  intermittency  compared  well  to  the  classic  Narasimha-Dhawan  distribution.  Additionally,  the  intermittency  indicated  that  the  flow  became  always  turbulent  at  approximately  Rex  =  12.0  x  106,  which  is  just  before  the  maximum  in  heating.  The  ratio  of  the  onset  of  transition  to  the  end  of  transition  for  the  3◦  cone  was  approximately  0.85.  The  ratio  for  the  Reentry  F  flight  was  approximately  0.8  and  the  ratio  for  conventional  wind  tunnels  is  typically  near  0.5.  These  results  support  previous  findings  that  the  transition  extent  in  quiet  tunnels  is  shorter  than  in  noisy  tunnels  and  better  approximates  that  seen  in  flight.
■590    ▼aSchool  code:  0183.
■650  4▼aHeat  transfer.
■650  4▼aReynolds  number.
■650  4▼aSensors.
■650  4▼aFluid  mechanics.
■650  4▼aMechanics.
■650  4▼aThermodynamics.
■690    ▼a0204
■690    ▼a0346
■690    ▼a0348
■71020▼aPurdue  University.
■7730  ▼tDissertations  Abstracts  International▼g85-01B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0183
■791    ▼aPh.D.
■792    ▼a2022
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16932806▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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