Scramjet engine ??

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Scramjet engine ??
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??

1. Scramjet ???
2. ??????? ??? ???
3. Ramjet ?? ???
4. scramjet? ??? ????
5. ?? ???????
6. ?? ???? scramjet ???
7. ???? scramjet ???
8. reference

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What is a scramjet?
A scramjet is a kinetic compression(ramjet) with
a supersonic air through-flow ? supersonic
combustion ramjet
Combustion speed remains 35 µsec 5 µsec
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??????? ??????(1)
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??????? ??????(2)
? ramjet
Scramjet ?
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Ramjet ?? ???
Ramjet
Scramjet
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scramjet? ??? ????(1)
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scramjet? ??? ????(2)
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scramjet? ??? ????(3)
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scramjet? ??? ????(4)
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Premixing process
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?????????(1)
Strong Interaction in CP1 the growth rate(dc/x)
of mixing layer starts to increase significantly
after CP1 Weak Interaction in CP2 , CP3 smaller
density gradient between fuel and air within the
mixing layer
CP1 first crossing point CP2 second crossing
pointCP3 third crossing pointdc mixing layer
thickness
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?????????(2)
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?????????(3-1)
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?????????(3-2)
The mixing/combustion efficiency is increased
when wedge is positioned adequately.
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?????????(4)
Supersonic Flame ( Increasing Fuel)
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?????????(5)
Supersonic Flame ( Increasing Air)
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WHY IS IT SO EXPENSIVE?
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?? ???? turbo-ramjet???(1)
J-58 Pratt and Whitney Engine
SR71
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?? ???? turbo- ramjet???(2)

• ltltSpecifications gtgt
• Model Pratt Whitney J-58JT11D-20
• Compressor 9-stage, axial flow, single spool
  Turbine two-stage axial flow
• Thrust 32,500 lbs. with afterburner
• Weight approx. 6,000 lbs.
• Max. operating altitude above 80,000 ft.

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SR71 ????
Closeup of J-58 Inlet with Spike Removed
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?? ???? scramjet???
Scramjet EngineHyper-X (Future)Mach 10
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Reference

• http//jpl.snu.ac.kr/research/highspeed/supersonic
  /SupConcept.htm
• http//www.wvi.com/lelandh/j-581.htm
• http//www.aviation-history.com/engines/ramjet.htm
  
• http//www.physics.uq.edu.au8001/lp/lasdiag/scram
  .htm
• http//www.atse.org.au/publications/focus/focus-st
  alker.htm
• http//www.grc.nasa.gov/WWW/K-12/airplane/rampart.
  htm
• http//www.hq.nasa.gov/office/pao/History/SP-440/c
  h8-2.htm