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Title:

Internal Combustion Engine

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Internal Combustion Engine Chapter 6 Fluid Motion Within Combustion Chamber , ... – PowerPoint PPT presentation

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Title: Internal Combustion Engine


1
Internal Combustion Engine
  • Chapter 6
  • ??? ?? ????
  • Fluid Motion Within Combustion Chamber

??? ??? ??, ??? ??? ?? ??, ????? ???? ??
2
6-1 ??(turbulence)
  • ? Intake runner? port? ?? ??? ??? ??? ?? ?? ???
    ??? ???? ??? ??? ????. ??? ??? ?? ??(Reynolds ??
    ?? ??)?? laminar flow??? ??? ?? ???? turbulent
    flow? ??? ??? ??, ???, ??? ?? ??? ??? turbulent
    flow??.
  • ? Turbulent flow? ??? ? ???? ??? ???? ???? ???
    ???? ???. ?? cycle? ?? ?? crank angle?? ? ???? ?
    ??? ???? ????? ?? ? ??? ? cycle??? ?? ??? ???
    turbulent level? ???? ? ??? ??? ??. ???? ??? ????
    turbulent intensity? ??? ? ?? ??? turbulent? ???
    ??.
  • ? Turbulent flow? ??? laminar flow? ?? mixing?
    ??? ????? ??? ??? ??? ???? ????. ????? ??? ???
    turbulent level? ???? ???? ??????? ???? ?????
    ???? ??? ????? ??? ???? ???? ??. ? ?? ?? ??? ????
    ??.

3
  • ? SI engine?? ?? ??? ??? piston? TDC ??? ?? ? ???
    ????? ?? end-gas? ????? ??? ??? ???? ???
    autoignition? ? ???? ?? ??? ???? ?? ??? ???? ? ??
    ??.
  • ? CI engine??? ??? ??? ??? ? ????? ??? ??? ?
    ????? soot?? ??? ???? ??.
  • ? ?? ?? ?? turbulent level? ??? ??? ?? ??? ???
    ???? turbulent level? ???? ??? ???? ???? ??. ????
    ???? ??? ?? ??? ?? seat ??? ???? ???? ??? ??? ???
    ?? ?? turbulent level? ?? ??. ??? ??? ?????? ????
    dissipation? ??? ??? head, piston??? ?? ??? ???
    turbulent level? ???? ??. ???? ???? ???? ???
    turbulent level? ??? ?? ???? ??? ??? ????
    turbulent level? ??? ?? ????.

4
  • ? ?? Turbulent Flow? ??
  • ??? ??? ?????? ?? ????? ??? ???? ? ?? ??.
    Two-Stroke Cycle Engine??? ????? ????? ??? ???
    ??? ????? ?? ?? ? ??. ?? ?? Turbulent Level?
    ???? ??? ???? ??? ?? ?? ?? ??? ??? ??? ??.
  • ? ??? ??? ????? ??? ???? turbulent level? ????
    ????? ???? ??. ???? ? cycle? ??? ??? ???? ???
    ???? ??????? ?? ???? ??. ?? ?? ?? ??? Laminar
    Flame Speed? ????? ????? ????? ?????? ?? ???? ???
    ?? ?? ??? ?? Spark Timing? ?? ??? ??? ??.

5
(No Transcript)
6
6-2 ??(swirl)
???(swirl ratio)
  • ? ? ???? ? ?? ??? ?? ???? ????? ??? ??? ??? ???
    ?? ??swirl? ????. swirl? ??? ?? ???? ?? ?? ???
    ???? ??? ???? ??? ?????? ?????? ????turbulent
    level? ????? ??? ?? ???? ??? ????? ?????? ??.

7
(No Transcript)
8
???(Paddle whell) ??
9
(No Transcript)
10
????(????)/(???)
11
6-3 ???? ?? (squish tumble)
  • ? ? ???? 4 valve? ???? ???? ?? port?? ??? ???
    swirl ????? ????? tumble ??? ??????. Tumble?
    swirl? ??? ???? ???? ???? port? straight?? ?? ??
    ????? ??? ??? ??? ??? ???? ?? ??? ?? ??? ?? ??.
    tumble ??? ?? ?? ?? ??? turbulent level? ??? ???
    ??.

12
  • ? ??? ?? ?????? ??? ???? squish? ????. Squish?
    head? piston? ??? ????? ????? ?? ??? ??? ????
    ??????? ?? ????? ?? ??? ????? ?? ???. ?? CI
    engine?? ?? ???? ???? ??? center? bowl? ?? ?? ?
    ??? ?? ??? ???? ???? ? ?? ??? ???? ??? ????? ???
    ??. ?? ??? ?? ???? ????? bowl??? ???? ??? ??????
    ??? ???? ?? ??? ?? ??? ??? ??? ?? ?? ???
    reentrant type?? ??? ?? ?? ???? ??.

13
6-5 ?? ??? ????
14
(No Transcript)
15
(No Transcript)
16
Direct Injection SI Engine
  • ?SI engine??? ????
  • ? ?? ???? ??? ?
  • ? ???? ??? ???
  • ? bowl? ??? part load
  • ? ??? ? ??? ???
  • ???? ??.
  • ?? ????? ??? ?
  • bowl??? ??? ???
  • ?? ????? ????
  • ?? ???? ?? ???
  • ???? ??? ?? HC
  • ??? ??? ??.
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