• Title/Summary/Keyword: PLII

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The Effects of N2 Diluent and Preheated Air on Soot Emission in Laminar Diffusion Flames (층류확산화염에서 질소 첨가와 예열온도가 매연 생성에 미치는 영향)

  • Jeong, Yong-Ki;Lee, Jong-Ho;Jeon, Chung-Hwan;Jang, Young-June
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.1
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    • pp.1-8
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    • 2004
  • An study has been performed with axisymmetric coflow diffusion flames to investigate the influence of air-side fuel side dilution and initial preheated temperature on the soot formation in methan/air flames. Soot quantities are determined by using PLII(Planar Laser Induced Incandescence), such a $C_2$H$_2$ major species(CH$_4$, $O_2$, $N_2$) and temperature are simulated by chemkin code. The numerical analysis was performed with transport properties and detailed reaction mechanisms m axisymmetric coflow diffusion flames. The study of how flame temperature and $N_2$ dilution of air and fuel side influence the soot concentrations is focused. Soot concentrations results on PLII show that preheated temperature contributes to an increase in the soot volume fraction, and soot formation Is more productive to air side dilution than to fuel side dilution. $C_2$H$_2$ concentrations have a similar tendency to soot concentrations.

Soot and NOx Emissions in Laminar Diffusion Flames: Effects of Air-Side versus Fuel-Side Diluent Addition (층류 확산화염에서의 매연과 질소산화물의 배출특성 : 공기측/연료측 희석제 첨가에 따른 영향)

  • Lee, Jong-Ho;Eom, Jae-Ho;Park, Chul-Woong;Jun, Chung-Hwan;Jang, Young-June
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.5
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    • pp.596-603
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    • 2003
  • Present study has been conducted to see the relative effects of adding N: to fuel-side and air-side on flame structure, soot formation and NOx emissions. Experiments were carried out to ascertain to what degree chemical kinetics and/or molecular transport effects can explain the differences in soot formation and NOx emission by studying laminar diffusion flames. Direct photograph was taken to see the flame structure. CARS techniques was used to get the flame temperature profiles. And spatial distribution of soot could be obtained by PLII method. CHEMKIN code was also used to estimate the global residence time to predict NOx emissions at each condition. Results from these studies indicate that fuel-side dilution is more effective than air-side dilution in view of NOx emissions. However, air-side dilution shows greater effectiveness over fuel-side dilution in soot formation. And turbulent mixing and heat transfer problems were thought to be considered in practical applications.