대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제34권12호
  • /
  • Pages.1035-1042
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  • 2010
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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열적성층화가 DME/n-Butane 예혼합압축자기착화연소에 미치는 영향에 관한 연구

Study on the Effect of Thermal Stratification on DME/n-Butane HCCI Combustion

  • 임옥택 (울산대학교 기계자동차공학부)
  • Lim, Ock-Taeck (School of Mechanical and Automotive Engineering, Univ. of Ulsan)
  • 투고 : 2009.02.22
  • 심사 : 2010.10.16
  • 발행 : 2010.12.01
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초록

HCCI 엔진연소에서 열적성층화 효과는 노킹을 회피하는 수단으로서 생각되고 있다. 본 연구에서는 DME 와 n-Butane 을 연료로 하는 HCCI 엔진연소의 열적성층화 효과를 조사하였다. 예혼합기가 연소실내부에 투입되고 부력의 효과를 이용하여 연소실 내부에 열적성층화를 형성한다. 그 뒤에 피스톤의 압축에 의해서 단열압축 시킨 후 연소실압력과 2 차원화학발광법을 계측하여 해석하였다. 열적성층화가 존재하는 경우에는, 저온산화반응과 고온산화반응의 시작시기가 균질한 경우에 비해서 진각되었고 연소기간은 길어졌다. 발광의 시작은 온도가 높은 곳에서부터 시작하여 온도가 낮은 곳으로 전파 되는 것을 확인하였고 발광기간도 길어짐을 확인하였다.

The thermal stratification effect has been thought as one of the way to avoid dramatically generating the heat from HCCI combustion. We investigate the effect of thermal stratification on HCCI combustion fueled by DME and n-Butane. The thermal stratification occurs in a combustion chamber of a rapid compression machine with premixture by buoyancy effect that is made of fuel and air. The premixture is then adiabatically compressed, and during the process, the in-cylinder gas pressure is measured and two-dimensional chemiluminescence images are prepared and analyzed. Under the thermal stratification, the LTR starting time and the HTR starting time are advanced than that of homogeneous case. Further, the LTR period and the luminosity duration under homogeneous conditions are shorter than the corresponding quantities under stratified conditions. Additionally, under stratified conditions, the brightest luminosity intensity is delayed longer than that of homogeneous condition.

키워드

참고문헌

  1. Thring, R. H., 1989, “Homogeneous-Charge Compression-Ignition (HCCI) Engine,” SAE Paper 892068.
  2. Kumano, K. and Iida, N., 2004, “Analysis of the Effect of Charge Inhomogeneity on HCCI Combustion by Chemiluminescence Measurement,” SAE paper 2004-01-1902.
  3. Sjoberg, M., John E. D. and Cernansky, N. P., 2005, “Potential of Thermal Stratification and Combustion Retard for Reducing Pressure-Rise Rates in HCCI Engines, Based on Multi-Zone Modeling and Experiments,” SAE paper 2005-01-0113.
  4. Eng, J. A., 2002, “Characterization of Pressure Waves in HCCI Combustion,” SAE Paper 2002-01-2859.
  5. Kwon, O. and Lim O., 2009, “Effect of the Boost Pressure on Thermal Stratification on HCCI Engine Using Multi-Zone Modeling,” Trans. of the KSME (B)Vol.33, No.3. https://doi.org/10.3795/KSME-B.2009.33.4.248
  6. Lim, O., Nakano, H. and Iida, N., 2006, “The Research About the Effects of Thermal Stratification on N-Heptane/Iso-Octane-Air Mixture HCCI Combustion Using a Rapid Compression Machine,” SAE paper 2006-01-3319.
  7. Luz, A.E., Rupley, F. and Miller, J.A., 1989, “CHEMKIN-II:A FORTRAN Chemical Kinetics Pacage for the Analysis of Gas-Phase Chemical Kinetics,” Sandia National Laboratories Report, SAND89-8009B.