전기점화 기관 간극 체적 내 미연탄화수소의 산화 모델링

Modeling of Piston Crevice Hydrocarbon Oxidation in SI Engines

  • 최회명 (서울대학교 대학원 기계항공공학부) ;
  • 김세준 (서울대학교 대학원 기계항공공학부) ;
  • 민경덕 (서울대학교 기계항공공학부)
  • 발행 : 2001.06.27

초록

Combustion chamber crevices in SI engines are identified as the largest contributor to the engine-out hydrocarbon emissions. The largest of crevice region is the piston ring pack crevice. To predict and understand the oxidation process of piston crevice hydrocarbons, a 3-dimensional numerical simulation method was developed. A engine shaped computational mesh with moving grid for piston and valve motions was constructed. And a 4-step oxidation model involving 7 species was used and the 16 coefficients in the rate expressions were optimized based on the results from a detailed chemical kinetic mechanism for the oxidation condition of engine combustion chamber. Propane was used as a fuel in order to eliminate oil layer absorption and liquid fuel effect.

키워드