Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Spray Characteristics of Diesel Fuel in a Cylinder under Cryogenic Intake Air Temperature Conditions

극저온의 흡기 온도 조건에서 실린더 내 디젤 연료의 분무 특성

  • 민세훈 (공주대학교 기계공학과 대학원) ;
  • 서현규 (공주대학교 기계자동차공학부)
  • Received : 2021.01.08
  • Accepted : 2021.02.03
  • Published : 2021.03.31
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Abstract

The objective of this study is to investigate the effect of cryogenic intake air temperature on the injected fuel droplet behavior in a compression ignition engine under the different start of energizing timing. To achieve this, the intake air temperatures were changed from -18℃ to 18℃ in steps of 9℃, and the result of fuel evaporation rate, Sauter mean diameter, and equivalence ratio distributions were compared. When the intake air temperature decreased in steps of 9℃, less fuel was evaporated by about 3.33% because the cylinder temperature was decreased. In addition, the evaporated fuel amount was increased with retarding the start of energizing timing because the cylinder temperature raised. However, the difference was decreased according to the retarded start of energizing timing because the cylinder pressure was also increased at the start of fuel injection. The equivalence ratio was reduced by 5.94% with decreasing the intake air temperature. In addition, the ignition delay was expected to longer because of the deteriorated evaporation performance and the reduced cylinder pressure by the low intake air temperature.

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