Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Performance Prediction according to Equivalence Ratio Change in Simulated-EGR Compression Ignition Engine Containing CO2

CO2를 포함한 Simulated-EGR 압축착화엔진에서 당량비 변화에 따른 성능 예측

  • 서현규 (공주대학교 기계자동차공학부)
  • Received : 2020.02.23
  • Accepted : 2020.03.04
  • Published : 2020.03.30
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Abstract

The objective of this work is to numerically reveal the effect of equivalence ratio change on the simultaneous reduction of NOX and soot emissions from the simulated-EGR compression ignition engine containing CO2. An experiment was conducted by using a single-cylinder common-rail injection system engine, an intake control system, and exhaust emissions analyzers. The numerical analysis results were validated under the same experimental conditions. To investigate the effect of equivalence ratio by simulated-EGR containing CO2, the O2, N2, and CO2 mole fraction were changed in the initial air conditions to the cylinder. The results were analyzed in terms of peak cylinder pressure, indicated mean effective pressure, indicated specific nitrogen oxide, and indicated specific soot. It was revealed that ignition delay characteristics and heat release rate (ROHR) characteristics were not significantly different according to the equivalence ratio. However, as the equivalence ratio increased from 0.68 to 0.83, the maximum combustion pressure and IMEP decreased by about 6.5% and 9.4%, respectively. In the case of ISFC, as is well known, the trend is opposite of IMEP. In the case of ISNO, as the equivalence ratio increased, less NO was generated, and as the equivalence ratio increased by 0.05, the ISSoot value of about 10% increased.

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