A Numerical Simulation Study on Improving the Thermal Efficiency of a Spark Ignited Engine


A reduction in heat losses is an important factor of improving thermal efficiency of internal combustion engines. This study developed a two-zone combustion model considering autoignition in the unburned gas zone, coupled with an instantaneous heat transfer model on the combustion chamber wall. These models made it possible to discuss the interaction of the heat losses and knock occurrence and to optimize the spark ignition timing. The specific purpose of the present study is to explore the fundamental characteristics of wall surface temperature swings and the effect of applying a low thermal conductivity and low specific heat material to the combustion chamber wall on thermal efficiency and then to indicate the possibility of improving thermal efficiency and its mechanisms.火炎伝播速度と未燃部における自着火反応を考慮した二領域燃焼モデルを構築し,これと燃焼室壁面の非定常一次元伝熱計算を組み合わせた数値モデルを開発した.このモデルを用いて瞬時熱流束や未燃部温度,ノックの有無を推算することで,各種運転条件における点火時期や断熱の効果を検証した.


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  • Accession Number: 01667924
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jan 31 2018 3:17PM