Numerical Optimization of Parameters to Improve Thermal Efficiency of a Spark-Ignited Natural Gas Engine

Hisashi Miyai, Kyosuke Iwaya, Akira Kikusato, Jin Kusaka, Yasuhiro Daisho, Hisaharu Nakashima, Yoichi Kawaguchi, Daisuke Mizuguchi, Hiroyuki Hasegawa

研究成果: Conference article査読

6 被引用数 (Scopus)


Natural gas is a promising alternative fuel for internal combustion engines because of its clean combustion characteristics and abundant reserves. However, it has several disadvantages due to its low energy density and low thermal efficiency at low loads. Thus, to assist efforts to improve the thermal efficiency of spark-ignited (SI) engines operating on natural gas and to minimize test procedures, a numerical simulation model was developed to predict and optimize the performance of a turbocharged test engine, considering flame propagation, occurrence of knock and ignition timing. The numerical results correlate well with empirical data, and show that increasing compression ratios and retarding the intake valve closing (IVC) timing relative to selected baseline conditions could effectively improve thermal efficiency. In addition, employing moderate EGR ratios is also effective for avoiding knock. Overall, the optimization of operating conditions reported in the present paper increased thermal efficiency relative to the selected baseline conditions by 5% points.

ジャーナルSAE Technical Papers
出版ステータスPublished - 2015 9月 1
イベントJSAE/SAE 2015 International Powertrains, Fuels and Lubricants Meeting, FFL 2015 - Kyoto, Japan
継続期間: 2015 9月 12015 9月 4

ASJC Scopus subject areas

  • 自動車工学
  • 安全性、リスク、信頼性、品質管理
  • 汚染
  • 産業および生産工学


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