Proposal of Knock Mitigation Method through Enhancement of Local Heat Transfer

局所熱伝達促進によるノック限界改善手法の提案

For enlarging the knock limit of SI engine to realize further increases in thermal efficiency, the authors proposed a simple method to promote local heat transfer through moderate enhancement of the gas flow at the point of origin of knock, in order to lower the end-gas temperature and by this means retard auto-ignition timing. The use of the proposed method advances the combustion phase 2.2 degree without increasing the discharge of unburned exhaust components, and this advance in the combustion phase increases IMEP by 17.2 kPa.ピストン頂面形状操作により筒内流れを操作し,エンドガスの自着火頻度の高い位置のガス流動を適度に強化し,局所の熱伝達促進とこれを利用したSI機関のノックの回避を試みた.機関性能試験と瞬時熱流束計測および三次元数値流体計算にて得られた結果から狙いどおりノックを回避できることが確認されたので報告する.

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  • English
  • Japanese

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Filing Info

  • Accession Number: 01673969
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: May 15 2018 3:06PM