Fuel Design Concept for Robust Ignition Process in Compression Ignition Engines

着火ロバスト性を考慮した圧縮着火機関の燃料設計

A fuel design concept for an HCCI engine to optimize a profile of heat release and achieve a robust ignition process has been proposed and applied to design the optimal methane-based blend. According to results from detailed chemical kinetic computations where ignition process chemistry of each component of the natural gas was analyzed, ethane indicates a low ignitability close to that of methane with an initial temperature below 800 K, but a higher ignitability close to those of propane, n-butane and isobutane with an initial temperature above 1100 K. And ethane indicates a higher heat release rate than those of the other components in a late stage of an ignition process. According to results from engine operating tests with a compression ratio of 28.0 : 1, a dual-component fuel of the main component of methane and the sub component of ethane demonstrates a lower COV of IMEP than those of the other dual-component fuels with the sub components of propane, n-butane and isobutane, when the timing of 10 % heat release is set at the same crank angle in the expansion stroke.燃料組成が熱着火準備期間の熱発生パターンにおよぼす影響を明らかにする.予混合圧縮着火機関の燃焼変動は,膨張行程における熱発生が膨張による内部エネルギー低下に競い負けることに起因する.熱発生パターンと着火ロバスト性の関係を明らかにし,燃焼変動を抑止することを意図した燃料設計コンセプトを提案する.

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  • Accession Number: 01676734
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jan 31 2018 3:14PM