21113 小型急速圧縮装置を用いたDME-プロパン-空気混合気の燃焼特性に関する研究(燃料と燃焼の新しい展開(3),OS.9 燃料と燃焼の新しい展開,学術講演)

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Recently, as the environmental problems become more serious, small gasoline engines need to achieve low emissions and fuel consumption. Nevertheless, only very limited information is available for reducing the emissions and fuel consumption of small gasoline engines (50-125cc).In this study, using small type rapid compression machine the experiments have been carried out to obtain essential data on combustion characteristics of DME-propane-air mixtures influenced by high heat losses. Maximum burning pressure and the flame speed of DME-propane-air mixtures have been investigated. The main conclusions are as follows: 1) Maximum burning pressure of DME-propane-air mixtures is observed in the vicinity of equivalence ratio Φ=1.5 in a small type internal combustion engine. 2) The maximum flame speed is obtained at overall equivalence ratio Φ=1.3 in the lean side of DME-propane-air mixtures. 3) In a low oxygen concentration, the maximum burning pressure of DME-propane-air mixtures is influenced by overall equivalence ratio.
2008-03-13