4634 炭化水素-空気混合気の燃焼特性に及ぼす雰囲気酸素濃度の影響に関する研究(G06-7 燃焼(1),G06 熱工学)

概要

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The release of NO_x, SO_x, HC and CO_2 from internal combustion engines is still a major issue in the development of modern engines. Especially new concepts like EGR(Exhaust gas recirculation) is developed, detailed information about the pollutant formation is required. However, the experiments of actual standard engines are generally very complicated processes including the residual gas of last cycle and the flow in an engine cylinder. Thus, experimental data measured using actual engines become unreliable. To obtain the essential data on combustion of hydrocarbon-N_2-O_2-mixtures, the experiments have been carried out to examine the influence of oxygen concentration on combustion characteristics under conditions of high temperature and pressure, which are achieved by a spark ignited opposed rapid compression machine. The main conclusions are follows: (1) The maximum burning pressure decreases with decreasing oxygen concentration at same EGR ratio. (2) The reduction ratio of the flame speed decreases with increasing the compression ratio. (3) The reduction ratio of flame speed depends on a fuel property.
2006-09-15