Abstract:Combustion diagnosis results show that when using methanol or ethanol fuel

the miniature internal combustion engine with glow-ignition has higher level of cyclic variations

lower rate of heat release and longer combustion duration.So

adding additives of nitromethane and hydrogen peroxide were investigated.With the additive of nitromethane

the start of combustion (SOC) is advanced

the combustion velocity is improved and the coefficient of variation is reduced.However

the combustion characteristics become poor when the hydrogen peroxide is added to the fuel.In order to analyze the effects of nitromethane on the combustion

experiments of adding different proportions of nitromethane to methanol fuel and ethanol fuel were investigated.Under the glow-ignition condition with alcohol fuels

the nitromethane affects its indicated mean effective pressure and characteristic of cyclic variation by the adjustment of SOC.Adding nitromethane makes the SOC advance and let the combustion duration shorten that lead to the decrease of cycle-by-cycle variation. While with high proportion of nitromethane

the SOC tends to become more dispersed and the cycle-by-cycle variations become more severe

which result in performance degradation.