シリンダ内直接水噴射による予混合圧縮着火機関の運転領域拡大(熱工学,内燃機関,動力など)

概要

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The control of ignition and combustion behavior in a premixed charge compression ignition engine was investigated and ultra low NO_x and smokeless combustion was achieved with direct in-cylinder injection of water as a reaction suppressor. The reaction suppressing effect increased with advancing injection timings of the suppressors, resulting from greater decreases in charge temperature as compression progressed. However, as the in-cylinder temperature was less than the water boiling point before 60° CA BTDC, water vaporization was delayed with too early injection timing and the suppressing effect decreased. Therefore, the optimum timing in terms of the suppressing effect was found at 60° CA BTDC thereabouts when the in-cylinder gas temperature reached the boiling point of water. The water injection significantly reduced the heat release at cool flame, which suppressed the increase in charge temperature after the cool flame and the rapid combustion caused by the hot flame.
一般社団法人日本機械学会の論文
2002-01-25