天然ガス予混合圧縮自己着火機関の性能及び排気特性に及ぼす内部EGRの影響(熱工学,内燃機関,動力など)

概要

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Besides the narrow operation range, natural gas fueled HCCI engine requires higher compression ratio and pre-heated air due to the low Cetan number. In this study, influences of the internal EGR ratio on the performance and the emissions of a single cylinder engine were investigated. Although the internal EGR lowers the permissible temperature of the intake air, it also decrease the indicated thermal efficiency. This is attributed to the increase of heat loss and pumping loss. The effect of internal EGR varies depending on the air temperature. At high air temperature, it increase the combustion duration. By contrast, at low temperature it increases the inner gas temperature at the start of compression phase, and thus, decreases the combustion duration. Under the turbo charged condition, the indicated thermal efficiency and the indicated mean effective pressure are increased. Those are attributed to the decreases of the heat loss.
社団法人日本機械学会の論文
2005-10-25