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某LNG发动机进气补气对缸内过程的影响

Chinese Internal Combustion Engine Engineering(2017)

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Abstract
对一台增压、火花点燃液化天然气(LNG)发动机的进气系统加装一套补气装置并进行试验,连续记录补气过程中进气压力、空燃比、燃料质量流量和缸内动态压力等体现缸内燃烧及热功转化过程的瞬变参数.通过分析实测燃烧放热率(ROHR),揭示了瞬变状态下发动机空燃比、燃料质量流量和进气压力等运行参数对燃烧特征参数的影响,指出燃烧推迟、失火和平均指示压力(IMEP)波动等燃烧失常现象,并得出这些现象的产生原因.研究结果表明:无论是稳态工况还是瞬态工况,LNG发动机的燃烧过程主要由过量空气系数决定.
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