\r姚春德，王 辉，姚安仁，王 斌，李壮壮，刘明宽\r
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AuthorsHTML:\r姚春德，王 辉，姚安仁，王 斌，李壮壮，刘明宽\r
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AuthorsListE:\rYao Chunde，Wang Hui，Yao Anren，Wang Bin，Li Zhuangzhuang，Liu Mingkuan\r
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AuthorsHTMLE:\rYao Chunde，Wang Hui，Yao Anren，Wang Bin，Li Zhuangzhuang，Liu Mingkuan\r
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Unit:\r天津大学内燃机燃烧学国家重点实验室 天津 300072\r
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Unit_EngLish:\rState Key Laboratory of Engines，Tianjin University，Tianjin 300072，China\r
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Abstract_Chinese:\r\r为探究带预喷的柴油多次喷射对柴油\r/\r甲醇组合燃烧\r(\rdiesel methanol compound combustion\r，\rDMCC\r)\r船舶发动机性能、燃烧和排放的影响，在一台船舶柴油机进行\rDMCC\r模式改造的基础上，选择该发动机推进特性常用的\r3\r个工况点开展了纯柴油模式和双燃料模式下有无预喷的试验研究．\r3\r个工况点分别为发动机\r25\r%\r、\r50\r%\r和\r75\r%\r额定功率点．研究结果表明，发动机采用带预喷的喷射策略可以使双燃料模式下的甲醇替代率大幅提升，并使当量比油耗降低，且负荷越大，当量比油耗降低越多．采用预喷策略后，发动机在两种燃料模式下的燃烧开始时刻都会提前，但在双燃料模式时提前更多，同时双燃料模式下的放热率峰值和压升率峰值大幅降低，燃烧定容度增加，热效率提高．此外，预喷策略可以使双燃料模式下的\rNO_x\r排放大幅降低，\r3\r个工况点分别降低\r24.97\r%\r、\r37.98\r%\r和\r40.02\r%\r；\rPM\r(\rparticulate matter\r)\r排放略有增加，但仍低于纯柴油无预喷模式．\r\r
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Abstract_English:\r\rTo investigate the effect of pilot injection on the performance\r，\rcombustion\r，\rand gas emissions of marine diesel/methanol compound combustion\r(\rDMCC\r)\rengines\r，\ra marine diesel engine was modified into the one featuring DMCC combustion mode\r．\rFurther\r，\rbench tests for the marine DMCC engine were conducted in pure diesel mode and diesel/methanol dual fuel mode under three normally used operating cases\r，\ri.e.\r，\r25\r%\r，\r50\r%\r，\rand 75\r%\r of the full load with propeller characteristics\r．\rThe testing results display that\r，\rin dual fuel mode\r，\ra pilot injection strategy can significantly increase methanol replacement rates and reduce brake specific fuel consumption\r(\rBSFC\r)\r．\rMoreover\r，\rthe higher the load\r，\rthe larger the reduction in BSFC\r．\rWhen the pilot injection strategy was applied\r，\rignition was initiated earlier\r；\rthis change was more obvious in dual fuel mode than in pure diesel mode\r．\rWhen the pilot injection strategy was applied in the dual fuel mode\r，\rthe peaks of the heat release and pressure rise rates remarkably declined\r；\rat the same time\r，\rthe constant volume combustion ratio and the thermal efficiency increased\r．\rAnd NO_x emissions remarkably decreased in dual fuel mode by 24.97\r%\r，\r37.98\r%\r，\rand 40.02\r%\r for 25\r%\r，\r50\r%\r，\rand 75\r%\r operating cases\r，\rrespectively\r．\rFurther\r，\rPM emissions increased slightly but remained lower than that in pure diesel mode without pilot injection\r．\r\r
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Keyword_Chinese:预喷策略；双燃料船舶发动机；燃烧；PM；NO\r_x\r

Keywords_English:pilot injection strategy；dual fuel marine engine；combustion；PM；NO\r_x\r


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