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1、SHIPENGINEERnG船舶工程Vol-36No.420l4總第36卷,2014年第4期米勒循環(huán)對(duì)船用低速柴油機(jī)J陛能影響的仿真研究王筱蓉,劉辰朋,尹子峰2,尹升奇2(1.江蘇科技大學(xué)機(jī)械工程學(xué)院,江蘇鎮(zhèn)江212003;2.滬東重機(jī)有限公司,上海200129)摘要:針對(duì)節(jié)能減排對(duì)船舶行業(yè)所具有的重要意義,對(duì)應(yīng)用米勒循環(huán)技術(shù)的某型船用低速柴油機(jī)進(jìn)行了模型驗(yàn)證與仿真計(jì)算,分析了米勒循環(huán)強(qiáng)弱對(duì)柴油機(jī)性能的影響,給出了米勒循環(huán)強(qiáng)弱對(duì)柴油機(jī)缸內(nèi)壓力、溫度、放熱率及NO排放的影響規(guī)律,并對(duì)船用低速柴油機(jī)的綜
2、合性能進(jìn)行了評(píng)估。研究結(jié)果表明:米勒循環(huán)強(qiáng)弱對(duì)柴油機(jī)缸內(nèi)溫度及放熱率具有較大影響,控制米勒循環(huán)強(qiáng)弱能夠顯著降低NO的排放,排氣閥每晚關(guān)10~CA,NOx生成量降低6%~7%,當(dāng)米勒循環(huán)增加到一定程度時(shí),繼續(xù)加強(qiáng)米勒循環(huán)將在降低NOx排放的同時(shí),導(dǎo)致燃油經(jīng)濟(jì)性降低且需高壓比的增壓器匹配,使得配機(jī)成本增加,這些結(jié)論將為船用低速柴油機(jī)的進(jìn)一步開發(fā)提供參考。關(guān)鍵詞:米勒循環(huán);船用低速柴油機(jī);性能分析;仿真計(jì)算中圖分類號(hào):U664.121.2:TK402文獻(xiàn)標(biāo)志碼:A文章編號(hào):1000.6982(2014)0
3、4.0029.05SimulationStudyonPerformanceEfectofMillerCycleonMarineLow—speedDieselEngineWANGXiao.rong,LIUChen.peng,Y1NZi—feng2,YINSheng.qi(1.InstituteofMechanicalEngineering,JiangsuUniversityofScienceandTechnology,JiangsuZhenjiang212003,China;2HudongHeavyM
4、achineryCo.,Ltd.,Shanghai200129,China)Abstract:ForimportantmeaningofEnergysavingandemissionreductiononshipindustry,modelvalidationandsimulationresearchofatypeofLow-speeddieselenginewhichappfiesMillercycletechnologyhavebeendone,andinfluenceofMillercycle
5、strengthondieselengineperformancehasbeenanalyzed,theefectofMillercyclestrengthondieselenginecylinderpressure,temperature,radiatesrateandtheNOxemissionshavebeengiven,integratedperformanceonshipwithLow-speeddieselenginehasbeenestimatedTheresearchresultsh
6、owsthatMillercyclestrengthhaslargerimpactondieselenginecylinderinnertemperatureandtheradiatedrate,controlMillercyclestrengthcansignificantlyreduceNOxem&sion,andexhaustvalveclosesIO~CAlardyeach,NOxgenerationvolumecanbereducedby6%~7%whenMillercycleincrea
7、sestoacertainlevelstrengtheningMillercyclewillleadtofueleconomydroppingandneedtomatchhighpressureboosterwhileNOxemissionreduction,andtomakemachinecostincrease,Theseconclusionswillprovidereferenceforthefurtherdevelopmentofmarinelow-speeddieselengine~Key
8、words:millercycle,"marinelow-speeddieselengine,"performanceanalysis,"simulationcalculationTierII法規(guī)已于2011年起執(zhí)行。其對(duì)船用主機(jī)來(lái)完成,由于排氣閥晚關(guān)導(dǎo)致的缸內(nèi)新鮮空氣充量不NO排放物提出更嚴(yán)格的要求。當(dāng)前用于降低NO足,Miller和Lieberhem提出通過提高進(jìn)氣壓力來(lái)補(bǔ)排放的技術(shù)主要有米勒循環(huán)技術(shù)、電控燃油噴射系統(tǒng)、償米勒循環(huán)工作過程造成的進(jìn)氣充量不足[1一J