二冲程低速柴油机工作过程与增压系统的计算研究

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1、上海交通大学硕士学位论文二冲程低速柴油机工作过程与增压系统的计算研究姓名：丰琳琳申请学位级别：硕士专业：动力机械及工程指导教师：邓康耀20070201上海交通大学硕士学位论文摘要在对已造二冲程低速柴油机7K90MC-C的性能进行模拟研究的基础上，进一步对准备制造的二冲程低速柴油机12K98MC-C进行性能预测计算，分析了该机可达的性能指标，并对鼓风机切换规律进行计算分析，预测了低负荷时鼓风机的切换点。关键词：低速柴油机，二冲程，扫气过程，鼓风机II上海交通大学硕士学位论文AbstractSimulationStudyonWorkPr

2、ocessandTurbochargingSystemofTwo-strokeLow-speedDieselEngineAbstractStudyonworkprocessandturbochargingsystemoftwo-strokelow-speeddieselengineissignificantformarineenginematchingandperformanceimprovingofourcountry.Basedontheanalysisofenginestructure,anengineperformances

3、imulationmodelwasdevelopedaccordingtotheMANB&W7K90MC-Ctwo-strokelow-speeddieselengine,whichwasmadebyShanghaiHudongHeavyMachineryCo.,Ltd...Thesub-modelsinthesimulationoftwo-strokelow-speeddieselenginewereanalyzedindetailandthemethodtoaccuratesimulationwasdeveloped.Thisp

4、aperstudiedtheeffectsofdifferentscavengingmodelsonsimulation.Theresultsshowedthatthe“combinedscavenging”modelismoresuitableforthe7K90MC-Cdieselengine.Thecombustionmodelofnowadaystwo-strokelow-speeddieselenginewasdiscussed.Accordingtothemeasuredcylinderpressureof7S60MC-

5、Cand6S70MCdieselengines,thecharacteristicsofheatreleaseratewereanalyzed.Anewcombustionmodelwassetupandtheresultswereconsistentwithexperiments.Turbochargermatchingmethodwasdeveloped.Theturbochargerparametersof7K90MC-Cdieselenginechosenbythismethodweresimilarwiththedatap

6、rovidedbytheforeigncompany.Theperformancesof7K90MC-Cdieselengineatpartandratedloadweresimulatedusingthedevelopedmodel.TheresultsshowedthattheIII上海交通大学硕士学位论文Abstractsimulationcanbeconsistentwiththeexperimentandthesimulationmodelisaccurate.Basedonthesimulation,theexhaust

7、valvetimingwasoptimizedandtheeffectsofintakeportheightonscavengingprocesswerediscussed.Inordertoresolvethestart-upandlow-loadproblemsoftwo-strokelow-speeddieselengine,theblowermatchingwasstudiedbysimulation.Thechoosingandoptimizingofblowerswereanalyzed.Theswitchrolesof

8、theenginewithtwooroneblowerswerediscussed.Afterthesimulationstudyontheperformanceofthemadeengine—7K90MC-Ctwo-strokelo