渦輪增壓器噴嘴葉片低流損翼形型線設(shè)計(jì)計(jì)算方法研究.pdf

1、摘要本文是以濟(jì)南柴油機(jī)廠4190ZLC柴油機(jī)的增壓器為研究對(duì)象，首先利用ProE對(duì)原來增壓器蝸殼和噴嘴環(huán)進(jìn)行三維建模，然后在AVL公司的CFD軟件FIRE中對(duì)蝸殼和噴嘴環(huán)劃分網(wǎng)格并進(jìn)行流體的三維流場模擬計(jì)算，得到內(nèi)部流動(dòng)的模擬結(jié)果，然后通過對(duì)計(jì)算結(jié)果進(jìn)行分析，清楚地了解蝸殼及噴嘴內(nèi)部的流動(dòng)情況，繼而找出噴嘴環(huán)對(duì)蝸殼內(nèi)流動(dòng)的影響因素及影響的大小，接著便可以找到需要優(yōu)化的部位。下一步的工作是參考模擬計(jì)算的結(jié)果，并引入雙紐線流量計(jì)工作原理作為

2、參考的設(shè)計(jì)思想，然后可以有針對(duì)性地設(shè)計(jì)出幾種對(duì)流動(dòng)影響較小、流動(dòng)損失小的型線，進(jìn)而將這種型線作為噴嘴環(huán)片的頭部來設(shè)計(jì)新的噴嘴環(huán)葉片。型線確定之后，便可對(duì)幾種新設(shè)計(jì)的噴嘴環(huán)以及每種型線下不同安裝角的模型分別進(jìn)行了F工RE三維流場模擬計(jì)算，之后對(duì)各個(gè)方案的結(jié)果數(shù)據(jù)進(jìn)行多方面的比較，綜合考慮從中得到比較理想的型線。將確定好的噴嘴環(huán)型線的數(shù)據(jù)文件輸出，然后委托濟(jì)南柴油機(jī)廠利用線切割機(jī)加工出噴嘴環(huán)片和噴嘴環(huán)座，并保證兩者的過渡配合。將裝配好的增壓

3、器和原來的增壓器一并在濟(jì)柴4190ZLC柴油機(jī)上進(jìn)行實(shí)際配機(jī)試驗(yàn)，通過對(duì)增壓器的效率以及發(fā)動(dòng)機(jī)功率、扭矩、油耗等數(shù)據(jù)的分析，對(duì)新設(shè)計(jì)方案和原增壓器進(jìn)行比較，并結(jié)合F工RE的模擬計(jì)算結(jié)果進(jìn)行綜合分析，可以看到新設(shè)計(jì)的噴嘴葉片對(duì)增壓器的效率有一定的提高。并總結(jié)低流損翼行型線葉片的設(shè)計(jì)方法.通過全文的研究可以得出以下結(jié)論:利用Fire模擬蝸殼內(nèi)和噴嘴環(huán)的三維流動(dòng)是比較準(zhǔn)確的，能夠反映流動(dòng)的實(shí)際情況，作為優(yōu)化增壓器的數(shù)值模擬工具是完全可行的。而

4、且利用數(shù)值模擬計(jì)算來選型能縮短優(yōu)化設(shè)計(jì)的周期。翼形噴嘴環(huán)的效率相對(duì)于平板形和圓弧形的效率是最高的。模擬計(jì)算和試驗(yàn)的結(jié)果說明本文中設(shè)計(jì)的雙紐線形式頭部的噴嘴環(huán)葉片的效率相對(duì)于原方案是有明顯提高的。翼形的葉片對(duì)提高蝸殼的效率有著關(guān)鍵的作用，但安裝角的大小也是至ABSTRACTInthispaperasthestudiedobjectfirstlythethreedimensionalmodeloftheturbochargerissetup

5、usingProEwhichisusedinthe4190ZLCdieselmadeinJinanDieselFactory.SecondlythemeshesofthevoluteandvanesaremeasuredoffandthethreedimensionalflowfieldissimulatedbyFirewhichisaCFDsoftofAVL.Aftertheresultsofthreedimensionalflowa

6、reobtainedwecananalyzetheseresultsandgaintheactualthingsoftheinteriorofturbocharger.Thereforethefactorswhichinfluencetheflowofvoluteandvanesarefoundaswellastheextentofthefactors.Correspondinglythepartsofvaneswhichneedbeo

7、ptimizedarefoundeasily.Thenextdutyisdesigningseveraldifferentcurveswhichcanworklessflowlossthantheformerreferringtheresultsofsimulationandintroducingtheideaoflemniscatesflowmeterthenusethesecurvesasthetoppartofvanes.Inth

8、iswaythewholecurvesofvanesaregained.ThereforethenewdesigninganddifferentfixinganglecasesareallsimulatedusingFirethentheresultsofsimulatingarecomparedallsidedandthebestcaseisfoundthroughconsideredroundly.Andthenexportthed

9、ataofthenewvanescurvesfromAutoCADwhichisusedtoprocessthevanesbythewirecutmachine.NextcommissionsJinanDieselFactorytomachiningthevanesandthebaseandensurethelessinterferencefit.Testthenewdesignedturbochargerswhichareassemb

10、ledonthe4190ZLCdieselonebyoneByanalysisthedatatheefficiencyofturbochargerthepowerthemomentandthefuelconsumptionofenginetogetherwiththeresultsofsimulationswecanfindthenewdesignedvanesenhancetheefficiencyofturbochargerandt