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Abstract.

Ukudibanisa ukulinganisa kunye nobuchule obukhethekileyo bokulinga busetyenziselwe ukuphanda ukuhamba kwexesha elifutshane kunye ne-cavitation phenomena yesixhobo sokulawula ngaphakathi kwi-injector ephezulu ye-diesel. Ukuziphatha kwe-Dynamic cavitation kubanjwe kumzekelo omkhulu ocacileyo, owathi ke wasetyenziselwa ukuphuhlisa nokuqinisekisa imodeli ye-CFD ye-turbulence kunye ne-Large Eddy Simulation. Ezi ndlela zisetyenziswa ngaphakathi kweDelphi ukufumana ingqiqo kunye nokwandisa ukusebenza kwe-injector kubungakanani bokwenyani.

1. Intshayelelo

Isitofu se-diesel ngokungathandabuzekiyo yeyona nto ibalulekileyo ekufezekiseni ukusebenza kwe-injini yeprimiyamu ngokukhutshwa okuphantsi. Ngoko ke kulandela ukuba ii-injection zeenjini zokusebenza eziphezulu kufuneka zilawulwe ngokuchanekileyo. Ngenxa yoko, i-valve yokulawula i-hydraulic kunye ne-orifices kufuneka ziyilwe kwaye zenziwe ngokuchaneka okuphezulu, kwaye ukuqonda ukuziphatha kwabo okusisiseko kuya kunika igalelo elibalulekileyo kwinkqubo yokuphucula kunye nokulungiswa kakuhle. I-Delphi isebenzisa indibaniselwano yokulinganisa kunye neendlela ezikhethekileyo zokulinga ukuphanda iimpawu zokuhamba kwezi zixhobo.

Njengazo zonke ii-injection ezintsha, i-High Performance Diesel Injector phantsi kophuhliso eDelphi ibe ngumxholo womsebenzi omkhulu wokulinganisa. Eyona nto inika umdla kweli phepha, luphando lweCFD lwemisebenzi yolawulo lwehydraulic.

I-Flow cavitation sisihloko esiqhelekileyo kwizixhobo ze-diesel injection; amava ovavanyo lwangaphambili abonise ukuba umgangatho woshishino weReynolds-Average Navier-Stokes (RANS) awukwazanga ukunika iziphumo ezichanekileyo zokuziphatha kwe-cavitation enamandla. Yiyo ke loo nto ukongeza kumsebenzi weCFD, iimodeli ezinkulu (LSM) zamacandelo ahlukeneyo emisebenzi yolawulo lwehydraulic ziye zagunyaziswa. Ukusetyenziswa kweemodeli ezingafihliyo zeevalvu zolawulo kunye nee-orifices kwizikali ezandisiweyo kakhulu zenza ukuba kube nokuqonda okuphuhlileyo kokusebenza kwe-hydraulic [1] engenakufezekiswa ngokulula ngezinye iindlela. Ukusebenza kwehydraulic kuzimele ngokwaneleyo kuzo zonke izikali ukuba zibe luncedo njengesixhobo sophuhliso.