The paper presents two components of developed quasi-dimensional numerical model: spray package penetration and gas inflow from the zone without combustion into the spray packages. Correction of spray package penetration along the fuel spray radial axis is presented and described numerically. Numerical model simulation is validated in several measured operating points of direct injection diesel engine, after which the simulation results are presented. According to numerical model settings, each fuel spray was divided into packages (control volumes). In the same time interval, the shortest penetration was obtained for spray packages located at the fuel spray edge. Before reaching the break-up time spray package penetration was linear and after reaching the break-up time, package penetration had a curved form. Later injected spray packages quickly reached and surpassed earlier injected spray packages because earlier injected spray packages hit “gas wall” in the engine cylinder and they were “braked” with surrounding gas in comparison to packages injected later. Gas inflow from the zone without combustion into the spray packages is the most intensive for spray packages positioned at the fuel spray edge. The simulation shows that the inflow mass from the zone without combustion increases for spray packages injected later.; Istraživanje prikazuje dvije esencijalne komponente razvijenog kvazidimenzijskog numeričkog modela: penetraciju mlaza goriva i domješavanje plina iz zone bez izgaranja u pakete mlaza goriva. Prikazana je i numerički objašnjena korekcija penetracije paketa mlaza goriva duž radijalne osi mlaza. Numerički model validiran je u nekoliko izmjerenih radnih točaka analiziranog dizelskog motora s direktnim ubrizgavanjem goriva, nakon čega su prikazani simulacijski rezultati. Prema standardnim postavkama numeričkog modela svaki mlaz goriva podijeljen je u pakete (kontrolne volumene). U istom vremenskom intervalu najkraća penetracija ostvarena je za one pakete koji se nalaze na periferiji mlaza goriva. Prije dostizanja vremena raspada mlaza goriva u kapljice penetracija svakog paketa mlaza goriva linearna je da bi, nakon dostizanja vremena raspada, penetracija svakog paketa dobila zakrivljenu formu. Kasnije ubrizgani paketi mlaza goriva vrlo brzo dostižu i prestižu ranije ubrizgane pakete jer ranije ubrizgani paketi nailaze na velik otpor svojem gibanju u cilindru motora te su na taj način „zakočeni“ u usporedbi s kasnije ubrizganim paketima. Domješavanje plina iz okolne zone bez izgaranja u pakete mlaza goriva najintenzivnije je za pakete koji se nalaze na periferiji mlaza goriva (najbliže zoni bez izgaranja). Numerička simulacija pokazuje da masa plina koja iz zone bez izgaranja ustrujava u pakete mlaza goriva raste kod kasnije ubrizganih paketa mlaza goriva.