This paper presents the effect of the main parameters of fuel injection, such as injection angle and injector opening time, on the combustion process in a self-ignition engine. The study continues the research aimed at optimising the bi-fuel feeding of self-ignition engines with a main fuel dose of methane (CNG). The results described in the paper apply to a HATZ 1B40 one-cylinder engine, which was adapted for being powered with methane. Examinations of the engine powered with a pilot dose of mechanically-injected diesel oil revealed the necessity to adjust the fuel injection advance angle. To this end, the mechanical system offuel supply was replaced with a Common Rail, with controllable fuel injection pressure, fuel injection advance angle and injector opening time. The results presented in the paper show the characteristics of the injector output depending on the fuel pressure in the Common Rail and on the duration of the electric impulse which opens the injector. Moreover, the article presents examples of pressure courses in the combustion chamber at a constant fuel dose and with a different fuel injection advance angle. An example of the combustion pressure course at a constant fuel dose and variable injection pressure and injector opening time is given.
It was proven that fuel injection advance angle has an effect on temperature state of diesel engine piston. This effect is significant and commensurable with the piston oil cooling effect. The methodology for determining boundary conditions of piston heat exchange that considers fuel injection advance angle was developed. Empiric dependency of heat transfer in piston CC from diesel power and fuel injection advance angle is offered. The results of temperature state of diesel piston 4ЧН12/14 are represented at different engine boost levels, fuel injection advance angle and structure oil-cooling methods.
PL
Wykazano, że stan cieplny tłoka zależy od kąta wyprzedzenia wtrysku oleju napędowego. Efekt ten jest istotny i współmierny z efektem chłodzenia tłoków olejem smarującym. W pracy przedstawiono empiryczną zależność przewodzenia ciepła w komorze spalania tłoka silnika o zapłonie samoczynnym od kąta wyprzedzenia wtrysku paliwa. Artykuł zawiera również wyniki badań stanu cieplnego tłoka silnika o zapłonie samoczynnym 4ChN12/14 dla różnych wartości obciążenia, kąta wyprzedzenia wtrysku paliwa i konstrukcji systemu chłodzenia olejem.
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