Biodegalų pradinio įpurškimo slėgio įtaka dyzelinio variklio darbo rodikliams

The article presents the bench testing results of an air cooled, one cylinder diesel engine F1L511 (12.8 kW) when operating on diesel fuel and its various blends with rapeseed oil. The rapeseed oil and diesel fuel blends BS, B10 and BIS have been tested. The analysis of the brake mean effective pressure (bmep), brake specific fuel consumption (bsfc), thermal efficiency of the engine (ηe) and temperature of the exhausts was conducted for 3000 min'1 speed and air-to-fuel equivalence ratio α = 2.0. The biggest bmpe = 0.408 MPa can be developed when initial diesel fuel injection pressure increases from 180 to 200 bar. In this case, the brake specific fuel consumption decreases from 348.9 to 293.8 g/kWh (15.81 %). In result, the brake thermal efficiency of the engine increases to maximum value of η = 0.28. However, at higher fuel injection pressure the brake thermal efficiency decreases with the content of rapeseed oil in the blend. The temperature of the exhausts is lower (550 K) from biodiesel (B15) compared to that (610 K) of base diesel fuel and it is less dependent on the injection pressure of biofuelVytauto Didžiojo universitetasŽemės ūkio akademij