Abstract
Spray formation from diesel fuel injection through a realistic heavy-duty multi-hole injector plays a crucial role in the compression ignition engine performance. Fuel Spray characteristics influence the mixture formed in the combustion chamber which affects combustion. The present work is related to high-speed photography of fuel spray characteristics using biodiesel blends at different fuel temperatures. The spray cone angle, a time needed for full development of the spray cone, spray velocity
and spray penetration were the primary study parameters. Multi-hole injectors are of paramount importance concerning the CI engines. The purpose of this work is to reveal the effects of fuel temperatures and blend effect on the spray characteristics using biodiesel and diesel fuel. Special significance was that the highest vapor fuel mass concentration was observed at the center region of the spray axis with biodiesel at a higher temperature. This is believed to be due to an increase in the number of
small droplets that quickly evaporated. The mean axial velocity of droplets decreased with increasing fuel temperature. Spray penetration reduced with increasing order of fuel temperature.

Key words: Compression ignition engine; spray characteristics; biodiesel

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