Experimental investigation to optimize nozzle geometry and compression ratio along with injection pressure on single cylinder DI diesel engine operated with AOME biodiesel

With the increase in population, energy demand is more in the automotive sector. Soaring prices and extinction of fossil fuels are reasons why researchers are focusing more on alternatives. This research work carried out on a single-cylinder DI diesel engine running on AOME biodiesel aims to optimize the nozzle geometry, the compression ratio and the injection pressure. The experiment on transesterified AOME biodiesel/diesel blends B80D20, B60D40, B40D60, and B20D80 was evaluated against pure diesel. 4 and 3 hole fuel injectors of 0.25 mm and 0.20 mm diameter respectively are used in the experimental study with 240 and 260 bar IOP at compression ratios 16.5:1 and 17.5:1 for optimization. The results of the experimental investigations prove that for biodiesel blends, the brake thermal efficiency is slightly lower and the smoke emissions are reduced compared to diesel. In addition, the results prove that at 260 bar IOP, the 4 hole, 0.25 mm diameter fuel injector at a compression ratio of 17.5:1, the B40D60 blend gives improved results against all blends in case of brake thermal efficiency and smoke emissions. Finally, these are the most efficient and optimized conditions for the biodiesel blend by improving brake thermal efficiency (25.43%) and reducing smoke emissions (53HSU). [Display omitted] •Engine test conducted for AOME bio-diesel blends at part load condition.•Nozzle geometry and compression ratios were optimized.•Brake Thermal efficiency was improved for B40D60 blend.•Smoke emission was decreased for B40D60 blend.•The optimized blend is B40D60 at 260 bar IOP, 17.5:1 CR and 0.25 mm nozzle dia.