Experimental Investigation of the Effect of Diesel-Biodiesel Blends on Brake Torque Characteristics and Specific Fuel Consumption in Diesel Engines

The number of diesel engines is increasing every year due to high yield and fuel economy and low greenhouse gas emission. Especially biodiesel and ethanol have been considered as major alternative fuels as they are derived from renewable sources. These fuels are well oxygenated and therefore have a great potential to reduce emissions. Material and

The effect of engine load and speed and different percentages of diesel-biodiesel fuel blends on the performance characteristics of a diesel engine was investigated. Experiments were designed by response surface method (RSM), and optimal levels for independent variables were obtained to minimize or maximize response levels.

According to the results, brake torque increased with increasing biodiesel level in fuel blends. Among independent variables, engine load and speed had the greatest impact on engine torque. The maximum torque was obtained for the fuel blend D36B64. Specific fuel consumption increased with increasing biodiesel level in fuel blends in comparison with the diesel fuel. The least specific fuel consumption was obtained for pure diesel fuel. Discussion and

According to the results, the highest torque was 315.55 Nm for fuel (D36.12B63.88) and the lowest torque was 44 Nm for pure diesel fuel (D100B0). According to fuel consumption results, the lowest fuel consumption occurs at 2323 rpm and for pure diesel fuel (D100B0). Also, the highest specific fuel consumption occurs at 67% engine load and 2800 revolutions per minute for pure biodiesel fuel (D0B100) at 304 g / kW. The results of multi-objective optimization indicated that the highest performance characteristics occurred at full load (100%) and engine speed of 1984 rpm for the fuel blend D22B78 (with a desirability of 91%).