Effect of injection pressure on the performance of a marine diesel engine blended with Low-carbon biodiesel

In order to deeply study the performance of biodiesel blending in marine diesel engines, the effects of different fuel injection pressures on the oil-gas mixing, combustion and emission of the fuel blended with a small percentage of biodiesel were investigated using the CONVERGE simulation software. Based on the simulation software CONVERGE, the three-dimensional model of the combustion chamber of the test marine diesel engine was established, the RNG k-ε model and the correct biodiesel chemical reaction mechanism were selected, and the simulation results were compared with the test results to ensure the accuracy of the simulation results. The results show that: the increase of fuel injection pressure can enhance the average turbulence intensity in the cylinder as well as increase the relative flow rate between oil and gas, and also promote the flame propagation, thus increasing the maximum burst pressure and the average temperature in the cylinder; in terms of the emission, the generation of carbon soot is suppressed with the increase of injection pressure, but the emission of nitrogen oxides is deteriorated.