Abstract
In this work, an effective numerical simulation method was developed and used to analyze the effects of natural gas mixing ratio and pilot-main injection, main-post injection, and pilot-main-post injection strategies on the combustion and emission characteristics of diesel engine fueled with dual fuel. Firstly, the one-dimensional calculation model and three-dimensional CFD model of the engine were established by AVL-BOOST and AVL-Fire, respectively. In addition, the simplified chemical kinetics mechanism was adopted, which could accurately calculate the combustion and emission characteristics of the engine. The results show that the cylinder pressure and heat release rate decrease with the increase of the natural gas mixing ratio and the NOx emission is reduced. When the NG mixing ratio is 50%, the NOx and CO emission are reduced by 47% and 45%, respectively. When the SODI3 is 24 °CA ATDC, the NOx emission is reduced by 29.6%. In addition, with suitable pilot-main injection and pilot-main-post injection strategies, the combustion in the cylinder can be improved and the trade-off relationship between NOx and soot can be relaxed. Thus, the proper main-post injection strategy can improve the combustion and emission characteristics, especially the reduction in the NOx and CO emissions.
Highlights
Droplet wall interaction has greatly influenced the direct injection engine, especially for some diesel engines with small cylinder diameter, which will cause most of the fuel atomization evaporation and wall collision at the same time, making the combustion and emission in the simulation results and the test error larger, for instance, incomplete combustion of fuel will worsen the emission of carbon hydride and soot particles
The results show that the cylinder pressure, heat release rate (HRR), nitrogen oxides (NOx), and carbon monoxide (CO) emissions obtained by numerical simula‐
The results show that cylinder pressure, HRR, NOx, and CO emissions obtained by numerical simulation
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Shen et al [29] had carried out numerical researches on four different piston clearances and piston geometry, pointing out that the main source of carbon hydride emission of NG-diesel dual-fuel engine was similar to spark-ignition engine mainly caused by piston gap. Yousefi et al [32,33,34] have carried out important research from the aspect of fuel injection strategy to explore the effects of post-injection strategy on greenhouse gas emission of dual-fuel engine under high load. They found the split injection and injection timing are important. The corresponding cases of different NG mixing ratios and different injection strategies were simulated by a
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
