CFD analysis of combustion and emissions to study the effect of compression ratio and biogas substitution in a diesel engine with experimental verification.

摘要

Advanced computational fluid dynamics (CFD) simulations of engine reacting flow processes have emerged as a complementary and efficient design tool for the development of the next-generation engines. Many of the early multi-dimensional CFD attempts to predict engine combustion rates were conducted using simplified chemistry. In the present study, Biogas-Diesel dual fuel combustion CFD analysis is carried out using FLUENT software to study the effect of Biogas substitution on turbulent kinetic energy, Turbulent Dissipation Rate, Combustion flame velocity, and NOx formation for five compression ratios. For Turbulence analysis, RNG ?-e model is used, which is further modified for the dual fuel analysis. Meshing of the combustion chamber is carried out using GAMBIT, by tetrahedral element using cooper tool. To analyze the effect of compression ratio in dual fuel mode, compression ratios were varied along with Bio-gas substitutions. To validate CFD results, experimental investigations were carried out, which showed a good agreement between the predicted and experimental results.