Investigating the performance and emissions of a diesel and liquid petroleum gas (LPG) mixture injected in a combustion nozzle has become an area of interest for researchers and manufactures aiming for a sustainable development, where economic and environmental issues are addressed.

This paper uses computational fluid dynamics (CFD)- combustion techniques in analyzing various LPG percentages added to diesel in a combustion process. Results were obtained for energy output and temperature of exhaust gas. Emissions, such as carbon dioxide, carbon monoxide, and nitrogen oxides, were also recorded. Equations were derived from the results obtained, avoiding lengthy stoichiometric calculation methods.The developed equations relate LPG and diesel fuel mass injected with the equation’s output giving results for total energy, total combustion temperature, CO,CO2, and nitrogen oxides. The accuracy of equations was assessed on a statistical basis. The conclusion shows how CFD-combustion software tools can be used to produce simple equations to calculate the output of a combustion process, avoiding lengthy traditional stoichiometric calculations.