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In order to study a new clean and efficient combustion mode, which can  relieve the pressure of traditional energy and ensure low emissions, in this  study, a diesel/natural gas dual fuel engine is designed by non-dominant  sorting genetic algorithm (NSGA - Ⅱ ), and its thermodynamic characteristics  are studied. The WP10.290 diesel engine is modified into a diesel/natural  gas dual fuel engine. The emissions of harmful substances and thermal  efficiency of the modified engine under different working conditions are  compared. The combustion chamber structure and adaptability between  combustion chamber and injection parameters are optimized by using NSGA-II  algorithm and Computational Fluid Dynamics (CFD) software. The results show  that the emission of NOx and CH4 and the fuel consumption rate can be  reduced simultaneously by using the composite combustion model compared with  the original engine. When the methane emission is close to zero, the fuel  consumption rate decreases obviously. NOx slightly increases. When the angle  between the injection holes is 141.57°, the amount of No in the cylinder is  large. When the injection advance angle is 21.91°CA, the pressure in the  cylinder is the highest, the CH4 production is the lowest, the NOx  production is higher, and the oxygen content in the combustion mixture is  less. No production is the lowest. Diesel / natural gas dual fuel engine can  ensure efficient combustion while reducing emissions. In this study, the  performance of the dual fuel engine at various speeds can be further  studied, which can provide theoretical support for the design of diesel/natural gas dual fuel engine.

Design of new clean and efficient combustion mode and thermodynamics research using NSGA-II algorithm