Modeling And Analysis On Marine Diesel Engine NO_x Emission

Diesel engine with its obvious advantages in power and durability has become the main powerplant in the field of transportation.However,due to high emissions of nitrous oxides matter,its development and further application has been seriously challenged.Nowadays,studying and designing diesel engine will take reducing the NO_x emission as its theme.Among all these studies,optimizing operating parameters of diesel engine has magnificent significance on realizing the controlling of NO_x emission.This paper has explored how the primary parameters impact on the NO_x emission of this diesel engine by using computer simulation as its platform,based on building model and bench test of this engine.Major work of this paper is as follows:1.Under the platform of GT-Power,this paper has accomplished to model the V type of diesel engine,and certificate the model with test data from the test bench.Based on calculation of simulation,this paper has explored how compression ratio,the nozzle diameter,fuel injection advanced angle and air intake advanced angle of the diesel engine impact on its performance of the NO_x emission.2.Through combining simulation of GT-Power the modeling software and modeFRONTIER the multi-objective software,this paper has established a optimization model to optimize the NO_x emission.This model takes diameter of the nozzle,inject timing and air intake advanced angle of the diesel engine as input design variables.In the meantime,it takes maximum explosion pressure,efficient power and minimum specific fuel consumption as its constraint.Calculated with genetic algorithm this model has finally come to the most optimal combination of the input design variables.We could get the performance of the NO_x emission and the dynamic property and the efficient power of the diesel engine after inputting the most optimal parameters.3.Optimization results show that it’s effective to reduce the NO_x emission of diesel engine through adjusting its primary parameters.This optimization has also improved the efficient power and decreased the specific fuel consumption compared with original diesel engine,providing an efficient method to control NO_x emission.