Research On Diesel Particulate Filter (DPF) Capture And Regeneration Performance And Structural Parameter Optimization

The environmental problems brought about by social development are very prominent,western developed countries have experienced serious environmental pollution problems in the process of industrialization,China has also experienced similar problems in the process of industrialization.After the reform and opening up,China has made tremendous economic achievements,but the environmental pollution problem is also very serious,and environmental pollution problems will restrict economic development.In recent years,serious environmental pollution problems have occurred in many developed regions of China,and winter smoggy weather has occurred more frequently,seriously damaging people’s health.The emission of particulate matter from automobile exhaust is an important cause of smoggy weather.As the number of diesel vehicles increases,it is very necessary to control the particulate matter emissions of diesel engines.For particulate matter in automobile exhaust,diesel particle filter(DPF)and its regeneration technology are key technologies for dealing with particulate matter.The paper will study the influence of parameter changes on the DPF capture process.By analyzing the influence of structural parameters on the capture performance,the structural parameters of the DPF are optimized.In addition,the paper also studies the influence of the relevant parameter changes on the regeneration performance.The paper establishes a two-dimensional model of DPF,and uses the two-dimensional model to analyze the pressure and velocity inside the DPF.Considering the importance of flow field uniformity to DPF performance,this paper also studies the effect of the expansion angle and the flow velocity on the flow field uniformity.Since the user cares about the capture efficiency of the DPF,and the pressure drop across the DPF affects the performance of the diesel engine,the capture efficiency and pressure drop of the DPF are generally used as the capture performance indicators.The paper selected six parameters of filter length,diameter,pore density,filter wall thickness,filter wall micropore diameter and porosity,and analyzed the effects of their respective changes on the capture performance.Because the influence of structural parameters on the trapping performance is very complicated,it is very difficult to accurately obtain the relationship between thetrapping performance and the structural parameters by using the control variable method.In order to study the comprehensive influence of multiple structural parameters on DPF,the paper used GT-Power software to carry out experimental design,and carried out response surface fitting,fitting quality evaluation and analysis of variance.In addition,using the fitted response surface,the multi-objective Pareto optimization method is used to optimize the structural parameters.Finally,the paper analyzes the parameters related to regeneration performance and studies the effects of their respective changes on regeneration performance.