Influence Analysis Of Different Structures On Temperature Of Microwave Regeneration And Mechanism Of Multi-field Synergy In The Diesel Particulate Filter

Diesel engines are used widely in the vehicle due to its advantage such as high thermal efficiency, reliability and good fuel economy. And it has become a worldwide hot issue that the high emission of particulate matters(PM) by diesel engines is causing damages to the environment and the health of human beings. It is well known that it is impossible to meet stringent emissions regulations only using the improvements of combustion technology in-cylinder combustion processes in the diesel engines. Currently, the diesel particulate filter(DPF) is considered as the most effective method to reduce the particulate matter emission from diesel engines and the regeneration is the most key technology of DPF. Microwave regeneration is one of promising method in the diesel particulate filter regeneration. At present, the regenerations of the DPF have been focused on heat regeneration technology and method of reducing ignition temperature of PM, but the influence of monolith structure on regeneration of the DPF is rarely reported in relevant literatures.Therefore, it is vital to do researches such as influence of monolith structure on regeneration temperature in the process of microwave regeneration in the DPF. Its results are not only beneficial to discrimination of heating regeneration in the diesel particulate filter but also can provide theoretical basis and technical support for the design of the diesel particulate filter with microwave regeneration.The thesis supported by national natural science fund project [51176045],which is “Research on optimization and mechanism of multi-field synergy in the composite regeneration of diesel particulate filter”. Using the method combined by numerical simulation method, experimental verification and field synergy theory to research the temperature characteristic and mechanisms of field synergy in different monolith structure on microwave regeneration. The main innovative points are as follows:(1)According to the regenerative property of microwave regeneration in the diesel particulate filter, the physical and mathematical calculation models are built. Three different monolith structures are designed and pressure characteristics of different monolith structures are studied which provide effectiveness for the research.(2)The established three different monolith structures model were solved by using FLUENT, and the temperature property of different monolith structures in differentvelocities are obtained which indicated the influence of monolith structure on regeneration temperature. The simulation results are good agreement with experiment results, so the correctness of the model is verified.(3)To build mathematical model in the process of microwave regeneration of diesel particulate filter by multi-field synergy theory. The change law and the property of the temperature gradients and the seepage velocity vectors of DPF were studied. The research result was expected to attach quite important referential value to the microwave regenerative performance of DPF and synergy optimization in different monolith structure.