Study On Chemkical Kinetic Model Of PODE3 And Diesel Blend Fuel

The reduction in fossil fuel reserves and the increase in environmental pollution have made the demand for alternative fuels for internal combustion engines more and more urgent.As a kind of ether fuel with simple production and convenient storage,PODE3 has the advantages of similar cetane number to diesel oil and high oxygen content ratio.It is considered as an ideal diesel alternative fuel for internal combustion engines.At present,there are few reports on the PODE3/diesel combustion mechanism model.Therefore,in this paper,a simplified' mechanism of the combustion chemistry kinetics of a PODE3/diesel blended fuel is constructed through a variety of methods,and the mechanism of the construction is verified and analyzed.The simplified mechanism of the chemical kinetics of the PODE3/diesel blend fuel consists of the n-heptane sub-mechanism,the n-butylbenzene mechanism,the PAH generation mechanism,the NOx formation mechanism,and the PODE3 sub-mechanism.Among them,the n-heptane sub-mechanism is simplified from the basic fuel mechanism of PRF;the n-butyl benzene sub-mechanism is simplified on the basis of detailed mechanism through direct relation graph method,reaction path analysis and sensitivity analysis,and the main consumption path is preserved.Soot precursors generated from the reaction;Based on this,a well-developed PAH and NOx formation mechanism was added,and a multi-component n-butylbenzene/n-heptane diesel mechanism containing 136 components and 542 reactions was finally obtained.In the same way,the direct relationship diagram method,path analysis method,and sensitivity analysis method are used to simplify the process of obtaining the PODE3 oxidation reaction mechanism.After path analysis,it was found that the reaction process of PODE3 did not generate olefins with carbon-carbon double bonds(C=C),which was the main reason that could effectively reduce soot emissions.Finally,through the "decoupling method",based on the diesel multi-component mechanism,the simplified sub-mechanism was combined to obtain a simplified mechanism of PODE3/diesel blended fuel containing 179 substances and 759 elementary reactions.Based on the sensitivity system of temperature sensitivity and stagnation period,the kinetic parameters of several reactions of the mechanism were adjusted to achieve the optimization goal.By using the different reaction modules of CHEMKIN-PRO software,the flame retardation period,laminar flame velocity,component concentration and HCCI engine were verified and analyzed.The results show that the results of the new simplified mechanism are consistent with the experimental values and the detailed mechanism.