Mechanism simplification and combustion characteristics verification of dimethyl ether combustion
As a fuel,dimethyl ether(DME)has the advantages of wide source,renewable and low carbon,and has become the most potential alternative fuel for internal combustion engine and gas turbine.However,the research on the combustion mechanism of DME is still insufficient.The skeleton mechanism(Mech_191)was obtained by simplifying the detailed mechanism of DME combustion under high pressure by using DRGEPSA method with error propagation and sensitivity analysis,and then the simplified mechanism was obtained by optimizing Mech_191 by adjusting the pre-exponential factor.The predicted values of the important parameters indicating DME combustion(ignition delay time and laminar flame velocity)obtained by the simplified mechanism were compared with those in the literature.The results show that the predicted values of the simplified mechanism are in good agreement with those in the literature,which verifies the effectiveness of the mechanism in simulating the combustion characteristics of DME.In addition,it is also found that the determination of some key reactions(such as the consumption reaction of·CH3OCH2)plays an important role in accurately obtaining important combustion parameters.
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