Combustion Kinetic Modeling and Experimental Study of Polyoxymethylene Dimethyl Ethers-2(PODE2)
The combustion characteristics of polyoxymethylene dimethyl ethers-2(PODE2)at medium and low temperatures were investigated by kinetic modeling and experimental study.Following the rection class-based rate rules,a detailed reaction mechanism for PODE2 was constructed according to the detailed mechanism of dimethoxymethane(DMM).The PODE2 kinetic mechanism was validated against available literature experimental data.Ignition delay time of PODE2 was measured in a rapid compression machine(RCM)platform in the temperature range of 650～900 K and at the equivalence ratios of 0.5、1.0、2.0.The controlling factors of PODE2 auto-ignition process at medium and low temperatures were analyzed in conjunction with the constructed detailed mechanism.The results show that the constructed PODE2 reaction mechanism can well reproduce the experimentally measured ignition delay time.The PODE2 auto-ignition shows a clear two-stage ignition phenomenon and does not exhibit any negative temperature coefficient(NTC)behaviors.The first-stage ignition delay time of PODE2 varies linearly with temperature in the low temperature range,and shows a plateaus in the mid-temperature range of 720～820 K.The low temperature reactivity of PODE2 is derived from three alternative channels,and the typical low temperature chain branching reaction sequence initiated by the oxygen addition reaction is inhibited.
polyoxymethylene dimethyl ethers(PODE)chemical reaction kineticsrapid compression machinecombustion kinetic model
万方数据
维普
