Combined experimental and kinetic modeling study on the low-temperature oxidation of OME3/n-heptane blends

Experimental and kinetic studies on the blending of ethers or diesters with larger alkanes at low temperatures are enormously scarce. In this paper, the low-temperature oxidation (LTO) kinetics model of polyoxymethylene dimethyl ether 3 (OME 3 )/ n -heptane (500 K–950 K) was established by using the jet-stirred reactor (JSR) to conduct the LTO experiments of OME 3 / n -heptane with different blending ratios. GC/MS was used to detect and quantify 17 kinds of stable products in the LTO process of OME 3 / n -heptane. The detailed OME 3 / n -heptane kinetic model was fully verified experimentally. The interaction mechanism of OME 3 / n -heptane was discussed based on the experiments and corresponding chemical kinetic analysis . Results show that the oxidative decomposition processes of OME 3 and n -heptane were significantly different, the LTO and NTC process of OME 3 were significantly weaker than those of n -heptane, but the high-temperature reactivity of OME 3 was much stronger. In addition, n -heptane significantly promoted the intermediate species CH 3 OCHO and COCOC*O of OME 3 , mainly because n -heptane significantly prolonged the LTO of OME 3 in the fuel blends. And the NTC process of the fuel blends was mainly dominated by OME 3 , while the LTO process was more influenced by n -heptane, which resulted in the weakened NTC of n -heptane and the significantly enhanced LTO process of OME 3 .