中文摘要：

在常压环境下对二甲醚的低温氧化特性做了实验研究,并在不同当量比下研究了预混气中甲醛的生成特性。实验结果表明,二甲醚在200℃左右开始缓慢发生氧化反应,在250～379℃时氧化反应最为剧烈,750℃时被完全氧化为CO_2和水;在二甲醚低温氧化产物中,甲醛是其重要的组分,二甲醚在200～400℃温度环境下最容易氧化而产生甲醛,且很难被分解。实际应用二甲醚作为替代燃料,应考虑尽量避开甲醛大量氧化产生的温度区间。

英文摘要：

The low temperature oxidation characteristics of DME and the behaviors of formaldehyde formation were investigated under the different equivalence ratio in normal pressure.The results show that the oxidation reactions of DME start at about 200℃.The most active reaction were taking place at about 250～379℃.It was completely oxidized at about 700℃.The results also show that the formaldehyde is one of the important low temperature oxidation products of DME.It was mass produced at 200～400℃and difficult to decompose.The temperature range which the formaldehyde was mass produced must be avoided when DME was used as alternative fuel in diesel engine.