燃油添加剂改善HCCI发动机着火性能的试验研究

针对均质预混合压燃着火(HCCI)发动机低负荷易失火的问题,通过在参考燃料(90％的正庚烷和10％的异辛烷)和93号汽油中分别加入适量的着火改进剂过氧化苯甲酸淑丁脂,在HCCI发动机台架上进行燃烧试验．试验结果表明,在参考燃料中添加质量分数为0．3％-1．2％的过氧化苯甲酸叔丁脂后,与参考燃料相比,低负荷界限拓宽了15％-28％,而高负荷界限却降低了0．5％-7％,表明添加剂在拓宽低负荷的同时使高负荷范围下降．93号汽油添加适量的过氧化苯甲酸叔丁酯能够实现HCCI稳定燃烧,而未加添加剂的汽油则不能燃烧．

Experimental Study on the Improvement of Ignition Characteristics of a HCCI Engine by Fuel Additives

For the problem of misfire of the HCCI engine at low load, the engine test is carried out by mixing proper ignition improver (C6H5CO-O-O-C(CH3)3) with the reference fuel (90％iso-octane+10％ n-hep-tane) and the RON 93 gasoline respectively. After mixing C6H5CO-O-O-C(CH3)3 of 0.3％-1.2％ in mass fraction, compared with the reference fuel result, the engine operation range is enlarged by 15 ％ - 28 ％ at low load and reduced by0.5％-0.7％ at high load. It shows that additives can increase operational range of engine at low load, while decrease it at high load at the same time. When proper additive is mixed with RON 93 gasoline, stable HCCl combustion can be obtained, but the gasoline cannot burn without additives.