甲醇掺混比对甲醇/生物柴油混合燃料燃烧循环变动的影响  

Influence of methanol mixture ratio on combustion cyclic variation of methanol/biodiesel blend

作　　者：陈培红[1,2] 王忠 杨丹[2] 夏骅[2] 李瑞娜 Chen Peihong;Wang Zhong;Yang Dan;Xia hua;Li Ruina(Department of Marine Engineering,Nantong Vocational&Technical Shipping College,Nantong 226010,China;School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]南通航运职业技术学院轮机工程系,江苏南通226010 [2]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《可再生能源》2019年第12期1757-1763,共7页Renewable Energy Resources

基　　金：国家自然科学基金项目（51776089）;江苏省研究生创新计划项目（KYCX17-1777）

摘　　要：文章在186FA柴油机上,开展了柴油机燃用甲醇/生物柴油不同掺混比混合燃料的燃烧过程试验,测量了柴油机示功图,分析了燃烧过程特征参数对循环变动的影响,讨论了滞燃期循环变动系数(COVT)、燃烧持续期循环变动系数(COVD)及放热规律型心循环变动系数(COVCA50)随甲醇掺混比的变化规律,提出了评价单缸柴油机循环变动系数的临界值。研究结果表明:当柴油机供油量一定时,COVT,COVD和COVCA50均随着甲醇掺混比的增加而增加;当甲醇掺混比为30%时,COVT,COVD和COVCA50分别为2.76%,6.77%和14.4%,与甲醇掺混比为20%时相比,循环变动系数均有明显增加,最大增幅为48%。考虑到柴油机较低燃烧循环变动系数与工作稳定性的要求,对于应用甲醇/生物柴油混合燃料的柴油机,甲醇的掺混比不宜高于20%。The combustion process test of 186 FA diesel engine fueled with methanol/biodiesel blend fuel with different mixing ratio was carried out. The indicator diagram of diesel engine was measured, and the effects of combustion characteristic parameters on cyclic variation were analyzed. The variation rule of cyclic variation coefficient of ignition delay(COVT), the cyclic variation coefficient of the combustion duration(COVD) and the cyclic variation coefficient of centroid of heat release rate(COVCA50) with methanol mixing ratio were discussed. Then, a critical value for evaluating the cyclic variation coefficient of a single cylinder diesel engine was put forward. The results showed that, when the fuel supply of the diesel engine was not changed,COVT, COVDand COVCA50 were increased with the increase of methanol mixture ratio. When the methanol mixing ratio was 30%, COVT, COVDand COVCA50 were 2.76%, 6.77% and 14.4%,respectively. Compared with the blend that 20% methanol mixed in, the cyclic variation coefficient was increased obviously, with the maximum increase of 48%. Considering the lower combustion cyclic variation coefficient and the working stability requirements of diesel engine, the methanol mixing ratio of methanol/biodiesel blend used in diesel engine should not be higher than 20%.

关 键 词：生物柴油 甲醇 掺混比 滞燃期 燃烧持续期 放热率型心 循环变动系数 

分 类 号：TK428.9[动力工程及工程热物理—动力机械及工程]