甲醇/柴油双燃料发动机燃烧过程分析  

Combustion process analysis of methanol/diesel dual fuel engine

作　　者：王忠[1] 李仁春[1] 张登攀[1] 李铭迪[1] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013

出　　处：《农业工程学报》2013年第8期78-83,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(50776042);江苏省高校自然科学基金重点项目(10KJA470009;08KJA470001);江苏省2012年度普通高校研究生科研创新计划项目(CXZZ12_0676);江苏高校优势学科建设工程资助项目(PAPD);江苏大学高级专业人才科研启动基金项目(12JDG040)

摘　　要：为了防止某些工况下爆震的发生,该文在不改变4B26增压柴油机结构的前提下,采用进气甲醇电控喷射,实现甲醇/柴油双燃料燃烧,分析了进气预混掺烧甲醇/柴油双燃料发动机的燃烧过程。试验结果表明,低负荷时随着甲醇掺烧比例的增大,最大爆发压力、缸内平均温度和放热率峰值略有降低,燃烧始点推迟,燃烧持续期变化不明显;高负荷时,随着甲醇掺烧比例的增大,滞燃期缩短,燃烧终点提前,定容放热比例增大,最大爆发压力和放热率峰值明显增加,缸内平均温度略有升高;与燃烧柴油相比,在最大扭矩转速、80%负荷时,掺烧50%甲醇的最大爆发压力增加了12.1%,放热率峰值增加了37.7%。研究结果确定了不同负荷的甲醇掺烧比例变化范围,为甲醇喷射控制策略的优化提供了依据。In recent years, environment concerns and depletion in petroleum resources have forced researchers to concentrate on exploiting renewable alternatives fuels. As a renewable and alternative fuel, methanol has gained great attendance. As for the application of methanol on compression ignition engines, researchers have focused on partial replacement of diesel with methanol, either blended with diesel or injected into the air intake. Due to the poor miscibility of diesel and methanol, an additive has to be added to form steady methanol/diesel blends. However, majority of these additives have bad influence on NO X emission. Methanol and diesel can also be applied separately to the engine. Dual injection system is one method, which is difficult and expensive to develop. Compared with other methods, intake premixed methanol is more flexible in operation and has greater potential to applied to practical application. In this paper, the methanol injection system was optimally designed according to the former investigation on air-methanol mixture formation inside internal combustion engine. However, previous research results showed that severe knock would happen at high load with high proportion of methanol. In addition, the intake charge temperature declined, owing to the high level of methanol vaporization latent heat. Thirdly, with the addition of methanol, high temperature and low temperature exothermic reaction were delayed, and the ignition delay of dual fuel was prolonged. The premixed methanol injection was controlled by intake manifold electrically system, and the combustion process of methanol/diesel dual fuel was experimentally investigated. Based on the experimental results, the optimization and application of methanol injection system were proposed, and make sure that the output power of optimized dual engine hardly changed. The experimental research was carried out on 4B26 turbocharged diesel engine. The tests were conducted at four different methanol proportion （0, 30%, 40%, and 50%） by changing the metha

关 键 词：柴油机 代用燃料 燃烧 甲醇 预混 

分 类 号：TQ464[化学工程—制药化工]