摘要
在一台直喷式增压柴油机上进行了生物柴油、柴油及其掺混油B20、B50的性能试验,通过测量喷油器针阀升程、喷油压力和气缸压力曲线,对放热率、滞燃期等燃烧特性参数进行了分析,以研究生物柴油对发动机燃烧性能的影响。试验结果表明,在相同工况下,随着掺混油中生物柴油比例的增加,喷油始点逐渐提前,喷油延迟角逐渐变大,喷油压力和喷油持续期有所增加;滞燃期逐渐缩短,在大负荷尤为明显;预混合放热峰值逐渐降低,而扩散燃烧放热峰值逐渐增大;缸内最高燃烧压力提高,其对应的曲轴转角也逐渐提前。燃用生物柴油后发动机的热效率有所提高,在中等负荷时尤为明显。
A turbocharged, direct injection diesel engine fueled with biodiesel and diesel was used to conduct performance tests. In order to investigate the effect of biodiesel on combustion characteristics, the injector needle lifts, injection pressure and gas pressure in cylinder were recorded and some parameters of combustion were analyzed, such as heat release rate, ignition delay. The results indicate that with increase of biodiesel addition, start of injection is advanced and injection delay increases; injection pressure and injection duration increases little; ignition delay is shortened gradually, especially on heavy load; the peak value of premixed burning rate decreases while the maximum diffusive burning rate increases; maximum cylinder gas pressure is improved and its corresponding crank angle is advanced. In addition, with biodiesel the effective thermal efficiency of engine increases, which is greatest on middle load.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2007年第6期7-10,15,共5页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金资助项目(50576003)
关键词
内燃机
生物柴油
直喷式柴油机
燃烧
代用燃料
IC engine
biodiesel
direct injection diesel engine
combustion
alternative fuel
