摘要
根据柴油机喷束所具有的特点,设计了一种基于喷束壁面引导、分层理论和空间分散思想的"双壁面射流"燃烧系统。该系统具有低压缩比、单峰放热率的特性。通过试验研究了"双壁面射流"柴油机的燃烧特性与排放性能。试验结果表明:采用低压缩比的"双壁面射流"柴油机缸压峰值低于原机,燃烧始点向后推迟,滞燃期增加。在相同的喷射定时条件下,"双壁面射流"柴油机放热率重心向后推迟,即燃烧相位向后推迟3～4°CA,但是在θ0～θ70燃烧阶段具有较高的燃烧速率;在保持发动机动力性不变的情况下,"双壁面射流"燃烧系统2 100r/min全负荷时NOx排放从原机的731×10-6降低到523×10-6,在3 000r/min全负荷时NOx排放从原机的523×10-6降低到383×10-6;"双壁面射流"燃烧系统降低了低速烟度,在1 400r/min全负荷时烟度从原机的3.3BSU降低到2.1BSU,中、高速由于碳烟在燃烧后期的氧化能力受到抑制,烟度略有增加。
According to diesel spray characteristics,a double wall jet combustion system featuring low compressor ratio and single peak heat release was designed based on stratification and space-dispersed ideals and wall-guiding way.The combustion process and emission characteristics were experimentally investigated.Results show that peak pressure of the double wall jet system with lower compressor ratio is lower than original engine,ignition timing lags,and ignition delay increases.At the same injection pressure,heat release rate center of double wall jet system lags,i.e.combustion phase delays 3~4°CA,combustion rate at range of θ0~θ70 is higher.While keeping the same power output as original engine,the double wall jet system has lower NOx emissions.It reduces from 731×10-6 to 523×10-6 at full load 2100r/min,and from 523×10-6 to 383×10-6 at full load 3000r/min.The smoke at low speed range reduces from 3.3BSU to 2.1BSU at full load 1400r/min.In middle and high speed ranges,the smoke increases slightly in later combustion period because of its restrained oxidation ability.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2011年第5期23-30,共8页
Chinese Internal Combustion Engine Engineering
关键词
内燃机
柴油机
双壁面射流
空间分散
燃烧
NOx
IC engine
diesel engine
double wall jet
space-dispersed
combustion
NOx
作者简介
郭鹏江（1977-）。男．博士生，主要研究方向为内燃机排放控制，内燃机混合气的形成、喷雾与燃烧技术．E-nmil：guopengjiang@sina．com
