摘要
以一台高压共轨、增压中冷的重型柴油机为研究对象,研究了不同加载率、加载起始点以及加载持续时间对恒转速增转矩加载过程的影响.定义了"平均增量空燃比"和"空燃比平均减速度"两个参数,分别用于评价加载过程中供气相对于供油的响应速率和空燃比的降低速率.研究发现:加载率越大或者加载起始点负荷越小,供气滞后越严重,燃油消耗率、烟度以及CO排放增加,但NOx排放降低.燃油消耗率和烟度排放的主要恶化区分别集中在加载过程的前期和后期;随着加载持续时间增大,供气响应性能虽有改善,但空燃比较稳态值仍明显降低,燃油消耗率、烟度和CO排放性能恶化.另外,加载持续时间对瞬态烟度和CO峰值排放存在拐点.
Effects of loading rates,initial loads and loading times on turbocharged heavy-duty diesel engine under transient operating condition with constant speed and increasing torque were experimentally investigated.The parameters of ＂average increment ratio of air and fuel＂ and ＂average deceleration of α,＂ are proposed to evaluate the airsupply response performance and α reduction rate,respectively.Results show that brake specific fuel consumption（BSFC）,smoke,CO and air-supply delay are increased while NOxemission is decreased when the loading rate is increased or initial load is decreased.Deterioration of BSFC and smoke are light and heavy load areas respectively.With the increase of loading time,air-supply response is improved,but fuel economy and emissions of smoke and CO are deteriorated.However,there exists a shift in peak values of smoke and CO emission with loading time.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2016年第1期16-24,共9页
Transactions of Csice
基金
国家重大基础研究发展规划(973)资助项目(2013CB228402)
国家自然科学基金资助项目(51206060)
吉林大学研究生创新基金资助项目(2014015)
关键词
增压柴油机
瞬态工况
平均增量空燃比
加载
turbocharged diesel engine
transient operation
average increment ratio of air and fuel
loading
