高原环境下喷孔直径对不同掺混比生物柴油燃烧与排放的影响  

Effects of Nozzle Diameter on Combustion and Emission Characteristics of Different Blending Ratios of Biodiesel under Plateau Environment

作　　者：沈颖刚[1] 李伟东[1] 陈贵升[1] 陈朝辉[1] 

机构地区：[1]昆明理工大学云南省内燃机重点实验室,昆明650500

出　　处：《内燃机工程》2016年第4期76-83,共8页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51366007);云南省应用基础研究基金面上项目(2013FB017;2013FB019)

摘　　要：以高原高压共轨柴油机为研究机型,根据台架试验和发动机结构参数,运用AVL Fire构建其三维计算流体动力学(computational fluid dynamics,CFD)计算模型并进行模型验证。在海拔1 890m高原大气环境下,对B0、B10和B100三种燃料发动机采用0.10mm、0.15mm和0.20mm孔径直径喷油器时的燃烧过程与排放特性进行仿真模拟对比研究。计算结果表明:对于三种燃料,随着喷孔直径减小,燃烧始点提前,燃油消耗速率与累计放热率升高,缸内燃烧温度和OH活性基浓度增大,燃空当量比降低,NO排放增加,碳烟和CO排放则减小;随着喷孔直径增大,B100的燃烧消耗速率低于B0;采用相同喷孔直径时,NO随着生物柴油掺混比增大总体升高,B100的碳烟和CO排放明显低于B0,而B10的碳烟随着喷孔直径增大稍高于B0。By using AVL Fire software, the CFD calculation model of common-rail diesel engine was established based on the bench test and structural parameters of the test engine. The comparative test was carried out at an altitude of 1890 meters and with three different nozzle valve diameters of 0.10 ram, 0.15 mm and 0.20 mm respectively. The results show that：for three fuels of B0, B10 and B100, with the decrease of nozzle valve diameter, the combustion start timing will advance, together with the increase of accumulated heat release and fuel consumption rate. Also, the combustion temperature, OH radical and NO emission will increase, together with the decrease of fuel-air equivalence ratio and soot. With the increase of nozzle valve diameter, the fuel consumption rate for B100 operation is lower than that for B0 operation. When using the same nozzle valve diameter, NO emission will rise with the increase of biodiesel blending ratio, and the soot and CO emissions for B100 operation are lower than those for B0 operation. However, the soot for B10 operation will be a little higher than that for B0 operation with the increase of nozzle valve diameter.

关 键 词：内燃机 高原环境 喷孔直径 生物柴油 燃烧特性 排放 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]