生物柴油可压缩性计算及其对燃烧与排放的影响  

Compressibility Calculation of Bio-diesel and Its Influence on Combustion and Emission

作　　者：陈昊[1,2] 杨璐[1] 李江[1] 李阳阳[1,2] 耿莉敏[1] 

机构地区：[1]长安大学汽车学院,陕西西安710064 [2]长安大学陕西省交通新能源开发、应用与汽车节能重点实验室,陕西西安710064

出　　处：《中国公路学报》2014年第3期116-121,共6页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51078357);中央高校基本科研业务费专项资金项目(2013G1221018,CHD2012JC049)

摘　　要：为了研究生物柴油可压缩性对单缸柴油机燃烧与排放的影响,在不同燃油温度与压力条件下,计算生物柴油的密度、声速、弹性模量与可压缩性;采用台架试验手段研究不同生物柴油可压缩性对柴油机燃烧与排放的影响,对燃烧压力、放热率、排放(HC,CO,NOx,碳烟)进行对比分析。研究结果表明:温度增加导致生物柴油密度、声速、弹性模量降低,可压缩性增强;生物柴油可压缩性的增强导致燃烧滞后,且峰值燃烧压力及峰值放热率降低;1 500r·min-1转速下,与0.49GPa-1相比,0.53,0.57,0.64GPa-1下的CO排放分别平均增加5.6%,36.1%和41.7%,HC排放分别平均增加12.2%,30.1%和70.3%,碳烟排放分别平均增加54.2%,100.0%和125.0%,NOx排放分别平均降低6.1%,13.0%和23.2%;可压缩性对生物柴油燃烧与排放规律的影响显著。In order to study the influence of compressibility on combustion and emission of single cylinder diesel engine fueled with bio-diesel, under different temperatures and pressure conditions, the density, sound velocity, modulus of elasticity and compressibility of bio-diesel were calculated. Bench test method was used to study the influence of bio-diesel compressibility on combustion and emission of diesel engine. The combustion pressure, the instantaneous heat release rate, and HC, CO, NOx and smoke emission were analyzed through comparison. The results show that the increase of temperature leads to the decrease of bio-diesel density, sound velocity and modulus of elasticity but the enhancement of compressibility. Enhancement of compressibility causes the lag of combustion, and the decrease of peak combustion pressure and peak heat release rate. At 1 500 r ·min^-1 , compared with 0.49 GPa-1 , CO emission at 0.53, 0.57 and 0. 64 GPa-1 increases by an average of 5. 6%, 36. 1% and 41. 7% respectively, HC emission by 12.2%, 30.1% and 70.3%, smoke emission by 54.2%, 100.0% and 125.0%, but NOx emission decreases by an average of 6. 1%, 13% and 23.2%. Compressibility significantly influences the combustion and emission characteristics o{ bio-diesel.

关 键 词：汽车工程 生物柴油 台架试验 可压缩性 排放 

分 类 号：U473.1[机械工程—车辆工程]