用加速量热仪研究参比燃料的低温氧化特性(Ⅰ)  

Oxidation Characteristics at Low Temperature for Primary Reference Fuels by Accelerating Rate Calorimeter (Ⅰ)

作　　者：吕兴才[1] 陈志[1] 乔信起[1] 黄震[1] 

机构地区：[1]上海交通大学内燃机研究所,上海200030

出　　处：《燃烧科学与技术》2004年第6期501-505,共5页Journal of Combustion Science and Technology

基　　金：国家"973"重点基础研究资助项目(2001CB209208);国家自然科学基金资助项目(50136040).

摘　　要：分析了两种参比燃料正庚烷和异辛烷氧化过程的化学动力学机理.在初始压力约1.5MPa和当量比为0.52左右的条件下,采用加速量热仪对两种基本参比燃料及其均匀燃/空混合物在450～650K之间的氧化特点进行了考察.实验结果表明两种参比燃料在450K时就有放热发生,并且随着自放热的发生正庚烷的压力逐渐升高,而异辛烷的压力在整个放热过程中基本保持不变,但当放热结束时却突然升高;正庚烷和异辛烷分别在598.5K和594.8K结束自放热,进入负温度系数区.HCCI combustion shows two-stage ignition phenomena, and the heat release and pressure rising rate at the first stage have a dominant effect on total ignition delay and burn rate for overall combustion. n-heptane and iso-octane are primary reference fuels (PRF) for octane rating in internal combustion engines. The oxidation mechanism of fuel plays a decisive role in ignition delay, burn rate, and engine knock-resistant. Based on these reasons, In this paper, the oxidation characteristics at low temperature ranging from (450 K～650 K) for n-heptane, iso-octane, and their mixture were investigated at the pressure of 1.5 MPa, and equivalence ratio of 0.52 by accelerating rate calorimeter (ARC). The experiment shows that the initial exothermic reaction can be detected at 450 K for pure primary reference fuels and the pressure increases with the self-heating reaction or with the growth of temperature for n-heptane, but it is worth noting that the pressure remains at a lower pressure range during the self-heating reaction for iso-octane. Furthermore, the self-rating reaction terminated respectively at 598.5 K and 594.8 K for n-heptane and iso-octane.

关 键 词：参比燃料 正庚烷 异辛烷 加速量热仪 氧化特性 化学动力学 

分 类 号：O657.3[理学—分析化学] TK401[理学—化学]