CAJ | 학술논문

为研究燃用生物柴油发动机排放颗粒的微观特性，在一台电控高压共轨柴油机上进行试验。发动机在转速2000r／min、扭矩225Nm的工况稳定运转时，燃用不同掺混比例的黄连木籽生物柴油-柴油。利用高分辨率透射电镜（HRTEM），按照Brasil算法，计算排放颗粒的分形维数。结果表明：生物柴油体积掺混比为0、10％和50％的3种燃料的颗粒由粒径为26．56N28．61nm球形原始粒子构成，具有分形特性；而生物柴油掺混比为100％时，原始粒子直径为45．57nm，与其余3种燃料相差较大。随掺混比例的增加，分形维数逐渐增加，结构逐渐紧凑；原始粒子的层面间距逐渐减小，氧化活性逐渐降低。
위연구연용생물시유발동궤배방과립적미관특성，재일태전공고압공궤시유궤상진행시험。발동궤재전속2000r／min、뉴구225Nm적공황은정운전시，연용불동참혼비례적황련목자생물시유-시유。이용고분변솔투사전경（HRTEM），안조Brasil산법，계산배방과립적분형유수。결과표명：생물시유체적참혼비위0、10％화50％적3충연료적과립유립경위26．56N28．61nm구형원시입자구성，구유분형특성；이생물시유참혼비위100％시，원시입자직경위45．57nm，여기여3충연료상차교대。수참혼비례적증가，분형유수축점증가，결구축점긴주；원시입자적층면간거축점감소，양화활성축점강저。
Tests were carried out in an electric controlled high pressure common rail diesel engine to research on microscopic characteristics of particle emitted from a diesel engine fueled with biodiesel. A diesel engine fueled with different proportions of biodiesel/diesel blends was operated stably at 2 000 r/rain and 225 N.m. The fractal dimension of the particles emission was calculated according to the Brasil algorithm using high-resolution transmission electron microscope （HRTEM）. The results show that spherical primary particles of which mean diameter ranged between 26.56 nm and 28.61 nm consist of the particles exhibiting characteristics of fractal structure generated by the combustion of the fuels with biodiesel volume fraction of 0%, 10% and 50%. Mean diameter of primary particles for fuel with volume fraction of biodiesel of 100% is 45.57 nm, which is quite different from the other three kinds of fuels. With increasing percentage of Pistaciachinensis Bunge seed biodiesel, fractal dimension increases gradually and primary particles become more close while mean fringe separation distances decrease and the oxidation activities become lower.