论文部分内容阅读
采用高分辨率数码照相机对柴油与柴油—生物柴油混合燃料喷雾特性进行了对比研究。结果表明,随着生物柴油掺混比的增大,燃料黏度增大,喷雾锥角变小,Sauter平均直径增大。与MB24相比,柴油的相对尺寸范围和发散边界较大,因此其Sauter平均直径比MB24混合燃料的略大。由于乙醇的稀释作用,改制油MB24的Sauter平均直径最小,雾化质量明显改善。从喷雾液滴尺寸的数目分布可以看出,所有燃料的曲线峰值均位于14μm处,小颗粒液滴较多。随着生物柴油掺混比的增大,曲线峰值下降,下降趋势均匀平缓,说明燃料黏度的增大将使雾化油滴的尺寸分布渐趋均匀。从液滴尺寸的累积体积分布可以看出,随着生物柴油掺混比的增大,达到某一累积体积的油滴直径增大,说明大颗粒油滴增多。
A high-resolution digital camera was used to compare the spray characteristics of diesel and diesel-biodiesel blends. The results show that with the increase of the blending ratio of biodiesel, the viscosity of fuel increases, the cone angle decreases, and the average Sauter diameter increases. Diesel has a larger Sauter mean diameter and slightly larger diverging boundary than MB24 compared to MB24. Due to the dilution effect of ethanol, Sauter MB24 modified oil minimum average diameter, atomization quality improved significantly. As can be seen from the number distribution of spray droplet size, all fuel peak curves are located at 14μm, with smaller droplets. With the increase of the blending ratio of biodiesel, the peak value of the curve decreased and the descending trend was even and flat, which indicated that the increase of the viscosity of the fuel would make the size distribution of the atomized oil droplets gradually become uniform. From the cumulative volume distribution of droplet size, it can be seen that as the blending ratio of biodiesel increases, the diameter of a droplet that reaches a certain cumulative volume increases, indicating that large particle oil droplets increase.