用于柴油机的柴油-FAME混合燃料喷雾特性研究

Experimental Study on Spray Characteristics of Diesel-FAME Blends

研究了在不同的掺混比例、喷射压力和喷嘴孔径的条件下,柴油机的宏观喷雾参数的变化。结果表明:随着FAME含量的增加,喷雾穿透力增大,喷雾角减小,分子粘滞力增大,微滴尺寸增大,雾化效果变差;而随着喷射压力的增加,射流穿透力增大,喷射角减小;名气内容越多,名气率就越高;随着压力的增加,微观液滴尺寸减小;随着喷嘴直径的增大,液体的雾化变弱,穿透力增强,喷雾角减小,液滴尺寸变大,雾化变差。

Macro-spray structural parameters and micro-droplet of diesel-FAME under the circumstance of different FAME content,injection pressure and nozzle diameter were studied.With the increase of FAME content,the spray penetration increases;spray angle decreases;molecules viscous force and the micro-droplet size increase,which means the atomization gets worse.With increase of injection pressure,the penetration increases while the spray angle decreases.The more FAME content is,the greater the rate of them is.The microscopic droplet size decreases as pressure increasing.With increased nozzle diameter,the atomization of liquid becomes weak;the penetration extends and the spray angle decreases.Droplet size becomes bigger and atomization gets worse.