不同掺混比正丁醇/柴油喷雾特性的数值模拟  

Numerical simulation on spray characteristic of n-butanol/diesel fuel with different blending ratio

作　　者：李志越 王忠[1] 毛功平[1] 胡慧慧[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《中国农机化学报》2016年第3期144-149,共6页Journal of Chinese Agricultural Mechanization

基　　金：国家自然科学基金项目(51376083);江苏省高校自然科学基金重点项目(10KJA470009);江苏省2012年度普通高校研究生科研创新计划项目(CXZZ12_0676);江苏大学高级专业人才科研启动基金项目(12JDG040);江苏省2013年度普通高校研究生科研创新计划项目(CXZZ13_0672)

摘　　要：运用AVL FIRE软件建立的三维仿真计算模型。根据可视化的试验结果,验证模型准确性。利用该模型计算不同掺混比正丁醇/柴油混合燃料和柴油的喷雾贯穿距离和液滴的索特平均直径,分析不同掺混比对正丁醇/柴油混合燃料喷雾形态、气相速度场、浓度分布、蒸汽饱和度的影响。研究结果表明,随着正丁醇掺混比例的增加,混合燃料的喷雾贯穿距离略有降低,SMD下降,喷雾流场的速度降低,最高浓度降低,蒸汽饱和度上升。混合燃料密度、粘度、挥发性和表面张力等理化特性的差别是导致喷雾特性差异的主要原因。3D simulation model was established by using AVL FIRE software, and it was validated using the result of visual experiment. Spray penetration distance and sauter mean diameter of n-butanol/diesel fuel with different blending ratio and diesel were computed, the influence of different blending ratio on spray pattern, velocity of gas phase, concentration distribution and vapor saturation were analyzed. Results showed that, with increasing of the blending ratio of n-butanol, there was a slight reduction of spray penetration distance, sauter mean diameter was reduced, velocity of spray field was decreased, maximum concentration was reduced, meanwhile, vapor saturation was increased. The main reason resulting in difference of spray characteristic are due to the different physicochemical property parameters of blended fuel, such as density, viscosity, volatility, surface tension and so on

关 键 词：柴油 正丁醇 掺混比 喷雾特性 数值模拟 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]