高压共轨燃油喷射雾化特性的数值预报
来源期刊：中南大学学报(自然科学版)2012年第10期
论文作者：周乃君 杨晓力 邢志海 黄庆 刘慧
文章页码：4063 - 4067
关键词：高压共轨；燃油喷射；雾化特性；数值模拟
Key words：high pressure common rail; fuel injection; atomization characteristics; numerical simulation
摘 要：利用FLUENT软件，采用WAVE破碎及标准k-ε湍流模型，对高压燃油喷射雾化过程进行数值模拟研究；在可视化实验平台上，借助高速摄影技术，结合C#语言开发的图像处理软件，分析得出宏观喷雾特性。采用数值模拟方法获得了各种工况下的喷雾贯穿距和锥角等宏观特性的发展规律。研究结果表明：仿真结果与试验结果较吻合。喷射压力越大，喷雾贯穿距越大，喷雾锥角越小；背压越大，喷雾贯穿距越小，喷雾锥角越大；随着喷射时间的增加，单位时间内贯穿距离和喷雾锥角的增加幅度都呈逐渐减小的趋势。
Abstract: With WAVE breakup model as well as standard k-ε turbulence model，numerical simulation for spray characteristics was established by FLUENT on high pressure common rail fuel injection system. With the visualization of experimental platform, many spray process images were obtained using a high speed camera. Processing these images through C# procedure, macro-spray characteristics under different conditions were obtained, and then the development of spray characteristics was achieved by numerical simulation under various conditions, including spray penetration and spray cone angle. The results show that numerical simulation model is reliable and can be well verified by experiment data. With the increase of injection pressure, the spray penetration increases and the spray cone angle decreases; with the increase of gas pressure in the cylinder, the spray penetration decreases and the spray cone angle increases. With the increase of injection time, the rate of spray penetration and spray cone angle are gradually decreased.
周乃君，杨晓力，邢志海，黄庆，刘慧
(中南大学 能源科学与工程学院，湖南 长沙，410083)
摘 要：利用FLUENT软件，采用WAVE破碎及标准k-ε湍流模型，对高压燃油喷射雾化过程进行数值模拟研究；在可视化实验平台上，借助高速摄影技术，结合C#语言开发的图像处理软件，分析得出宏观喷雾特性。采用数值模拟方法获得了各种工况下的喷雾贯穿距和锥角等宏观特性的发展规律。研究结果表明：仿真结果与试验结果较吻合。喷射压力越大，喷雾贯穿距越大，喷雾锥角越小；背压越大，喷雾贯穿距越小，喷雾锥角越大；随着喷射时间的增加，单位时间内贯穿距离和喷雾锥角的增加幅度都呈逐渐减小的趋势。
关键词：高压共轨；燃油喷射；雾化特性；数值模拟
ZHOU Nai-jun, YANG Xiao-li, XING Zhi-hai, HUANG Qing, LIU Hui
(School of Energy Science and Engineering, Central South University, Changsha 410083, China)
Abstract:With WAVE breakup model as well as standard k-ε turbulence model，numerical simulation for spray characteristics was established by FLUENT on high pressure common rail fuel injection system. With the visualization of experimental platform, many spray process images were obtained using a high speed camera. Processing these images through C# procedure, macro-spray characteristics under different conditions were obtained, and then the development of spray characteristics was achieved by numerical simulation under various conditions, including spray penetration and spray cone angle. The results show that numerical simulation model is reliable and can be well verified by experiment data. With the increase of injection pressure, the spray penetration increases and the spray cone angle decreases; with the increase of gas pressure in the cylinder, the spray penetration decreases and the spray cone angle increases. With the increase of injection time, the rate of spray penetration and spray cone angle are gradually decreased.
Key words:high pressure common rail; fuel injection; atomization characteristics; numerical simulation
