| 柴油机双卷流燃烧室内外室燃油匹配分析 |
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| 引用本文： | 李向荣,周海琴,万远亮,苏立旺,刘福水.柴油机双卷流燃烧室内外室燃油匹配分析[J].农业工程学报,2016,32(20):70-76. |
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| 作者姓名： | 李向荣 周海琴 万远亮 苏立旺 刘福水 |
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| 作者单位： | 1. 北京理工大学机械与车辆工程学院,北京,100081;2. 东风商用车有限公司技术中心公司,武汉,430056;3. 中国北方发动机研究所,天津,300400 |
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| 基金项目： | 装备预研项目（104010204） |
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| 摘 要： | 为了分析双卷流燃烧室内室燃油质量分数对发动机性能的影响,研究了双卷流燃烧室最佳的内室燃油质量分数范围。首先利用AVL Fire软件仿真计算不同油束夹角下双卷流燃烧室内室燃油质量分数变化,分析内室燃油质量分数变化对发动机的动力性和排放性能的影响,发现内室燃油质量分数约为10%~20%时,发动机指示功率较高,碳烟排放较低。然后总结归纳了内室燃油质量分数随喷油提前角和转速变化的规律。转速增大,内室燃油质量分数减小;喷油提前角增大,内室燃油质量分数增大。研究表明转速提高时,适当增加喷油提前角可以保证内室燃油质量分数处于较优值,使柴油机取得较佳性能。该研究可为双卷流燃烧系统的燃油匹配提供参考。
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| 关 键 词： | 柴油机 燃油 匹配 双卷流燃烧室 内室燃油质量分数 排放 |
| 收稿时间： | 7/8/2015 12:00:00 AM |
| 修稿时间： | 2016/7/22 0:00:00 |
Matching analysis of fuel in inner chamber and outer chamber of double swirl combustion system in diesel engine |
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| Li Xiangrong,Zhou Haiqin,Wan Yuanliang,Su Liwang and Liu Fushui.Matching analysis of fuel in inner chamber and outer chamber of double swirl combustion system in diesel engine[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(20):70-76. |
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| Authors: | Li Xiangrong Zhou Haiqin Wan Yuanliang Su Liwang and Liu Fushui |
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| Institution: | 1. School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China,1. School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China,2. Technology Center of DongFeng Commercial Vehicle Company Limited, Wuhan 430056, China,3. China North Engine Research Institute , Tianjin 300400, China and 1. School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | Direct injection (DI) diesel engines are used in the field of transportation and engineering machinery due to their excellent thermal efficiency and practical economic value. In order to reduce air pollution, diesel engines are continuously forced to improve the combustion processes, especially to reduce emitted particulate matter (PM) and nitrogen oxidants (NOx). Fuel-air mixing and fuel-air distribution play a vital role to reduce harmful emissions. Therefore, a homogeneous fuel/air mixture in the combustion chamber and an increase of the fuel/air mixture area can significantly improve the utilization of air and restrict the soot formation in diesel engines. Double swirl combustion system (DSCS) has excellent thermal efficiency in practical application, but its mass fraction of fuel in inner chamber has not been studied yet. It is hypothesized that mass fraction of the fuel in inner chamber is 10%. To verify the hypothesis, the best range of mass fraction in inner chamber and the effect of dynamic performance and the emission were researched in present paper. First, we analyzed the changes of mass fraction of fuel in inner chamber under different spray angles. Spray angle was conducted at 140°, 145°, 150°, 155° and 160°, and at this time, the injection advance angle was 12° and the speed was 2 500 r/min. Meanwhile, the power characteristics and emission characteristics were analyzed with CFD (computational fluid dynamics) simulation. We researched the soot and NOx at different spray angles. We then analyzed the effect of injection advance angles on the mass fraction of fuel in inner chamber. Injection advance angle was conducted at 10° (corresponding to crank angle of 350°), 12°, 14°, 16°, 18° and 20°, and at this time, the spray angle was 145° and the speed was 2 500 r/min. Meanwhile, the mass fraction of fuel on TDC (top dead center) in inner chamber and mass fractions of NOx and soot were analyzed. We also researched the soot and NOx at different injection advance angles. The engine speeds (1 300, 1 600, 1 900, 2 200, 2 500 and 2 800 r/min) were selected to study its effect on mass fraction of fuel in inner chamber. The mass fraction of fuel on TDC in inner chamber and emission characteristics were also analyzed. At last we analyzed the combined influences of injection advance angle and speed. The result showed that the indicated power and NOx were the highest, and the soot formation was the lowest, when the mass fraction of the fuel in inner chamber was about 10%-20%. The reason could be explained as follows: the fuel/air mixing quality was improved when the mass fraction of the fuel in inner chamber was about 10%-20%. Thus, it can be concluded that about 10%-20% mass fraction of the fuel in inner chamber has a positive influence on improving the utilization of the air inside the cylinder. The air in DSCS is made full use of, thus making the cylinder have an increase in the fuel mixing and burning. With the increase of the fuel injection advance angle, the mass fraction of fuel in inner chamber increased. Soot emissions increased at first and then decreased with the increase of injection advance time, and NOx emissions decreased with injection advance time. With the increase of the speed, the mass fraction of fuel in inner chamber decreased, soot increased and NOx decreased. At last, we researched the comprehensive effect of injection advance angle and speed on the mass fraction of fuel in inner chamber. The result showed that when the speed increased, we could keep the fuel in inner chamber in about 10%-20% by increasing the fuel injection advance angle, which meant the optimal mass fraction of the fuel in inner chamber could be ensured when increasing speed and injection advance angle. |
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| Keywords: | diesel engines fuels distribution double swirl chamber mass fraction of fuel in inner chamber emission |
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