某六缸柴油机TCD燃烧系统优化匹配研究  

Optimization and Matching of TCD Combustion System for 6-Cylinder Diesel Engine

作　　者：路博阳 李向荣[1] 常江 赵伟华[1] 李全帅 LU Boyang;LI Xiangrong;CHANG Jiang;ZHAO Weihua;LI Quanshuai(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Hebei Huabei Diesel Engine Co.,Ltd.,Shijiazhuang 050081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]河北华北柴油机有限责任公司,河北石家庄050081

出　　处：《车用发动机》2024年第6期60-68,共9页Vehicle Engine

摘　　要：以一款六缸发电机组柴油机为研究对象,基于AVL Fire软件建立该六缸机TCD燃烧系统的三维仿真模型,利用试验结果对仿真模型进行验证。基于验证后的仿真模型,进行TCD燃烧室结构优化及油束夹角匹配。利用灵敏度分析法,以指示功率为评价指标,得出了燃烧室直径、下室出口直径等主要结构参数对TCD燃烧系统燃烧性能的影响程度,根据影响程度由大到小依次优化各参数,并在改变结构参数的同时进行油束夹角匹配。燃烧系统优化匹配后,单缸指示功率提高了0.79 kW,该六缸柴油机发电工况的燃烧性能得到提升。通过分析不同燃烧室结构参数下的缸内油气当量比分布,发现匹配最佳参数后,缸内空气利用率较高,当量比分布较均匀,油气混合较好,故TCD燃烧系统表现出更好的燃烧性能。A three-dimensional simulation model of the TCD combustion system of a six cylinder diesel engine for a generator set was established based on AVL Fire software,and the simulation model was validated by using experimental results.Then the optimization for the TCD geometries of combustion chamber and the matching of spray angle were conducted.By using sensitivity analysis method,the influence degree of main chamber geometries such as combustion chamber diameter and lower chamber outlet diameter on the combustion performance of TCD combustion system was obtained based on the evaluation index of indicated power.According to the influence degree,each geometry was optimized in descending order and the spray angle was matched simutaneously.Accordingly,the indicated power of single cylinder increased by 0.79 kW,and the combustion performance of the six cylinder diesel engine improved under power generation conditions.By analyzing the distribution of cylinder fuel/air equivalence ratio under different combustion chamber geometries,it was found that the cylinder air utilization rate improved,the distribution of equivalence ratio became more uniform,and the fuel/air mixed much better after matching the optimal parameters.Therefore,the TCD combustion system showed better combustion performance.

关 键 词：柴油机 燃烧室 参数优化 匹配 燃烧性能 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]