应用正交设计法优化大功率柴油机燃烧系统的多维仿真研究

Multi-Dimensional Simulation of Combustion System Optimization for a High Power Diesel Engine by Using Orthogonal Design Method

应用正交设计法对大功率柴油机燃烧系统参数进行了多维仿真优化研究,综合考虑了柴油机的进气系统、喷油系统和燃烧室形状等参数,并通过方差分析得出了单因素和交互作用对柴油机动力性的影响规律。研究结果表明:正交设计法可以用于大功率柴油机燃烧系统优化匹配的多维仿真研究,使柴油机的动力性大幅度提高;从燃烧室廓形中提取出的3个参数(喉口半径、锥台角度和凹坑半径)可以作为燃烧室设计的特征参数;以动力性为优化目标时,喷孔数与涡流比的交互作用影响最大,涡流比、油束夹角与锥台角度的交互作用,喷油压力与喉口半径的交互作用的影响次之,喷孔数有一定的影响;最后得出各种交互作用的匹配关系及其对柴油机动力性的影响。

Multi-dimensional simulation of combustion system optimization in a high power diesel engine was investigated by orthogonal design method. Comprehensively considered a number of parameters of intake system, fuel injection system and combustion chamber shape, their influences on engine power characteristics in forms of single factor and interaction were studied using variance analysis. The results show that the orthogonal design method can be applied to multi-dimensional simulation study of optimization matching of combustion system for high power diesel engine to improve its power characteristics. The factors, throat radius, frustum angle and combustion bowl radius may be used as the feature parameters in combustion chamber design. When taking engine power characteristics as simulation objective, the interaction of nozzle hole number with intake swirl ratio is of the greatest influence, that of intake swirl ratio and spray angle with frustum angle, injection pressure with throat radius in the middle, the interaction of nozzle hole number the least. Matching relationships of various interactions and their effects on engine power characteristics were obtained.