网格尺寸与湍流模型对柴油机燃烧模拟的影响  

The Effect of Mesh Size and Turbulence Model on Diesel Combustion Simulation

作　　者：张克松[1] 韩广德[1] 李晶玮[1] 富文军[1] 庞守美[1] 

机构地区：[1]山东交通学院汽车工程学院,山东济南250357

出　　处：《山东交通学院学报》2016年第3期1-6,11,共7页Journal of Shandong Jiaotong University

基　　金：山东省自然科学基金资助项目(ZR2014EEQ015)

摘　　要：以某小型高速柴油机为例,建立不同网络尺寸的燃烧室数值模型,应用化学反应动力学燃烧模型,对比研究不同网格尺寸对燃烧模拟的影响,并利用中等网格尺寸的燃烧室模型研究标准k-ε、ζ-f、RSM-SSG 3种湍流模型对燃烧计算的影响。研究发现:网格尺寸和湍流模型对燃烧中的宏观参数影响不明显。3种网格尺寸模型计算得到的CO和C_2H_4的空间分布在微观上存在明显差别,网格越精细,不完全燃烧产物在油束前锋的火焰中心处越集中;3种湍流模型计算得到的CO和C_2H_4的空间分布形态相似,但浓度的时空分布存在一定差别。Taking a small-sized diesel engine with high speed as an example,numerical models of combustion with different mesh sizes are established,the effects of the combustion simulation with different mesh sizes are compared and studied by using chemical kinetic combustion models,and at the same time the effects of three turbulence models on the combustion calculation are studied by using the mid-sized mesh size models with the standard k–ε,ζ–f and RSM-SSG models. The research shows that there are no obvious effects of mesh size and turbulence models on the macroscopic parameters and there are clear differences in the microcosmic parameters for the spatial distribution of CO and C_2H_4 obtained by three different mesh size calculations,indicating that the finer the meshes are,the bigger the incomplete combustion products gather around the flame center of the front fuel spray,while there are similar spatial distribution patterns of CO and C_2H_4 calculated by three different turbulence models,with a certain differences in the temporal and spatial distributions of concentration.

关 键 词：网格尺寸 湍流模型 柴油机燃烧模拟 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]