HCCI发动机燃烧多维数值模拟(Ⅰ)——模型的建立和比较  

Numerical Simulation of Combustion in HCCI Engine Using Multi-Dimensional Model(Ⅰ)——Construction and comparison of models

作　　者：贾明[1] 解茂昭[1] 

机构地区：[1]大连理工大学动力工程系,辽宁大连116024

出　　处：《内燃机学报》2007年第1期1-8,共8页Transactions of Csice

基　　金：国家基础研究重点规划项目子课题(2001CB209201)

摘　　要：使用多维骨架动力学模型模拟了以异辛烷为燃料的均质压燃(HCCI)发动机的燃烧过程。通过结合多维CFD程序KIVA和反应动力学程序CHEMKIN实现了化学反应与流动的耦合运算。结果表明网格密度和时间步长对HCCI的燃烧过程影响不大,而初始温度对着火点影响显著。通过修改多维模型比较了RNG k-ε湍流模型和标准k-ε湍流模型、Han和Reitz传热模型和传统传热模型、Kong的混合模型和无混合模型,以及不同的缝隙区模型,发现使用RNG k-ε湍流模型、Han和Reitz传热模型和缝隙流动模型计算结果与实验值更为接近。修改后的多维模型在不同当量比下计算得到的压力、放热率和排放值与实验完全一致。Skeletal chemical kinetics model was used in a CFD code to study the combustion process of homogeneous charge compression ignition （HCCI） Engine fueled with iso-octane. The chemical kinetics code CHEMKIN was implemented into the multidimensional CFD code KIVA-3V so that the chemical reaction and flow were coupled. The results indicate that grid density and time step have little influence on HCCI combustion process, however the initial temperature influences ignition point greatly. Comparisons were made in RNG κ-ε turbulence model and standard κ-ε turbulence model, Han and Reitz heat transfer model and traditional heat transfer model, Kong turbulence mixing model and non-mixing model, and different crevice flow model. The results indicate that calculations by RNG κ-ε turbulence model, Han and Reitz heat transfer model, crevice flow model agree well with the measured than their counterparts respectively. The modified multi-dimensional model gives good prediction in cylinder pressure, heat release rate and emissions at various equivalence ratios.

关 键 词：均质压燃(HCCI)发动机 数值模型 多维模型 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]