压缩对内燃机缸内湍能的影响  

The Effect of Compression on the Turbulent Flows in ICE

作　　者：李芳[1] 解茂昭[1] 

机构地区：[1]大连理工大学动力系,大连116024

出　　处：《内燃机学报》1999年第3期285-290,共6页Transactions of Csice

摘　　要：用能量法和结构法考察了在不同的初始条件下，压缩过程中缸内湍能的变化情况，并把湍能的产生和耗散作了比较。文中采用了ｋε模型和雷诺应力模型中的 Ｌ Ｒ Ｒ模型进行计算。结果表明：对于内燃机缸内湍流，压力膨胀项的作用完全可以忽略，也就是说，压缩对湍能的影响主要不是通过脉动膨胀来直接作用，而是通过改变湍流结构来影响湍能的，即通过改变雷诺应力的各向异性来改变湍能产生项，通过改变湍流时间尺度来改变耗散项。The variation tendency of turbulent kinetic energy k in the flow fields of in cylinder in ICE during compression under different initial conditions has been studied with two methods:energetic/explicit method and structural/implicit method.Comparison has been made between production and dissipation of turbulent kinetic energy under these initial conditions.Two models have been used: k ε model for compressible flows in the analysis with energetic method and LRR model which is one of the Reynolds stress differential models (DSM) in the analysis with the structural method.The results demonstrate that effect of the correlation of pressure dilation is negible for the turbulent flows of in cylinder in ICE,that is the effect of compressibility on turbulent energy is not directly influenced by the fluctuating dilatation (i.e. pressure dilatation correlation,and dissipation dilatation correlation),it's compressibility that changes the turbulent structure,then influences anisotropy tensor of Reynolds Stress and finally affects turbulent energy.

关 键 词：缸内湍能 κ-ε模型 脉动膨胀 湍流 内燃机 压缩 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]