摘要
利用张量不变性原理建立了一种考虑变形率张量Ｓ和旋转张量Ω影响的非线性代数应力模型。利用该模型对几种内燃机缸内流动进行了模拟计算，其结果与ｋ－ε模型相比，在定性和定量上均有所改进。
Turbulent flows in the cylinder of an internal combustion engine are highly unsteady, strongly compressible and anisotropic, and have strong swirl. These features make the standard k-ε turbulent model not suitable for engine applications. A nonlinear constitutive relation has been madebetween the Reynolds stress and the strain rate tensor S as well as the rotation tensor O by applying the tensor invariance theory, which consists of six independent tensors that are sa-lnmetric,have zero trace and involve up to three-cider terms such as SΩ2 and SΩ2. A nonlinear algebraicstress model has been derived from the eonstitutive relation by using the Reynolds stress transportequation with pressure-strain interaction term simulated by Launder, et al. and Rodi first assumption (linear assumption).Calculations for several flows in the cylinder of internal combustion engines have been nlacleby applying the new turbulent mobal. And some qualitative and quantitative improvements in thecaleulation results over those of the standard k-εturbulellt model have been obtained.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
1996年第3期249-256,共8页
Transactions of Csice
关键词
缸内
湍流模型
数值模拟
内燃机
Turbulent model, Numericki simulation, Internal combustion engine
