摘要
本文发展了一种可用于发动机进气门处流场计算的紊流模型。这是因为用标准的k-ε双方程紊流模型,发现其计算结果与作者的试验结果不够吻合。根据作者的实验发现,产生误差的一个重要原因是气门内气道处气体流动状态的各向异性。本文将紊动粘性系数μ_t 看作是一个张量,由此得到了文中修正的k-ε模型,并将标准的k-ε模型和修改了的k-ε模型的计算结果和实验数据进行了对比。结果指出,修改了的k-ε模型对气道内流场的预测精度又提高了一步。本文对模型气道内的流场利用热线风速仪进行了实验研究,考察了平均速度和紊动能的分布及生成规律,指出了设计气道时值得注意的一些问题。
In the paper a turbulence model for calculating the flow field in theintake port of engine has developed.It is because that the calculationresults with the standard κ-ε double-equation turbulence model is not ingood agreement with the authors' experimental ones.According to ourexperiment,it is found that the reason causing the error is the anisotropismof turbulence in the port.Here,the turbulence viscosity coefficient μ,isconsidered as a tensor so that the modified κ-ε model is obtained.Theresults of comparisons between the calculation and experimental data showthat the modified κ-ε model predicts the anisotropic flow in the intake portof engine reasonably.In the (?)aper the flow field in a model port is measured with the HWAand the distribution of mean velocity and turbulence kinetic energy isconsidered.Some problems which should be paid attention to in designingports are pointed out.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
1989年第2期117-123,共7页
Transactions of Csice
