两种差分格式和两种湍流模型在轴对称冲击射流数值计算中的比较

Comparison of two difference schemes and two turbulence models in the numerical computations of an axisymmetric impinging jet flow

用延迟修正QUICK和乘方两种差分格式,结合标准k ε模型和一种基于重正化群(RNG)思想的k ε模型,对半封闭轴对称湍流冲击射流场进行了数值模拟。通过与实验结果的比较,考察了两种差分格式对计算结果的影响,并讨论了两种湍流模型对冲击射流场的数值预测能力。研究表明:当都采用标准k ε模型时,QUICK格式得到的结果比乘方格式更接近于实验值,尤其对湍动能分布;当都采用QUICK格式时,RNGk ε模型的预测值比标准k ε模型更准确。

The deferred correction QUICK and the power law schemes in conjunction with the standard kε model and an RNG kε model are applied to the numerical sim ulation of a semiconfined axisymmetric impinging jet flowfield. By compariso n with the experimental data, the effects of the two difference schemes on the com putational results are examined. Numerical capabilities of the two models in pre dicting an impinging jet flowfield are discussed. It is found that the computa t ional results obtained by QUICK scheme are closer to the experimental data than those by powerlaw scheme when standard kε model is used, especially f or the turbu lent kinetic energy profiles. Predictive results obtained by RNG kε model are more accurate than those by standard kε model when QUICK scheme are adopted.Key words: difference scheme;impinging jet;turbul ence model;numerical computation