层流动能转捩模型改进方法研究  

Investigation on a Improved Laminar Kinetic Energy Transition Model

作　　者：陈灿平[1,2] 赵庆军[1,3] 孙小磊[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院研究生院,北京100190 [3]中国科学院轻型动力重点实验室,北京100190

出　　处：《工程热物理学报》2013年第8期1424-1428,共5页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划(973计划)资助项目(No.2010CB227302);国家自然科学基金资助项目(No.50906081)

摘　　要：本文通过在湍流黏性系数表达式中引入流线曲率因子和间歇因子的方法对某层流动能转捩模型进行了改进,并利用ERCOFTAC T3系列平板实验结果和双圆弧压气机叶栅的实验数据对改进后模型的预测能力进行了校验。结果表明,考虑间歇性的影响能够加速模型中层流动能向湍流动能的转化,提高了模型对Bypass转捩的预测精度;流线曲率因子的引入改进了湍动能输运方程的生成项,增强了模型在分离区内的湍流生成能力,能够提高模型对分离流转捩的预测精度。In this paper, a laminar kinetic energy transition model is modified by the introduction of the streamline curvature factor and the internfittency factor in the turbulent viscosity coefficient. The experimental data of the ERCOFTAC T3 series and double circular arc compressor cascade are used to verify the accuracy of the modified model. The results show that an appropriate intermittency factor can accelerate the transition process from laminar kinetic energy to turbulent kinetic energy, which can improve the predicted accuracy of the model to the Bypass transition. And the results also indicate that the streamline curvature factor in the small-scale turbulent viscosity coefficient expression tends to increase the turbulence generation in separation zone, which can enhance the simulated ability of the model in the separation transition.

关 键 词：Bypass转捩 分离流转捩 间歇因子 流线曲率因子 

分 类 号：O357[理学—流体力学]