改进的Baldwin-Lomax湍流模型及其在叶轮机械中的应用  

An Improved Baldwin-Lomax Turbulence Model and its Application in Turbomachinery

作　　者：杨金广[1] 吴虎[1] 

机构地区：[1]f西北工业大学动力与能源学院,陕西西安710072

出　　处：《工程热物理学报》2014年第3期451-455,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51076131)

摘　　要：对于Baldwin和Lomax代数湍流模型的两个主要缺点,即不同流动情况下长度尺度的不确定性以及尾迹区处理的模糊性,本文进行了针对性的改进.在固壁区域,采用基于函数值的加权平均方法计算长度尺度;在尾迹区,基于熵包线的概念来确定尾迹中心线和确定搜索范围.同时还提出了若干增强模型稳定性的措施.将所改进模型用于复杂的叶轮机械内流问题,分别以二维和三维压气机转子为算例,进行了改进模型的验证以及与基准模型进行了比较.结果发现,改进的模型能够正确地模拟物理现象,具有更高的精度,同时也提升了求解器的收敛性.It is well known that there are two primary drawbacks for Baldwin-LoInax （BL） algebraic turbulence model, including the uncertainty of determining length scale and the vagueness in the wake region treatment. An improved BL model is proposed in present paper. In the solid wall region, an F function weighted method is used to calculate the length scale; in the wake region, the entropy envelope concept is utilized to determine the wake centerline and search range. Meanwhile several measurements are proposed to improve the robustness of the model. The improved model is applied to complex turbomachinery flow. A 2D compressor cascade and a 3D fan rotor are taken as cases to validate the model. It is found that the improved model posses higher accuracy and robustness compared the baseline one.

关 键 词：Badwin—Lomax湍流模型 计算流体力学 叶轮机械 尾迹 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]