摘要
对标准κ-ε模型、重整化群κ-ε模型、可实现κ-ε模型和κ-ω模型等4种不同的湍流模型在预测叶栅稳态流动的能力方面进行了研究。采用时间推进的压力耦合方程的半隐算法(SIMPIEC),求解了稳态可压缩的雷诺平均Navier-Stokes方程及不同的湍流模型。通过一个叶栅流动算例,分析了这4种湍流模型本身的特点,并对其预测不同流动的能力进行了比较。数值分析结果表明:采用标准κ-ε模型进行计算时,在较大负冲角工况下,不能在叶栅压力面前缘预测到分离的产生;在零冲角和不大的正冲角工况下,在50%叶高处叶片表面,κ-ε模型所计算的等熵马赫数比κ-ω模型更接近实验值;其它两种湍流模型预测能力在两者之间。
The usability of four turbulence models, i.e. the standard κ-ε, the renormalization group κ-ε, the realizable κ-ε and the κ-ε model, for predicting the steady flow in cascades has been studied. Reynold＇s averaged Navier-Stokes equation for steady compressible flow, together with various turbulence models, is solved by using SIMPIEC algorithm lor these four Results of numerical analysis show that, under large negative incidence angle flow conditions, separation at leading edge＇ s pressure surface can not been predicted by means ofκ-ε models. Under zero or small positive incidence angle flow conditions, the calculated isentropic Mach number at 50% blade＇s height gets closer to experimental values if the κ-ε model is used instead of the κ-ε model. The ability of prediction of the two other models lies between that of the κ-ε and the κ-ε model. Figs 5 and refs 9.
出处
《动力工程》
EI
CAS
CSCD
北大核心
2005年第6期761-764,共4页
Power Engineering
关键词
动力机械工程
湍流模型
叶栅
数值分析
power and mechanical engineering
turbulence model
cascade
numerical analysis
