方形截面弯管二次流数值模拟

Numerical Simulation of the Secondary Flow in a Curved Duct of Square-shaped Cross-section

应用湍流大涡模拟方法对含有和不含导流叶片的方形截面 90°弯道的二次流动进行了数值模拟 ,同时给出了Taylor-Galerkin有限元离散格式。管道加装叶片后 ,形成了两对二次流 ,其强度较低且沿程变化不大 。

With the help of a large eddy simulation (LES) method for turbulent flows a numerical simulation was performed of the secondary flow in ninety degree curved ducts of a square-shaped cross-section with and without flow-guide blades. Meanwhile, presented is a Taylor-Galerkin finite-element discrete scheme. Two pairs of secondary flow were formed after the duct has been fitted with flow-guide blades. Owing to the low intensity of the secondary flow and its small change along the ducts the flow condition has been improved.