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从螺旋正交坐标系下的Navier-Stocks方程组出发,利用realizable k-ε湍流模型和SIMPLEC算法,对直管和多种不同几何尺寸的螺旋管内的流动进行了数值模拟,研究了螺旋管的扭率τ、管径与曲率半径比r/Rc、入口速度vi以及流体粘度对螺旋管内迪恩涡的影响。模拟结果表明:扭率和曲率比的变化会引起螺旋管内轴向速度、径向速度最大值的偏移和速度大小的变化;径向速度和全压在入口速度低于约0.8 m/s时随入口速度递增;流体粘度的提高引起径向速度和全压的增大,并有利于迪恩涡旋的形成。
Based on the Navier-Stocks equations in the spiral orthogonal coordinate system, the realizable k-ε turbulence model and the SIMPLEC algorithm are used to simulate the flow in a straight tube and a variety of helical tubes with different geometrical dimensions. Torsion rate τ, ratio of tube radius to radius of curvature r / Rc, inlet velocity vi, and fluid viscosity on the Dean vortex in the coil. The simulation results show that the change of the torsion ratio and the curvature ratio will cause the variation of the axial velocity and the maximum radial velocity and the magnitude of the velocity in the helical tube. When the inlet velocity is lower than about 0.8 m / s With the inlet velocity increasing; the increase of viscosity of the fluid caused the increase of radial velocity and total pressure, which is also beneficial to the formation of Dean vortex.