摘要
本文利用涡量 流函数法系统地研究了扇环形截面弯曲管道内的二次流动 ,计算结果表明了采用控制体积积分法对涡量 流函数方程进行离散来求解弯曲管道内粘性流动问题是成功的 ,这样可以避免对压力项的处理 ;对所得结果的分析揭示了该二次流动不仅受雷诺数和曲率影响 ,而且扇形中心角。
In this paper the N S equations in a curvilinear coordinate system are satisfied by stream function and vorticity, therefore the orders of pressure are removed. Then the numerical solutions to the fully developed laminar fluid flow in a curved annular duct are obtained by employing the control volume based、finite difference method. The study indicates that this method can solve the problem of fluid flow in curved pipe perfectly. Based on the solutions obtained, the secondary flow in the annular cross section is discussed in detail. The results indicate that the secondary flow is affected not only by the Dean number (Re and curvature) but also by the radius ratio and the annular angle. When the sector angle is smaller than π/2 only two vortices can be seen in the cross section, but when the sector angle is larger than π/2, the vortex structure can be very complex and is determined by other parameters.
出处
《空气动力学学报》
EI
CSCD
北大核心
2000年第2期216-221,共6页
Acta Aerodynamica Sinica
关键词
曲线管道
二次流动
涡量-流函数法
Flow in curved duct
Secondary flow
vorticity stream function method
