迷宫式滴头内流动的有限元数值分析

Numerical Simulation of Flows inside a Drip Faucet by Finite Element Method

借助笛卡尔坐标系下时均 Navier Stokes方程 ,采用加罚有限元数值方法模拟了“圆弧型迷宫”式滴头内流动场。在数值计算的基础上 ,对滴头内流动场进行了分析。并针对防堵塞要求 。

The drip faucet plays an important role in drip irrigation system and the flow field has a key effect on its performance, so it is necessary to study the flow pattern in detail. In this paper, making use of the Galerkin Penalty Finite Element method, the Reynolds number averaged NavierStokes equation in two dimension under the Cartesian coordinate system were employed to numerically solve the flow fields in an arc type labyrinth drip faucet. The arc type labyrinth drip faucet was recently developed for drip irrigation system. Through numerical calculation, the original design of drip faucet was modified. On the other hand, the flow fields and the flow characteristics in the drip faucet at different flow rate Q =4 0 L/h, 6 0 L/h and 8 0 L/h were analyzed in detail. For turbulent flow, the Kε turbulent model was represented. All these features can help us to understand the flow mechanism in the drip faucet and guide us to reasonably design a new drip faucet. The numerical results showed that the new arc type drip faucet was propitious to drip irrigation system, especially in the case of turbulent flows. Finally, according to the anti choke principle, a suggestion was recommended to improve the performance of the drip faucet.