基于动网格的轴流式燃气调压器数值模拟

Numerical Simulation of Axial-flow Gas Pressure Regulator Based on Dynamic Mesh

为了研究轴流式燃气调压器阀口启闭过程中流场的变化,以北京某现场使用的轴流式燃气调压器为原型,用Solidworks 12.0软件建立简化的轴流式燃气调压器内部流道的三维模型,采用ANSYS ICEM CFD15.0软件对该三维模型进行有限元网格划分,应用FLUENT15.0软件对内部流场进行数值模拟。该模拟使用动网格技术,给出动网格的算法及设置方法。选择2种典型的分离涡模型(Spalart-Allmaras DES模型、SST k-ωDES模型)及1种常规的雷诺时均模型(RANS Standard k-ε模型)进行模拟,对比3种模型模拟得到的轴流式燃气调压器计算域的瞬时压力场分布云图、计算域中平面2的瞬时压力场分布云图、平面2的瞬时速度场分布云图、平面2的瞬时速度矢量图、平面2的瞬时流线分布。模拟结果表明,分离涡模型较雷诺时均模型具有更高的模拟精度。

In order to study the change of flow field during the valve opening and closing process of axial-flow gas pressure regulator, taking the axial-flow gas pressure regulator used at a site in Beijing as the prototype, the simplified three-dimensional model of the internal flow channel of the axial-flow gas pressure regulator is established by Solidworks software. The finite element meshing of the three-dimensional model is carried out by ANSYS 1CEM CFD 15.0 software. The FLUENT software is used to simulate the internal flow field. This simulation uses the dynamic mesh technology, and gives the dynamic mesh algorithm and setting method. Two typical Detached Eddy Simulation （DES） models （Spalart-Allmaras model and SST k-ε DES model） and one regular Reynolds Averaged Navier-stokes （RANS） model （RANS Standard k-ε model） are selected for simulation. The instantaneous pressure field distribution of the computational domain of the axial-flow gas pressure regulator, the instantaneous pressure field distribution in plane 2 in the computational domain, the instantaneous velocity field distribution in plane 2, the instantaneous velocity vector in plane 2 and the instantaneous streamline distribution in plane 2 simulated by the three models are compared. The simulation results show that the DES model is more accurate than the RANS model