三声道燃油超声波流量计内部流场数值研究

针对三声道燃油超声波流量计圆截面多弯曲管道，基于不可压缩雷诺时均Navier-Stokes方程建立流量计管道内计算流体动力学仿真模型。使用重整化群k-ε湍流模型、有限容积法和结构化网络进行离散化，并在近壁区采用标准的壁面函数法修正，完成对三声道燃油超声波流量计的管道内部湍流的数值模拟。数值研究结果表明，在8种不同进口速度条件下，3个声道的流场沿中心线均是不均匀分布；H-H声道流场变化最大，P-P声道流场最平稳；P-P声道测量精度最好，而H-H声道测量精度最差。

Numerical Study of the Internal Flow Field in Three-channel Fuel Ultrasonic Flow-meter

For the circular section bend pipe of the three channel fuel ultrasonic flow meter, a computational fluid dynamic model is established on the basis of the incompressible Reynolds-averaged Navier-Stokes equations.The numerical simulation of the flow field characteristics in the pipeline is achieved by the renormalization group?k-ε?turbulence model, by applying the finite volume method and the structured grid for performing discretization, and standard wall function for modification in the near-wall region.The simulation results indicated that, under the eight kinds of different inlet velocity conditions, three channels velocity profiles are similarly not uniform and vary dramatically change along the axial direction of the pipe.The greatest change in the flow field characteristics is the H-H channel; the least change that is the P-P channel.The P-P channel has the best measurement accuracy and the H-H channel has the worst one.