1.University of Electronic Science and Technology of China,Chengdu, Sichuan 611731, China;
2.Tokheim Hengshan Technologies(Guangzhou) Co, LTD, Guangzhou,Guangdong 510663, China;
3.Guangdong Provincial Academy of Metrology,Guangzhou, Guangdong 510405, China;
4.Development and Planning Office of Sinopec Hubei Branch,Wuhan, Hubei 430030, China
Abstract：For the circularsection bend pipe of the threechannel 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.
［1］Kurnadi D, Trisnobudi A. A multipath ultrasonic transit time flow meter using a tomography method for gas flow velocity profile measurement ［J］. Particle and Particle Systems Characterization,2006,23(3-4):330-338.
［2］Ruppel C, Peters F. Effects of upstream installations on the reading of an ultrasonic flow meter ［J］. Flow Measurement and Instrumentation,2004,15(3): 167-177.
［3］王雪峰,唐祯安.超声波气体流量计的管道模型仿真和误差分析［J］.仪器仪表学报,2009,30(12):2612-2618.
［4］胡鹤鸣,王池,孟涛.多声路超声波流量计积分方法及其准确度分析［J］.仪器仪表学报,2010,31(6): 1218-1223.
［5］何存富,刘飞,张力新,等.多声道超声波流量计在弯管段安装的适应性研究［J］.仪器仪表学报,2011,32(1): 6-12.
［6］Moore I P, Brown G J, Stimpson B P. Ultrasonic transit time flow meters modeled with theoretical velocity profiles: Methodology ［J］. Measurement Science and Technology,2000,11(12): 1802-1811.
［7］Lee G H, Choi Y D, Han S H. Measurement of developing turbulent flow in a U-bend of circular cross-section ［J］. Journal of Mechanical Science and Technology,2007,21(2):348-359.
［8］Sudo K, Sunida M, Hibara H. Experimental investigation on turbulent flow in a circular-sectioned 90 degree bend ［J］. Experiments in Fluids,1998,25(1):42-49.
［9］Yakhot V, Orszag S A. Renormalization group analysis of turbulence1,basic theory ［J］. Journal of Scientific Computing,1986,1(1):39-51.
［10］Sugiyama H, Hitom D. Numerical analysis of developing turbulent flow in a 180° bend tube by an algebraic Reynolds stress model ［J］. International Journal for Numerical Methods In Fluids,2005,47(12):1431-1449.
2013, Vol. 34 
