2D Numerical Method on Averaging Pitot Tubes

To accurately predict differential pressure and internal flow field of averaging Pitot tube by using 2D simulation method,five 2D simplified models,achieved through three principles,are studied.The five models are used respectively in the simulation of DN200 diamond averaging Pitot tube at the residuals of 0.001 and 0.000 1 and the speed of 11.18 m/s.After comparing the simulation data with the experimental data,it’s found that the relative errors of cross-section 4 are 0.91% and-1.9% respectively,which are better than the other four models.So the cross-section 4 is used to simulate the flow field of the DN200 diamond and Delta Pitot tube at four different velocity points within the flow range at the residual of 0.000 1.The results show that the maximum relative errors of diamond and Delta Pitot tubes are-3.3% and 2.92% respectively.Compared with the other four models,the model of section 4 is more suitable for flow field simulation and coefficient prediction of the averaging Pitot tube.