Experiment on Averaging Pitot Tubes in Different Flow Fields

In order to study the property of averaging Pitot tube with different flow fields,three kinds of typical averaging Pitot tube,namely diamond,delta and Verabar,were selected to be tested in three different facilities including normal pressure gas facility,critical nozzle facility and wind tunnel facility.The analysis of such performance indexes as flow coefficient,linearity and uncertainty showed that flow coefficient,linearity and uncertainty were steady in the same flow fields,and that in different flow fields,flow coefficient and linearity varied greatly,while uncertainty remained lower than 1.0% in any flow field,and even lower than 0.2% in wind tunnel.To be used in different flow fields and acquire an accurate measurement,the averaging Pitot tube should be calibrated carefully according to applied flow field.