Experimental research into a new design of flow-averaging tube

This paper presents the results of investigations into a new design of flow-averaging tube (FAT). The design uses two flow-averaging profiles that affect each other. One of these profiles receives a positive pressure p+, and the other a negative pressure p−. The differential pressure obtained, Δp=p+−p−, is considerably higher than the differential pressure in other probes on the market. The research reported here aimed to optimize the respective positioning of the profiles. The experiments were performed in an aerodynamic tunnel. Subsequently, tests of prototypes with the profiles were conducted in pipelines with diameters of 104–296 mm. The results are presented in the form of the characteristics of the flow coefficient KK as a function of the mean velocity of the air passing through a pipeline. It was found that the new probe design was associated with relatively high measured differential pressures. The observed characteristics are flat over an extensive flow range. This makes it possible to use a constant flow value without degrading the measurement uncertainty.

► This paper includes the results of investigations into a new two-profile flow-averaging tube.
► The measured differential pressure is relatively high, giving a low value of the KK-factor.
► The observed characteristics of the KK-factor are flat over an extensive flow range.
► Experiments were realized in a wind tunnel and pipelines.
► Construction of the flowmeter is simple and easy for installation in pipeline.