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Title: Impact Of Swirl On Flow Measurement In Stacks - CFD Modelling
Author: J. Gerl S. Knotek Z. Belligoli R. Dwight R. Robinson
Source: Flomeko 2016
Year Published: 2016
Abstract: In this paper we investigate a swirling flow in stacks which is generated by various shapes of supplyi ng pipe. We determine error s of flow rate measurement when the method with S - type Pitot tubes measuring gas speed in a grid of points is used. This research is motivated by increasing legal requirements for unc ertainty in emission monitori ng. The considered supplying pipes are - a straight pipe, pipe with single 90 elbow and pipe with double out - of - plane 90 elbow. The considered range of Reynolds numbers is 3.10 5 to 3.10 6 . The flow in stacks is investigated by means of CFD modelli ng using the OpenFOAM software. We show that the error of flow rate oscillates with changing height of the sampling plane in the stack. This is caused by a velocity profi le which is turned by the swirl . The span of the error oscillation can reach 3 % in th e considered cases.

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