What is the definition of swirl number for swirlers used in burners? What is it used for?

01 January 2016 1 4K Report

is a measure of the angular momentum of the combustion air. It is characterized by the swirl number, S, defined as the ratio of the axial flux of angular momentum to the axial flux of axial momentum.

http://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node351.htm

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