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conservation angular momentum swirling flow

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Old   October 20, 2007, 11:15
Default conservation angular momentum swirling flow
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Hi, I am working with CFD to analyze a swirling burner with a square section combustor. When I calculate the angular and the axial momentum inside the combustor, it decreases the more I check downstream to the burner exit. Do you know what would create a decrease in the angular and axial momentum inside a square section combustor? Should the swirl number variate inside the combustor?

Thank you very much for your help.
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