Abstract
In this study, three-dimensional models of tube axial fan designed to have the same or different chord length for each radius were analyzed by large eddy simulation (LES) in an incompressible state. Both tube axial fan models were built under the assumption that the optimal total pressure distribution in the span direction is a non-free vortex flow. As a result, the distribution of static pressure and total pressure of a tube axial fan whose chord length varies by radius is larger than that of a tube axial fan with the same chord length for each radius, and the difference in size is the smallest at the design operating point. The distribution of static pressure efficiency and total pressure efficiency at the design operating point of the tube axial fan whose chord length varies for each radius is smaller than that of the tube axial fan with the same chord length for each radius. In terms of overall aerodynamic performance, the design method of the tube axial fan with the chord length changing by radius is the best, but the design method of the tube axial fan with the same chord length for each radius is comparatively useful from the design operation point.
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