Abstract
In this paper the object of research was the rotor rim of axial fan manufactured by MULTWING with the designation 5ZL. Experimental tests of the fan with the above mentioned rotor rim were carried out with factory tip clearance of 5 mm. Next, the geometry of the rotor rim was mapped and numerical simulations were carried out, as a result of which, displacements of the tip of the rotor blade were determined. Based on the results of mechanical simulations and the Traupel formula the possibility was found to reduce the tip clearance to 1 mm. In the next step, numerical flow simulations were performed for both tip clearance values. Obtained results, in the form of basic characteristics of axial fan, were compared with experimental results.
Highlights
A distance, called radial clearance or tip clearance [10] must be maintained between blades of the rotor rim and the cover in each flow machine
It should be remembered that too large tip clearance generates flow losses affecting the performance of flow machines [9]
Mechanical deformation analyses based on the finite element method (FEM) allow for obtaining results convergent with experimental results
Summary
In this paper the object of research was the rotor rim of axial fan manufactured by MULTWING with the designation 5ZL. Experimental tests of the fan with the above mentioned rotor rim were carried out with factory tip clearance of 5 mm. The geometry of the rotor rim was mapped and numerical simulations were carried out, as a result of which, displacements of the tip of the rotor blade were determined. Based on the results of mechanical simulations and the Traupel formula the possibility was found to reduce the tip clearance to 1 mm. Numerical flow simulations were performed for both tip clearance values. In the form of basic characteristics of axial fan, were compared with experimental results.
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