Transactions of Nanjing University of Aeronautics & Astronautics
Effect of TipBlade Cutting on the Performance of Large Scale Axial Fan
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Abstract:
The effect of tipblade cutting on the performance of a large scale axial fan was investigated using computational fluid dynamics (CFD) methods. Experiments verified the numerical simulations. The original fan was compared with the one with tipcutting in terms of dimensionless characteristic and aerodynamic performance in tip region under the conditions of the maximum efficiency point and nearstall point. The results showed that double leakage flow occurred in tip clearance at maximum efficiency point and spillage of leakage flow from leading edge occurred in tipblade region at nearstall point for the both two fans; and that tipcutting with 6% of blade height could reduce the intensity of tipleakage vortex and increase flow capacity in tip blade region, and hold the stall margin almost the same as the original fan. The maximum efficiency of the fan with tipcutting was improved by 1%, and the ability of total pressure rising was obviously greater than the original fan.
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