Effect of TipBlade Cutting on the Performance of Large Scale Axial Fan

Transactions of Nanjing University of Aeronautics & Astronautics

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Archive > Volume 32 Issue 6 > 2015,32(6):623-630 Prev Next

Effect of TipBlade Cutting on the Performance of Large Scale Axial Fan

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Abstract:

The effect of tipblade 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 tipcutting in terms of dimensionless characteristic and aerodynamic performance in tip region under the conditions of the maximum efficiency point and nearstall 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 tipblade region at nearstall point for the both two fans; and that tipcutting with 6% of blade height could reduce the intensity of tipleakage 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 tipcutting was improved by 1%, and the ability of total pressure rising was obviously greater than the original fan.

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