Abstract: Optimization design of a hundred-percent reversible axial fan is conducted by the method of three-dimensional optimization design based on design of experiment, flow analysis and blade profile modification. The results show that the performance of the fan is improved significantly without changes of diameter, rotation speed and tip clearance. At designed condition, the efficiency of positive rotating fan is 82.3% by 9.1% improved and the efficiency of negative rotating fan is 79.1% by 3.3% improved. The internal flow field of the fan is reasonable without obvious separations and back flows. The total pressure distribution at the fan outlet is improved as well. The performance of the fan at different flow rate is fine with the smooth performance curve. The three-dimensional optimization design of the axial fan is successfully validated by the experi-mental results.

Key words: Fan, Subway, Three-dimensional optimization design