Numerical simulation and structure improvement on cyclone purifier for fresh air treating

Cyclone purifier has been conventionally used for separating particles from exhaustion. This paper, however, tried to develop a cyclone purifier for fresh air treatment in ventilation. Simulations were carried out based on continuity equation, momentum equation, RNG k-epsilon turbulent flow equation and Discrete Phase Model; the discrete griddings were both structural and non-structural; the software used was FLUENT. The separation efficiencies, pressure drops and the flow patterns of air in the cyclone purifier were simulated. Simulations show that the optimal incline angle of the impeller vane is 30º, and the best vane number is 12 within 2 - 5 m/s of air velocity in the cyclone purifier. Separation efficiency for particles size 10 micron is over 85 %, and pressure drop is less than 3.5 kPa. The simulations of separation efficiencies and  pressure drop were verified by experiments.