Numerical Simulation of the Airflow of the Multi-blades Fan of Air-conditioning System and the Optimization of the Volute

摘要

The existing and mature CFD technology is applied in this paper. Through the simulation of the prototype fan, it's found that there are obvious vortices in the cochlea part of the fan. Two schematic plans are adopt to improve efficiency of the fan.These vortices can cause high energy loss. At the same time, they increase noise of the ventilator in air-conditioning system and affect efficiency of the fan. The first scheme is to increase radius of the cochlea. The second scheme is to change the cochlea into tilted. Some experiments of the velocity of outlet of the fan also have been carried on which are in order to make some comparison. It can be found that unsuitable change of the cochlea radius caused more disorder airflow rather than improve the cochlea vortices. So the conclusion obtained is that the key issue is to find the suitable radius of the cochlea in design of the fan. During the design of tilted cochlea, a satisfying outcome is obtained.