Study Of The Property Match For Counter-rotating Axial Flow Fan From A Different Angle

As a new style of impeller machinery, contra-rotating fan has a series of good merits such as compact conformation, convenient to install and operate, high total pressure, and so on. It has been paid more and more attention at home and abroad fan enterprises in recent years. But we don't know well about its operation principle, especially about the matching of the two rotor blades. In actual running process, the mismatching about the two stage impeller's pressure rise and electric motor's power emerges as a result of the mismatching between the two established angles. With the development of CFD technology, it is possible to carry out numerical simulation to research the whole flow field with the aid of modern technology.With the given prototype, this paper uses the CFD software to establish a model and carry on the simulation to its pressure field. Change the angle to make new models based on the given prototype. The RNGκ-εmodel is used to close the governing equations. Finite volume method is used to discretize the governing equations. Numerical simulation of the whole flow field of the contra-rotating fan is performed under different working conditions with the SIMPLIC algorithm. CFD software is used to simulate some parameters such as pressure and velocity filed of the contra-rotating fan, under different flow rate and angle of incidence of wing.According to the simulation results, different types of flow phenomena are observed in the whole flow passage of the contra-rotating fan, and its operating performance under different working conditions is also understood. The general rule of established angles variations to the running performance is obtained. The simulation results can provide the reference for the related performance test and avoid blindness to design. At the same time, it will reduce experiment's economic cost and curtail the design cycle.