采用仿秋沙鸭翼型叶片贯流风机的气动性能数值研究

To improve the performance of the air conditioner and meet the energy-saving needs, this paper studies the optimization of the cross flow fan based on the bionic design of blades and the improvement of the impeller stagger angle Firstly, the profile features at the 40% span of the merganser wing are extracted by the reverse engineering, and the bionic blade of the cross flow fan is designed according to the product process requirements. Then, a 3D numerical calculation model is applied to numerically simulate the internal flow field of the cross flow fan with bionic blades inspired by the merganser wing. The effect on the aerodynamic performance of the cross flow fan with the bionic impellers which have different stagger angles is studied. Finally, the bionic impeller with a stagger angle of 5°, which has the best aerodynamic performance, is selected for the processing test. It is shown that the 3D numerical calculation results can effectively reveal the axial flow characteristics in the cross flow fan, the impeller stagger angle has a significant influence on the flow field near the middle plates of the impeller, and that using the bionic impeller inspired by the merganser wing can improve the flow state of the airflow near the inlet and outlet of the impeller and increase the strength of the eccentric vortex and the power efficiency of the impeller. It can be seen from the experimental results that the proposed fan remains substantially the same in air volume at the same rotation speed and shows a maximum power reduction of 3. 3% and 2. 7% under the air supply and cooling conditions respectively and a maximum noise reduction of 0. 3 dB compared with the prototype.