Research on Dynamic-static Interaction and Excitation Characteristics of Multi-stage Axial Fan Based on CFD
In order to investigate the dynamic-static interaction and excitation characteristics of multistage axial fan,analyze the effect of different phase arrangement of each stage impeller on the aerodynamic performance and flow field excitation of the fan,the numerical simulation of the five-stage axial fan model was carried out.The phase angle of each stage impeller is changed into 0°,2°,4°and 6°respectively,and the internal flow field and performance parameters of the axial fan as well as the force situation of each stage impeller are obtained.The results show that with the increase of the phase arrangement angle,the impeller blade squeeze the fluid greatly,resulting in the deterioration of the flow behaviours downstream,and the efficiency decreases by about 2.1%.The main characteristic frequency of the force on each stage impeller is the blade frequency(fBPF)and its multifrequency,and the amplitude decreases rapidly with the increase of frequency.Meanwhile,the influence of the phase angle on the force of each stage impeller is also reflected in the flow field performance and fluid energy.The more stable the flow field,the more concentrated the characteristic frequency and the higher the amplitude.
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