Flow-induced Vibration Characteristics of New Shape Blade of Contra-rotating Fan
In order to optimize the fluid-induced vibration characteristics of contra-rotating fan,a new shape blade with good performance and vibration reduction function was proposed by modifying the airfoil.The flow field performance of two contra-rotating fans were compared.The modal analysis was used to predict the resonance of two blades.With the unsteady pressure pulsation on the blade surface as fluid exciting force,andthe forced vibration response of blade monitoring point was calculated by using the modal superposition method.The results show that the new blade has a good aerodynamic performance,the forward aerodynamic performance is similar to that of the original fan,and the reverseaerodynamic performance is better than that of the original fan.At the rated speed,the frequency margin of the first stage new blade is 8.9%higher than that of the original blade,and the operation is safer.The maximum peak vibration acceleration response of the new blade monitoring point is lower than that of the original blade,and the new blade has a good damping effect.Comparing with the monitoring point of first-stage blade,the total vibration acceleration difference of the two blades at the second-stage blade monitoring point is the largest andthe damping effect of the new blade is more obvious,and the maximum difference is about 10.83 dB.
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