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压电风扇利用压电材料的压电特性,将压电材料制成作动器激励薄片振动进而带动周围空气流动,可作为电子设备的散热装置。使用Fluent商用软件,利用动网格技术模拟压电风扇产生的非定常流场。研究振动薄片的振动频率、压电风扇长度(流场长度)以及振动薄片长度与压电风扇长度的比值等参数对压电风扇出口风速的影响。研究表明:增大振动薄片的振动频率、增大压电风扇长度以及在一定范围内增大振动薄片长度与压电风扇长度的比值均能提高出口风速。振动频率与出口风速成线性关系。随着压电风扇长度的增大,出口风速提高得越来越慢。存在一个临界值,当振动薄片长度与压电风扇长度的比值大于该临界值时,出口风速随着比值的增大而下降。
Piezoelectric fans use the piezoelectric characteristics of the piezoelectric material, the piezoelectric material made of the actuator excitation sheet vibration and then drive the ambient air flow can be used as electronic devices cooling device. Fluent commercial software is used to simulate unsteady flow fields generated by piezoelectric fans using moving grid technology. The influence of vibration frequency, length of piezoelectric fan (length of flow field) and the ratio of length of vibration plate to length of piezoelectric fan on the exit velocity of piezoelectric fan was studied. The results show that increasing the vibration frequency, increasing the length of the piezoelectric fan and increasing the ratio of the length of the vibration plate to the length of the piezoelectric fan within a certain range can increase the outlet velocity. Vibration frequency and outlet velocity into a linear relationship. As the length of the piezoelectric fan increases, the outlet wind speed increases more slowly. There is a critical value, when the ratio of the length of the vibration sheet to the length of the piezoelectric fan is greater than the critical value, the outlet wind speed decreases as the ratio increases.