压电风扇结构设计与参数影响研究

压电风扇主要包括由压电材料制作的驱动器和振动薄片，驱动器激励振动薄片振动进而产生气流流动，是一种新型的散热装置。研究多种参数对压电风扇性能的影响，为压电风扇的设计提供指导性的意见和建议。使用计算流体方法，模拟压电风扇流场的发展过程，研究了压电风扇振动薄片的振型、双振动薄片的排布形式以及在每种排布形式下两振动薄片振动相位差等因素对出口风速的影响。得到以下结论:驱动器的激振频率应等于振动薄片的一阶固有频率；双振动薄片模型，两振动薄片的最佳振动相位差分别是π（纵向布置）和0.8π（横向布置）。通过分析流场发展过程，给出了参数影响的成因。 

Structure design of piezoelectric fans and research on influence of parameters

A piezoelectric fan mainly consists of vibrating plate and actuator made by piezoelectric material. Vibrating plates are driven by actuators to cause fluid motion, which is a new kind of device for removal of heat. The purpose of this research is to investigate the influence of several parameters on the performance of piezoelectric fans and give advice to the design of piezoelectric fans. The method of computational fluid dynamics is used in this research to simulate the development of piezoelectric fan's flow field. Three parameters are studied including flexural modes of vibrating plates, double-plate orientation and phase difference between two plates. The results are as follows: the frequency of actuator should be equal to the fundamental resonance frequency of vibrating plate; for the models with two vibrating plates, the best phase difference is π (plates oriented in vertical direction) and 0.8π (plates oriented in horizontal direction). The cause of parameter influence is presented through analyzing the development of the flow field.