收缩管型压电微滴喷射理论分析与实验研究

为了得到驱动电压波形对收缩管型压电微滴喷射性能的影响规律,基于Bogy等提出的压力波传递理论,分析了收缩管型压电微滴喷射头喷腔中的压力传导过程。构建了压电微滴喷射系统的实验平台,以质量分数为58%的甘油和水混合液为实验中的喷射对象,对微滴喷射过程中驱动电压的脉冲宽度、幅值和频率对微滴喷射性能的影响进行了研究。研究结果表明,随着驱动电压脉冲宽度的增大,所形成的液滴速度和直径呈先增大后减小,微滴喷射过程存在最佳电压脉冲保持时间;随着驱动电压脉冲幅值的增大,所形成的液滴速度和直径均增大;随着操作频率的增大,在一定范围内,液滴速度和直径几乎不受影响,但频率过大时,喷射会发生混乱。

Theoretical Analysis and Experimental Study on Squeeze Piezoelectric Micro droplet Jetting

In order to get the effect of driving voltage waveform on the performance of squeeze piezoelectric micro droplet jetting, based on the pressure wave propagation theory of Bogy, analysis of the pressure conduction process in nozzle chamber of squeeze piezoelectric micro droplet jetting was carried out. The experimental platform of the piezoelectric micro droplet jetting system was constructed. The glycerol of 58% consistency was used as jet object in the experiments. The effects of pulse width, pulse amplitude and operation frequency of driving voltage on the performance of piezoelectric micro droplet jetting were studied. The results showed that with the increase of the pulse width of the driving voltage, the velocity and diameter of droplets were increased firstly and then decreased, there was an optimal dwell time in micro droplet jetting process; with the increase of the pulse amplitude of the driving voltage, the velocity and diameter of droplets were increased; with the increase of the operation frequency of the driving voltage, the velocity and diameter of droplets were scarcely affected in a certain range, but if the frequency was too large, the jet would be in chaos.