基于压电激励的多股均匀液滴生成

For solving the uniform droplets generation problem of multi-stream jets based on piezoelectric excitation， the influences of piezoelectric excitation frequency and waveform on droplet generation characteristics were studied. The droplet diameter， uniformity and jet fragmentation distance were obtained by processing jet images based on image capture technology. The experiment results showed that when the jet velocity was fixed，the characteristic wavelength of the jet fragmentation and the droplet diameter decreased with the increment of excitation frequency. Apart from the optimal excitation frequency of jet fragmentation predicted by the jet instability theory，the liquid resonance in the cavity also affected the jet fragmentation distance and the droplet generation characteristic. With the same excitation frequency and voltage amplitude，the triangular wave with the lowest energy consumption had the shortest jet fragmentation distance and the most excellent droplet generation characteristics，followed by the sine wave. The square wave with the highest energy consumption had the worst droplet generation characteristics. Therefore， the criterion for selecting the exciting waveform of single-strand jet is not suitable for multi-stream jets.