Li Kai, Liu Jun-Kao, Chen Wei-Shan, Zhang Lu
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China.
Aero Engine Corporation of China, Harbin Dongan Engine Corporation LTD, Harbin 150001, China.
Micromachines (Basel). 2017 Jul 5;8(7):213. doi: 10.3390/mi8070213.
Piezoelectric micro-jets are based on piezoelectric ink-jet technology and can achieve the drop-on demand requirements. A piezoelectric micro-jet which is designed for bearing lubrication is presented in this paper. In order to analyze the fluid dynamic characteristics of the piezoelectric micro-jet so as to obtain good injection performance, a direct coupling simulation method is proposed in this paper. The effects of inlet and viscous losses in the cavity are taken into account, which are close to the actual conditions in the direct coupling method. The effects of the pulse excitation parameters on the pinch-off time, tail length, velocity, and volume of the droplet are analyzed by the proposed direct coupling method. The pressure distribution inside the cavity of the micro-jet and the status of the droplet formation at different times are also given. In addition, the method is proved to be effective in predicting and analyzing the fluid dynamic characteristics of piezoelectric micro-jets by comparing the simulation results with the experimental results.
压电微喷射器基于压电喷墨技术，能够满足按需滴注的要求。本文介绍了一种专为轴承润滑设计的压电微喷射器。为了分析压电微喷射器的流体动力学特性以获得良好的喷射性能，本文提出了一种直接耦合模拟方法。该方法考虑了腔内入口和粘性损失的影响，在直接耦合方法中更接近实际情况。通过所提出的直接耦合方法分析了脉冲激励参数对液滴夹断时间、尾长、速度和体积的影响。同时给出了微喷射器腔内的压力分布以及不同时刻液滴形成的状态。此外，通过将模拟结果与实验结果进行比较，证明该方法在预测和分析压电微喷射器的流体动力学特性方面是有效的。
