振动控制静电微射流雾化特性试验研究OA

A piezoelectric ceramic actuator was used to apply sinusoidal vibration excitation to the jet,and a vibration-controlled electrostatic micro-jet atomization characteristic test platform was established.High-speed imaging technology was used to study the morphological change law of anhydrous ethanol simple jet mode under external vibration.By analyzing the length of the stable segment of the jet,the influence of different vibration parameters on micro-jet stability was explored.The results indicate that the applied vibration intensifies the transition of the electrostatic micro-jet from varicose instability to whipping instability,accelerates the transition from whipping instability to whipping-assisted bifurcation changes,expands the range of whipping-assisted bifurcation occurrence,and increases the voltage re-quired for the occurrence of dendritic fragmentation.As the vibration frequency f increases,the length of the stable section of the jet continues to decrease,and the whipping instability morphology is more significantly affected by the change in vibration frequencyf than the flexural morphology.At Bo=1.51,the decrease in the stable section length of the whipping morphology is 83.2％.As the vibration ampli-tude A increases,the length of the micro-jet stable segment gradually shortens.The flexural and whip-ping morphologies decrease by 44.4％and 64.6％,respectively,compared to the no-vibration condition when the vibration amplitude A is 7.5 μm.The length of the stable segment of the whipping morphology is more easily influenced by changes in vibration amplitude.