非定常电场下锥射流的振荡行为研究

Study on oscillation behavior of cone jet under unsteady electric field

针对非定常电场作用下电雾化系统性研究缺乏的情况,结合空间发动机对电喷雾推进系统脉冲工作的需求,对非定常电场作用下锥射流的振荡行为进行实验研究,利用高速摄像机记录锥射流在非定常电压扰动作用下的脉动变形过程,探讨射流振荡频率与电压扰动频率的匹配关系,分析不同扰动电压参数对射流形态的影响。研究表明:在非定常电场作用下,当电压扰动频率处于低频与高频范围时,射流振荡频率与电压扰动频率接近,此时射流为振荡锥射流模式;扰动频率处于中频范围时,射流振荡频率处于300~500 Hz范围内,此时射流为间歇性喷射模式;随着非定常扰动电压幅值增大,射流处于间歇性喷射模式的频率范围增大,处于振荡锥射流模式的范围减小;电压扰动频率越高,处于振荡锥射流模式的射流锥角越大。

In view of the lack of systematic research on electro-atomization under the action of unsteady electric field in the existing literature,combined with the actual demand of the space engine for the pulse operation of the thruster,the experimental study on the oscillation behavior of the cone jet under the action of the unsteady electric field is carried out,using the high-speed camera which records the pulsating deformation process of the cone jet under the action of unsteady voltage disturbance.This paper discusses the matching relationship between the jet oscillation frequency and the voltage disturbance frequency,and analyzes the influence of different disturbance voltage parameters on the jet shape.Studies show that when the voltage disturbance frequency is in the low and high frequency range under the action of an unsteady electric field,the jet oscillation frequency is close to the voltage disturbance frequency,and the jet is in the oscillating cone jet mode;when the disturbance frequency is in the middle frequency range,the jet oscillation frequency is in the range of 300–500 Hz,and the jet is in the intermittent jet mode;as the amplitude of the unsteady disturbance voltage increases,the frequency range of the jet in the intermittent jet mode gets larger,and the range in the oscillating cone jet mode becomes smaller;The greater the voltage disturbance frequency is,the greater the cone jet angle of the jet in the oscillating cone jet mode is.