纳秒脉冲等离子体合成射流特性实验研究

Experimental Study on Characteristic of Nanosecond Pulsed Plasma Synthetic Jet

关键词:  等离子体  合成射流  纳秒脉冲  激励特性

Key words:  Plasma  Synthetic jet  Nanosecond pulse  Actuation characteristics

摘要:

设计了新型的等离子体合成射流激励器，采用实验方法研究了该激励器的放电特性、合成射流强度特性以及时均冲力特性。实验结果表明:存在一个饱和激励频率使合成射流的强度达到最大值，当射流孔径为1mm和1.5mm时，这一饱和频率分别为4kHz和6kHz；随着与出口距离的增加，射流的强度呈指数衰减，射流的影响距离约为10mm；在4kHz下，激励器所产生的时均冲力随着激励频率的增加而近似线性增加，该时均冲力与单位长度介质阻挡放电(SDBD)激励器所产生的体积力处于同一量级(mN)，孔径为1.5mm下的时均冲力约为孔径为1 mm时的两倍。

Abstract:

A new type of plasma synthetic jet actuator was designed. The discharge characteristic，synthetic jet intensity and the time-averaged thrust of the actuator were researched by experiment. The results show that there exists a saturated frequency at which the jet intensity reaches the maximum. With an orifice diameter of 1 mm and 1.5mm，the saturated frequency of the actuator is 4kHz and 6kHz，respectively. As the distance away from the jet orifice increases，the jet intensity decreases exponentially and the influence distance of the synthetic jet is approximately 10mm. The time-averaged thrust increases with frequency in approximately liner way，when the actuation frequency is below 4kHz. The time-averaged thrust is in the same order(mN)of the body force induced by surface dielectric barrier discharge actuator per unit length. With a 1.5mm diameter，the time-averaged thrust induced by actuator is two times as that with a 1mm diameter.