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·OH在众多领域中具有非常重要的作用,在国际上引起了广泛关注,而大气压等离子体射流由于不需要真空、装置简单易于携带,且具有高浓度活性粒子、高电子温度、低射流温度等优点,具有极强的应用前景,成为气体放电领域的重要研究课题。特别是如何诱导等离子体射流中·OH的产生已成为等离子体射流领域一个新的研究热点。国外率先报道了将水蒸汽以一定的比例混入等离子体射流工作气体中以诱导产生大量·OH的研究,然而当含水量较高时,射流会剧烈摆动,放电变得十分不均匀、不稳定。为此,本文设计了一种大气压双环电极氩气等离子体射流诱导水产生·OH的装置,通过引入超声雾化装置增加等离子体羽周围的湿度以提高·OH含量,重点研究了不同电压、流量下诱导水生成OH(A2Σ+)的生成规律;利用发射光谱法测试了装置产生·OH的含量;并利用810.41和811.48nm这两条Ar原子光谱线,计算了等离子体羽中的电子温度。结果表明等离子体羽可以诱导周围的水产生·OH,且随电压从20kV增大到28kV时,OH(A2Σ+)的产量逐渐增大;而当氩气流量从100L·h-1增大到200L·h-1时,·OH产量随着流量的增大而增大,但是当氩气流量从200L·h-1增大到600L·h-1时,·OH产量随着流量的增大而不断减小。OH(A2Σ+)的产量和电子温度变化趋势完全一致,证明了·OH的产量主要受电子温度的影响。
· OH plays a very important role in many fields and has drawn wide attention in the world. However, the atmospheric pressure plasma jet is simple and easy to carry because it does not need a vacuum, and has high concentration of active particles, high electron temperature, low jet temperature and the like Advantages, has a very strong application prospects, has become an important research field of gas discharge. In particular, how to induce the generation of · OH in a plasma jet has become a new research hotspot in the field of plasma jet. Abroad first reported the water vapor into a certain percentage of plasma jet working gas to induce a large amount of · OH research, but when the water content is high, the jet will swing violently, the discharge becomes very uneven and unstable. For this reason, this paper designed a device for inducing water to produce · OH by argon plasma jet with double-ring electrode. By introducing ultrasonic atomizing device to increase the humidity around the plasma plume to increase the · OH content, we focused on the different voltage and flow rate The generation of OH (A2Σ +) in water was induced under the same conditions. The content of · OH in the device was measured by emission spectroscopy. The electron temperature in the plasma plume was calculated by using two spectral lines of 810.41 and 811.48 nm. The results show that the plasma plume can induce the generation of · OH around the water, and the output of OH (A2Σ +) gradually increases with the increase of voltage from 20kV to 28kV. When the argon flow increases from 100L · h-1 · OH production increased with the increase of flow rate at 200L · h-1, but · OH output increased with the increase of flow rate when the argon flow rate increased from 200L · h-1 to 600L · h-1 And keep decreasing. The trend of OH (A2Σ +) yield and electron temperature are consistent, which proves that the yield of · OH is mainly affected by the electron temperature.