针对直接测量等离子体射流温度操作繁琐且粒子种类易受干扰的问题,本文基于发射光谱 法分析了不同功率下大气放电等离子体射流的温度特性。通过针-筒电晕放电装置,在气压为0.2 MPa的条件下,以空气为介质对不同放电功率下的等离子体发射光谱进行诊断。采用玻耳兹曼斜率法和双谱线强度法对粒子的振动温度和电子温度进行计算,并通过LIFBASE软件对分子的转动温度进行拟合。计算结果表明,随着功率从500 W上升到1 000 W,发射光谱相对强度随着功率的升高而 增 强,同时活性粒子的种类也在增加,粒子的振动温度从5 200 K上升至7 000 K左右,电子激发温度从16 700 K上升至17 200 K左右,拟合出分子的转动温度在300—550 K之间。研究结果表明,放电功率直接影响等离子体射流温度和粒子的种类,并且该研究可对等离子体表面处理应用提供参考。

The direct measurement operation of plasma jet temperature is complicated and the particles types are easily disturbed,in this paper,the temperature characteristics of atmospheric discharge plasma jets are analyzed based on emission spectroscopy at different powers.The plasma emission spectra at different discharge powers are diagnosed by a pin-canister corona discharge device with air as the medium at a atmospheric pressure of 0.2 MPa.The vibration temperature and electron temperature of particles are calculated by Boltzmann slope method and bispectral intensity method,and the molecular rotational temperature is fitted by LIFBASE software.The results show that with the increase of power from 500 W to 1 000 W,the relative intensity of emission spectrum increases with power,and the types of active particles also increase,the vibration temperature of particles increase from 5 200 K to 7 000 K,and the electron excitation temperature increases from 16 700 K to 17 200 K,the fitting molecular rotation temperature is between 300 and 550 K.It is concluded that the discharge power directly affects the plasma jet temperature and particle type,and this study can provide reference for the application of plasma surface treatment.

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“十四五”江苏省重点学科项目(2021135) 资助项目