大气压空气滑动弧等离子体发射光谱诊断

为了解Ar添加对空气滑动弧等离子体的影响，在放电频率f=10 kHz、空气流量q_Air=15 L·min^-1、 1 atm下进行了Ar体积流量q_Ar对空气-Ar滑动弧放电的影响试验研究，重点分析了不同q_Ar及调压器电压U_调下空气等离子体的活性粒子种类、电子密度及振动温度。结果表明，滑动弧等离子体区的主要活性粒子为OH、 N₂的第二正带系、 Hα、 O原子、 ArⅠ及ArⅡ原子，其中O原子及ArⅠ、 ArⅡ原子的相对光谱强度明显较强；随着q_Ar的增大，O(777.4 nm)的相对光谱强度先缓慢增长、再快速增大到极大值、随后缓慢减小并趋于稳定，O(777.4 nm)的相对光谱强度在1 580～6 650 a.u.之间变化；随U_调增大，O(777.4 nm)的相对光谱强度增大，且电压对其影响受q_Ar的影响：在高q_Ar(4～6 L·min^-1)工况下，O(...

Emission Spectroscopy Diagnosis of Air Gliding Arc Plasma Under Atmospheric Pressure Condition

To understand the effect of argon on the air gliding arc plasma, an air gliding arc plasma was generated at a discharge frequency of 10 kHz and an atmospheric pressure with q_Air=15 L·min-1 to study the effect of Ar volume flow on air-Ar gliding arc discharge. And then focused on the analysis of the active particle species, electron density and vibration temperature of air gliding arc plasma under different Ar volumetric flow rates and voltage of the voltage regulator. The results show that the main active particles in the gliding arc plasma region are OH，the second positive band system of N₂，H_α，O atoms，Ar Ⅰ and Ar Ⅱ atoms. It is found that the relative spectral intensity of O and ArⅠ, ArⅡ atoms is strong. With the increase of Ar volume flow, the relative spectral intensity of O(777.4 nm) increases slowly at first, then quickly increases to a maximum value, then slowly decreases and tends to stabilizes, and the relative spectral intensity of O(777.4 nm) varies between 1 580~6 650 a. u. The relative spectral intensity of O(777.4 nm) increases as the voltage of the voltage regulator increases. Moreover, the influence of voltage of the voltage regulator on the relative spectral intensity of O(777.4 nm) is affected by the volume flow of Ar: The relative spectral intensity of O(777.4 nm) changes significantly under high Ar volume flow (4~6 L·min-1). The addition of Ar significantly increases the relative spectral intensity of OH (313.4 nm), the relative spectral intensity of OH(313.4 nm) varies between 235~311 a. u. As the volume flow of Ar increases, the relative spectral intensity of OH(313.4 nm) first increases and then decreases and tends to stabilize. At a lower voltage (100 V), the relative spectral intensity of OH(313.4 nm) does not change significantly with the volume flow of Ar. As U_R increases, the relative spectral intensity of OH (313.4 nm) changes significantly with the volume flow of Ar: at low Ar volume flow (0~4 L·min-1), the relative spectral intensity of OH (313.4 nm) increases significantly with the increase of Ar volume flow. A Gaussian fitting is made with the H_α spectral lines to analyse and calculate the electron density. It is found that the electron density is between 1.15~2.04×1017 cm-3. Keeping the air flow constant, the addition of Ar can significantly increase the electron density: when q_Ar is 0~4 L·min-1, the electron density has an apparent growth trend. As q_Ar continues to increase, at lower U_R (100~120 V), the electron density first increases and then decreases and tends to stabilize. At the higher U_R (140~160 V), the electron density first increases and then slowly increases and tends to stabilize. The change of the U_R will also affect the electron density. The electron density increases with U_R, and as the U_R increases, the electron density growth trend becomes faster.