三维旋转滑动弧等离子体助燃激励器的光谱特性实验

An Experiment of Spectral Characteristics on Plasma-assisted Combustion with 3D Rotating Gliding Arc Discharge

为研究不同射流流量和放电电压下三维旋转滑动弧等离子体助燃激励器的光谱特性规律,对3种不同几何结构的电极,在大气压下进行了交流滑动弧放电等离子体的光谱信号测量。结果表明:当流量和电压越大时,三维旋转滑动弧放电等离子体的振动温度越高,即振动激发强度越强。同时,比较A、B、C 3种滑动弧放电等离子体电极结构的光谱特性后发现,A型电极在滑动弧放电过程中产生的等离子体的振动温度最高,最有利于激发产生等离子体。综合考虑以上几种因素发现,流量对振动温度的影响最为明显,流量越大,OH、O2和O等粒子的相对发射强度也越强。例如,在U0=120V下,当Q=40g/min时O的平均相对发射强度约为1 800a.u.unit,当流量增大到Q=100g/min时,O的平均相对发射强度为2 800a.u.unit。

In view of studying the spectral characteristic laws of plasma-assisted combustion with 3Drotating gliding arc discharge under different jet flow and voltages,three kinds of electrodes（A,B,C）withdifferent geometrical structures are investigated upon its spectral signalsof gliding arc discharge plasma alternating current under atmosphericpressure.The results demonstrate that the vibrational temperaturesbecome higher with increase of jet flow and voltage,that is,vibrational excitation intensity becomes fiercer during discharging.Simultaneously,compared with the gliding arc discharge plasma spectral characteristics of another two electrodes,A with higher vibrational temperature of plasma during discharging is the best one to actuate the plasma.In consideration of factors mentioned above,the influence of flow rates onthe vibrational temperature is the most obvious.The larger the flow rate triggers,and the stronger the relative emission intensity of particles such as OH,O2 and O.For instance,the average emission intensityof O isabout 1 800 a.u.unit under 40g/min（U0=120）,and as the flow increasesto 100g/min,the average emission intensity of O enlarges to 2 800 a.u.unit.