正交实验法对平板型双介质阻挡放电等离子体助燃特性的影响因素分析

Analysis on Influence Factors of Parallel Plates Double-dielectric Barrier Discharge Plasma Assisted-combustion Characteristics in the Combustor by Using the Orthogonal Experimental Method

采用正交实验法研究了受多因素影响的燃烧室等离子体助燃特性,定量分析了燃烧室等离子体助燃特性的影响因素的作用机制,得到了改善助燃特性的最优组合方案。分析结果表明:等离子体助燃的研究中,选取了6个因素5个水平,通过正交实验法,实验次数由5~6减少至25;提高燃烧效率、降低CO排放量、改善出口温度分布和缩短湍流混合时间的最优组合方案分别为E_1F_2A_4D_2B_5C_5、E_1A_4B_5F_2C_5D_2、E_3A_2B_5D_5F_5C_2、E_3B_5A_2F_3C_1D_1;对于非平衡介质阻挡放电的等离子体助燃,放热量是影响燃烧效率、CO排放因子、出口温度分布系数和湍流混合时间的最显著因素,高频交流激励下温升效应是等离子体强化燃烧的最主要途径。研究结果可为等离子体助燃激励器的结构优化和参数控制,以及激励施加方式的选择提供依据。

Orthogonal experimental method is used to analyze some factors that influence plasma assisted-combustion characteristic in combustor. The mechanism of plasma assisted-combustion in combustor is investigated quantitatively. Optimization schemes that improve plasma assistedcombustion characteristics are obtained. Analysis results indicate that 6 factors and 5 levels are selected in researches on plasma assisted-combustion and the number of experiment is reduced from 56 to 25; optimization schemes of improving combustion efficiency, decreasing CO emission, improve outlet temperature distribution and reducing turbulent mixing time are E1 F2 A4D2B5C5.E1A4B5F2C5D2、E3A2B5D5F5C2、E3B5A2F3C1D1; for plasma assisted-combustion of non-equilibrium dielectric barrier discharge, heat release is the most obvious factor that affects combustion efficiency, CO emission factor, outlet temperature distribution coefficient and turbulent mixing time and temperature rise effect is the most important pathway for plasma enhancement combustion. Investigation results can provide some basis for the parameter control and structure optimization of plasma assisted combustion actuators and the selection of applied actuation mode.