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为研究等离子体辅助燃烧的化学反应机理,数值模拟了氢-氧混合气中的交流激励介质阻挡放电过程,考虑了包括O+、2O+、+2H、H+4种正电荷粒子,电子、O-、2O-、3O-、OH-、H-6种负电荷粒子,以及O、O2、O3、H2、H、OH、H2O 7种中性粒子等17种组分、47种反应,以分析放电产物的时间和空间特性以及气体压力的影响。结果表明:O和H原子是等离子体辅助燃烧的主要活性成分,2O+、OH和OH-也有一定影响;O原子在整个放电周期内密度变化很小,H原子密度随时间变化相差2个量级以上;随着气压降低,O和H原子的电离度先增大后降低,0.8P0(P0=1.01325×105Pa)时最高;从高压电极到地电极,O原子的电离度逐渐降低,H原子电离度则先增大后降低,最大值靠近放电区域中心点。
In order to study the chemical reaction mechanism of plasma assisted combustion, the AC-excited dielectric barrier discharge process in a hydrogen-oxygen mixed gas was numerically simulated, including positive charged particles O +, 2O +, + 2H, H + , 17 kinds of components such as 2O-, 3O-, OH-, H- 6 kinds of negatively charged particles and 7 kinds of neutral particles of O, O2, O3, H2, H, OH and H2O, 47 kinds of reactions, The product’s temporal and spatial characteristics and the effect of gas pressure. The results show that O and H atoms are the main active components in plasma assisted combustion and have some effects on 2O +, OH and OH-. The density of O atoms changes little during the whole discharge cycle, and the density of H atoms changes with time by two orders of magnitude . The ionization degree of O and H atoms first increased and then decreased with the decrease of pressure, and the highest was at 0.8P0 (P0 = 1.01325 × 105Pa). From the high voltage electrode to the ground electrode, the ionization degree of O atom gradually decreased and H atom ionization Degree first increases and then decreases, the maximum value near the discharge area center.