DSMC Analysis of Unsteady Chemical Reactions of Hydrogen Plasma in Cylinder

doi:10.19596/j.cnki.1001-246x.7891

Abstract

Abstract: Unsteady flow characteristics of particles in plumes are studied with direct simulation Monte-Carlo method (DSMC) in an 8×10^-6 s period. Dissociation model, recombination model and charge exchange model are included based on Bird's chemical reaction models. Molecular hydrogen H₂, atomic hydrogen H, atomic metal X, ion H₂⁺ and ion H⁺ are included. Influence on density distribution of particles in the field due to dissociation and recombination is studied. It shows that the number density of molecular hydrogen H₂ decreases and the number density of atomic H increases since dissociation rate of molecular hydrogen H₂ is faster than recombination of atomic H in the flow field. A charge exchange model is added in dissociation and recombination models. It shows that the number density of ion H₂⁺ decreases and the number density of ion H⁺ increases obviously in charge exchange model.

Key words: DSMC method, dissociation-recombination reaction, charge exchange reaction

CLC Number:

SU Yongyuan, LI Jie, FAN Zhenglei. DSMC Analysis of Unsteady Chemical Reactions of Hydrogen Plasma in Cylinder[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 36(5): 533-541.

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