Application of Similarity Theory to the Characteristics of Laminar Plasma Torch With Pure Nitrogen

Because of the complex generation process, the jet characteristics of laminar plasma torch were always studied by experiments at present. In order to reduce the experimental costs and the workloads, the similarity theory is a good method to study the characteristics of the laminar plasma jet. Thus, with some experimental results under specified conditions, the relationships between the characteristics and the working parameters have been obtained to predict the characteristics with other specified working parameters. Compared with the experimental results, the theoretical arc voltage characteristics, thermal efficiency characteristics, and jet lengths characteristics coincided with the experimental ones with a difference lower than 2%, 2.5%, and 8%, respectively.