Analysis of numerical results in high temperature congealment and chemistry non-equilibrium flow field

Abstract

Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit of retrofires both can be extended; reliability of retrofires and stability of burning can be improved. In this paper, using internal equivalent heat area in place of electric arc that created Ohm heat, the flow fields of thermodynamic equilibrium chemistry congealment and chemistry non-equilibrium in the plasma generator were simulated. The influences of the inlet prerotation angle of air, the inlet total pressure of air and the airflow compression angle of spray nozzle on the temperature on the surface of electrode nearby the electrode spot and the average temperature of outlet of spray nozzle were contrasted and analyzed. Considering the chemistry non-equilibrium flow, the change of temperature on the surface of electrode after ablation of electrode was further studied. As a result, when the internal flow field of plasma generator was calculated, if the computation model of congealment flow was used, although the parameter change rules were consistent with those of chemistry non-equilibrium, the results had much difference with the chemistry non-equilibrium. So the results of the computation of congealment flow cannot be completely used in quantitative analysis.

Keywords

plasma generator / chemistry non-equilibrium / ignition technique / numerical calculation