Development of Highly Accurate Analysis Method for Compressible Fluid Considering Radiation and Ablation

Abstract

To understand physical phenomena in gas circuit breaker, we developed a highly accurate analysis method for compressible fluid considering arc behavior. The feature of the method is as follows, (1) To suppress numerical oscillation, the product of density and internal energy is treated as unknown valuable of transport energy equation solved by CIP (Constrain of Interpolation Profile) method. (2) To consider the effect of ablation of nozzle wall the rate of evaporation is assumed to be proportion to the difference between the power emission rate of wall and the intensity of radiation in the space. (3) To solve linear equation systems appeared in pressure, electric and radiation fields, we have improved PCG (Preconditioned Conjugate Gradient) method by reduction of unknowns. We have applied the method to an ablation measurement test stand and an interrupter model of gas circuit breaker, and confirmed the calculation results agree with the experimental ones.