An integral arc model for ablation controlled arcs based on CFD simulations

Abstract

A simple integral arc model for ablation arcs in tubes is presented. The model predicts the arc temperature in the axis, the average electrical field strength, the pressure generation and the mass ablation rate at the tube wall. The model is entirely based on first principles and does not require fit parameters. This is achieved with the help of detailed numerical arc simulations which use a combination of a radiative energy transfer code and computational fluid dynamics. This allows a physically correct and consistent averaging over the arc when deriving the integral model. New experiments for validation of the model were done. The results of the model are in satisfactory agreement with the older and new experimental data. The dependences of the predicted arc parameters are discussed for tube radii and lengths in the parameter range R = 2-8 mm and L = 40-80 mm, respectively.

Modeling Electric Discharges with Entropy Production Rate Principles

“…For example, the mass distribution follows more or less the needs of the power balance: when somewhat more mass is required to satisfy energy balance, it will be sucked into the arc core from the surrounding without significant resistance. Only in the case of a concrete physical mechanism for such resistance, like mass production due to material ablation by radiation of an arc constricted in a tube [23], or a strong, externally forced mass flow, as in certain types of gas circuit breakers [24], mass balance may become as predominant as energy balance.…”

Numerical and experimental investigations on thermal interaction between thermal plasma and solid polymer powders using induction thermal plasma technique

“…The first of them, PTFE, contains C and F atoms; its structural formula is [-CF 2 CF 2 -] n . It has an extremely low coefficient of friction, a nonreactive character, and high melting temperature of 618 K and evaporation temperature of 809 K. This material is widely used as a nozzle material in high-voltage circuit breakers [4,12,13,14]. Both PMMA and POM include C, H, and O atoms.…”

Improved Method for Direct Black-Box Arc Parameter Determination and Model Validation

“…Physical arc models often describe only the stationary arc behavior or, if dynamic behavior is included, they are applicable only for arcs under special conditions [8]. Apart from that they usually fail to model the dynamic behavior due to mathematical problems.…”