Investigation of a cylindrical, axially blown, high-pressure arc

Abstract

An experimental arrangement for the production of a quasi-stationary, high-current arc is described. It is stabilized by an axial gas flow in a high-pressure environment (current: 1900 A, pressure: 23 atm, gas: nitrogen). The conditions are described under which part of the arc assumes a cylindrical form. For such an arc the radial temperature distribution was measured. Because of the cylindrical shape a relatively simple evaluation yields quantitative data about the local radiative energy balance and the other energy transport mechanisms. This leads, for the first time, to a quantitative understanding of the different physical processes in this arc, and makes it possible to formulate a simplified arc model which is useful in practical applications.

Controlling the differential resistance of axial blown arcs

“…Only in the segment right around the throat the convection term gets slightly larger than the radiation term. This disagrees with the results 4 from [14], but agrees with the results from [15] who show a radially resolved energy balance at an axial position close to the throat. Downstream of the throat position (at 105 mm, indicated by red dashed line), the convection term in this implementation becomes negative.…”

Current interruption limit and resistance of the self-similar electric arc

“…12 To derive the equations for the arc core temperature T 0 ͑t͒ and area A͑t͒ = R 2 , consider a temperature profile T͑r͒ = ⌬T⌰͑R − r͒ + T 1 with ⌬T = T 0 − T 1 , where T 1 is the blow-gas temperature outside the arc core. For details we refer to Refs.…”

Fractional variational principles and their applications

“…Fractional derivatives [1,2] started to play an important role in many branches of science and engineering. Various applications of fractional calculus in physics [3][4][5][6], robotics [7] and control theory [8,9] have been obtained. For almost all systems that contain internal damping, the traditional energy-based approach cannot be used to obtain the correct equations describing the behavior of a nonconservative system.…”