“…The radical difference between the problem considered and the problems [7][8][9] consists in an arbitrary angle α of inclination of the electrode plates and the dependence of the volume heat source on the temperature T . The importance of taking inclination of the electrodes to the direction of the gravity force into account was shown earlier experimentally [11]. In this study, using initially vertically and horizontally directed discharge trunks as particular examples, it was demonstrated that the discharge shape and its dynamics depend significantly on the spatial orientation of the electrodes.…”
supporting
confidence: 51%
“…In particular, according to data on the arc parameters [11], condition (1.3) is fulfilled for discharges in the air medium on graphite electrodes under moderate currents (hundreds of A) and the effect of the self-magnetic fields generated by the flowing currents on the physico-mechanical processes in the gap and electrodes can be neglected.…”
Section: Formulation Of the Problem Physico-mechanical Modelmentioning
The mathematical formulation of the problem of analysis of the stability of flows of a conducting continuous medium associated with Joule heat generation in an inclined plane layer in the presence of the gravity force is formulated. A one-dimensional steady-state background solution is found. Volt-ampere characteristics (VAC) are constructed and investigated. It is shown that S-shaped voltage dependences of the current density can exist under certain conditions when three solutions with different current densities are possible for a given voltage. The solution with the mean current density that corresponds to the VAC fragment with a negative differential resistance is unstable. A model of analysis of two-dimensional perturbations based on the Oberbeck-Boussinesq equations and a thermal discharge model is proposed.
“…The radical difference between the problem considered and the problems [7][8][9] consists in an arbitrary angle α of inclination of the electrode plates and the dependence of the volume heat source on the temperature T . The importance of taking inclination of the electrodes to the direction of the gravity force into account was shown earlier experimentally [11]. In this study, using initially vertically and horizontally directed discharge trunks as particular examples, it was demonstrated that the discharge shape and its dynamics depend significantly on the spatial orientation of the electrodes.…”
supporting
confidence: 51%
“…In particular, according to data on the arc parameters [11], condition (1.3) is fulfilled for discharges in the air medium on graphite electrodes under moderate currents (hundreds of A) and the effect of the self-magnetic fields generated by the flowing currents on the physico-mechanical processes in the gap and electrodes can be neglected.…”
Section: Formulation Of the Problem Physico-mechanical Modelmentioning
The mathematical formulation of the problem of analysis of the stability of flows of a conducting continuous medium associated with Joule heat generation in an inclined plane layer in the presence of the gravity force is formulated. A one-dimensional steady-state background solution is found. Volt-ampere characteristics (VAC) are constructed and investigated. It is shown that S-shaped voltage dependences of the current density can exist under certain conditions when three solutions with different current densities are possible for a given voltage. The solution with the mean current density that corresponds to the VAC fragment with a negative differential resistance is unstable. A model of analysis of two-dimensional perturbations based on the Oberbeck-Boussinesq equations and a thermal discharge model is proposed.
“…Одной из технических проблем при экспериментальном изучении протяженных (несколько см и более) дуг является проблема стабильного инициирования разряда и обеспечение минимальных помех на измерительные цепи. В частности, при инициировании разряда в воздушной среде атмосферного давления при межэлектродных расстояниях 15 ÷ 18 мм требовались напряжения осциллятора более 50 кВ [5]. Поэтому в последние годы при изучении протяженных электрических дуг на электроразрядной установке НИИ механики МГУ применяется инициация разряда посредством смыкания электродов с последующим их раздвижением до выбранного межэлектродного расстояния 0 мэ l l .…”
Section: постановка задачи и схема измеренийunclassified
“…Эксперименты с дугами на соизмеримых графитовых стержневых электродах показали, что форма дуги (при квазистационарных режимах ее питания) весьма нестационарная и неединственная [5]. Соответственно и картина течения межэлектродной среды (особенно при размыкании электродов) достаточно сложная, включающая динамику дугового столба, электродных факелов и опорных пятен.…”
Section: разряды между идентичными стержневыми электродами 41 оценкunclassified
“…Основной акцент сделан на изучении влияния режимов инициирования разряда на формирование и развитие как токового канала, так и сопутствующих ему течений межэлектродной среды. Для достижения возможности получения различных режимов размыкания первоначально сомкнутых электродов была адаптирована разработанная ранее система инициирования дуг [5] путем комбинирования различных противовесов для координатного и блокового механизма электромеханического устройства раздвижки.…”
Investigations have been carried out of an electric arc discharge in atmospheric air at atmospheric pressure, both between commensurable electrodes and massive anodes many times larger than the cathode. The main emphasis is placed on an experimental study of vertical arcs initiated by opening the electrodes by conducting high-speed video recording of the discharge and synchronously taking waveforms of the current and voltage of the arc column. It is shown that the flow of electric current and flows of the interelectrode medium substantially depends on the opening speed of the electrodes and the size and shape of the anodes.
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