Thermal state of uncooled quartz discharge channel of powerful high-frequency induction plasmatron

This paper studies the thermal state of VGU-4 HF-plasmatron uncooled quartz discharge channel at HF-generator anode power values of 45 and 70 kW for three working gases (air, carbon dioxide and pure nitrogen). Experiments were carried out to obtain temperature fields of discharge channel at different working gas mass flow rate. Maximum wall temperatures were observed in carbon dioxide plasma. Inductively coupled plasma flow numerical modeling was made on the basis of Navier-Stokes and simplified Maxwell equations for the experimental conditions. It was shown that the influence of different quartz wall temperature boundary conditions on the calculated air plasma flow parameters at the channel exit section is negligible. The calculation results of temperature fields for nitrogen and air plasma were close, which is in accordance with the experiment. Calculated stream function isolines and isotherms are in accordance with the schematic view proposed by Yu.P. Raizer.

HF-plasmatron, induction discharge, quartz discharge channel

Тепловое состояние неохлаждаемого кварцевого разрядного канала мощного высокочастотного индукционного плазмотрона

Исследовано тепловое состояние неохлаждаемого кварцевого разрядного канала ВЧ-плазмотрона ВГУ-4 при мощности ВЧ-генератора по анодному питанию 45 и 70 кВт для трех рабочих газов (воздух, углекислый газ, азот). Проведены эксперименты с целью получения полей температур разрядного канала в зависимости от массового расхода рабочего газа. Максимальная температура стенки разрядного канала наблюдалась в плазме углекислого газа. На основе уравнений Навье-Стокса и упрощенных уравнений Максвелла проведено численное моделирование течения индукционной плазмы для условий экспериментов. Показано, что влияние различных вариантов задания температурных граничных условий для кварцевой стенки на расчетные параметры потока воздушной плазмы у выходного сечения канала незначительно. Результаты расчета температурных полей для плазмы воздуха и азота оказались близкими, что согласуется с экспериментом. Расчетные изолинии функции тока и изотермы соответствуют теоретически предсказанным Ю.П. Райзером.

ВЧ-плазмотрон, индукционный разряд, кварцевый разрядный канал

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