Visualization of flow by blast waves produced by pulsed discharge

Znamenskaya, I.A.; Doroshchenko, I.; Naumov, D.S.; Ivanov, I.; Kuli-Zade, T.A.

Авторы: Znamenskaya I.A., Doroshchenko I., Naumov D.S., Ivanov I., Kuli-Zade T.A.
Журнал: Journal of Flow Visualization and Image Processing
Том: 23
Номер: 1-2
Год издания: 2016
Издательство: Begell House
Местоположение издательства: United States
Первая страница: 15
Последняя страница: 24
DOI: 10.1615/JFlowVisImageProc.2016016980
Аннотация: An experimental investigation of combined discharge (pulse volume discharge with preionization by plasma electrodes) was carried out: glow time and space characteristics, analysis of flow with discharge-produced blast waves. The contracted volume discharge (spatial gas discharge mode in contracted form) was considered as electrical breakdown − a 24-mm-long vertical plasma column was formed. As a result of the nanosecond-lasting breakdown, the internal energy of the gas increased and the pressure raised up, which led to the formation of gas flow with cylindrical shock (blast) waves. The flow evolution was visualized with the aid of high-speed shadowgraphy. The blast waves were recorded, their position and speed were measured; the instability of the post-discharge hot gas channel was also visualized. A two-dimensional numerical simulation of flow based on the Euler equations was performed. The model of pulse cylindrical energy deposition was used; initial conditions were taken from experimental data. An inverse problem was solved by comparing CFD with the position of experimental shock waves. It was shown that 20−22% of the combined discharge energy, stored in the capacitor, was converted into the internal gas energy (about 140-155 mJ). Shock waves from surface discharges were also visualized and analyzed.
Добавил в систему: Дорощенко Игорь Александрович

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Visualization of flow by blast waves produced by pulsed dischargeстатья