Experimental and numerical investigation of a flow induced by a pulsed plasma column

Abstract

The paper studies, both experimentally and numerically, a high-speed transient flow induced by a pulsed volume discharge in still air at low pressure. It is shown that, in the constricted mode, the discharge is capable of producing uniform deposition of the electrical energy into a long (24 mm in length), thin (less than 2 mm in radius) plasma column. Flow visualization experiments using particle image velocimetry (PIV) and high-speed shadow imaging indicate that this pulsed localized energy deposition generates a highly symmetrical cylindrical shock wave expanding at an average speed of 550 m/s within the first 40 μs after the discharge. Three-dimensional computational fluid dynamics (CFD) simulations successfully reproduce the experimentally observed flow structures and provide better insight into the complex discharge-induced flow. Modeling the trajectories of “virtual” particles within the CFD-predicted flow yields excellent agreement between numerical and PIV flow velocity profiles, and this comparison is used to quantify the rates of “rapid” energy thermalization in the pulsed discharge.

The Use of Spatially Multi-Component Plasma Structures and Combined Energy Deposition for High-Speed Flow Control: A Selective Review

“…The authors performed experiments on the study of a flow dynamics after pulse ionization of a half-space in front of a flat SW within a channel. These results, described in detail in [97,98], showed that a pulsed E. Koroteeva et al experimentally and numerically studied the flow induced by a pulsed plasma column in low-pressure quiescent air [99]. The authors used plasma sheets to pre-ionize the gas, which facilitated the formation of a volume discharge between them.…”

“…In [97][98][99], the group of I. Znamenskaya presented their results on obtaining the elements of a classical Riemann problem in an experiment. The authors performed experiments on the study of a flow dynamics after pulse ionization of a half-space in front of a flat SW within a channel.…”

“…Overall, employing various spatial and temporal arrangements of LSs within a supersonic flow, the authors demonstrated the potential for lowering the MW breakdown threshold and manipulating the shape and placement of the MW plasma. In [97][98][99], the group of I. Znamenskaya presented their results on obtaining the elements of a classical Riemann problem in an experiment. The authors performed experiments on the study of a flow dynamics after pulse ionization of a half-space in front of a flat SW within a channel.…”

Edge Detection and Machine Learning Approach to Identify Flow Structures on Schlieren and Shadowgraph Images

“…2). The optical system used for high-speed shadowgraph imaging is described in detail in [18]. The recording frame rate is up to 525 000 frames / s. The camera imaging exposure is 1 μs.…”

The Use of Spatially Multi-Component Plasma Structures and Combined Energy Deposition for High-Speed Flow Control. A Selective Review

“…Overall, employing various spatial and temporal arrangements of LSs within a supersonic flow, the authors demonstrated the potential for lowering the MW breakdown threshold and manipulating the shape and placement of the MW plasma. In [100][101][102] the group of I. Znamenskaya presented the results on obtaining the elements of classical Riemann problem in experiment. The authors performed experiments on the study of a flow dynamics after pulse ionization of a half-space in front of a flat SW within a channel.…”