Theoretical investigation of supersonic flow control by nonthermal DC discharge

The Post Shock Nonequilibrium Relaxation in a Hypersonic Plasma Flow Involving Reflection off A Thermal Discontinuity

“…This property was explored for a discontinuous shock front, and thus the results of this study can be borrowed for estimation of the reflected and transmitted wave intensities immediately behind the shock front (at x = 0, t = 0). Once the state of the gas at this location is determined, the structure of the whole relaxation zone can be re-constructed using the relations (2,4,9,12,13,15,16). Besides, in the context of this research, the incident shock structure is just an initial condition, the subject to the initial gas temperature in the incident medium, T01, and Mi, and thus all the changes during the transitional period are considered relative to that in the incident wave.…”

“…The research topics involving interaction of shock waves with interfaces with plasma or gaseous media characterized significantly elevated temperatures or rarefaction have been of intense interest since the middle of last century. The vast pool of applications using plasma media includes aerospace, air flight and environmental domains, that can benefit from the research aimed at: achieving significantly reduced wave drag and thus increased aircraft speed, lowered fuel consumption, and ultimately a longer flight range [1]; the possibility of controlling the direction of a vehicle in flight via energy deposition in the flow around it [2][3][4]; and managing the sonic boom detrimental to the environment. On a laboratory scale, the topics of academic and applied interests include the shock-flame interaction and combustion [5], and the shock-assisted compression utilizing implosion toward the target [6] in fusion research.…”

Flow control with plasma‐based actuator in different velocity regimes: Momentum and heat transfer effects

“…[31,32] The development of localized arc filament plasma actuators and their use in controlling high-speed flows were studied in refs [33][34][35][36][37] . Recently, take into account special conditions for flow, a theoretical investigation of control of the oblique shock wave by DC discharge plasma is studied by Sohbatzadeh et al [43] However, the understanding of the physical mechanism underlying these operations is still incomplete. Nevertheless, it is difficult to explain some experimental results of the supersonic flow control only by heat.…”

“…[38,39] In spite of arc plasmas, in nonthermal (weakly ionized) plasmas, to the best of authors' knowledge, no theoretical work has been published in this field of research and only the experimental works [38][39][40][41][42] presented flow control of supersonic airflow by a weakly ionized DC discharge. Recently, take into account special conditions for flow, a theoretical investigation of control of the oblique shock wave by DC discharge plasma is studied by Sohbatzadeh et al [43] However, the understanding of the physical mechanism underlying these operations is still incomplete. In the present work, we try to show more evidence for nonthermal plasmas.…”

Computational Study of Surface Dielectric Barrier Discharge Plasma Actuator for Flow Control using COMSOL Multiphysics

“…CAPs can involve partially ionized gas, many active species (positive/negative ions, radicals) UV radiation and, transient electric field (Graves, 2012;Mehrabifard et al, 2017;Weltmann et al, 2010). Controlling the separation of flow with the use of atmospheric cold plasma is considered very promising (Jayaraman, Lian, et al, 2007;Shang & Huang, 2014;Sohbatzadeh et al, 2018). The separation of the flow from the surface will occur at high angles of attack in a variety of cases, including diffusers, cars, feathers of turbines and airfoils, and will always be accompanied by losses, which will reduce significantly the performance parameters and efficiency.…”