单介质阻挡放电等离子体致动器在稳定致动下对流动的热效应

IF 4.1 2区 工程技术 Q1 MECHANICS Physics of Fluids Pub Date : 2024-09-10 DOI:10.1063/5.0220507
Longxiang Zhao, Zuoli Xiao, Feng Liu
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引用次数: 0

摘要

对稳定致动器下的单介质阻挡放电等离子致动器的热效应进行了数值研究。提出了一种新的致动器模型,并利用实验数据进行了验证。采用基于高阶通量重构方案的离散 Galerkin 方法,在非结构化四边形网格上求解流动控制方程和致动器模型方程。通过比较有等离子体热源和无等离子体热源致动器的诱导热流场和冷流场,揭示了其热效应。致动器产生具有丰富涡度的热壁射流,形成具有高温和低密度核心的单极起始漩涡。随着时间的推移,起始漩涡变得不稳定,并转变为偶极。致动器加热可提高射流速度和宽度以及涡旋稳定性,同时减缓涡度的产生。致动器加热引起的密度场和温度场的相对变化要比没有致动器加热时大四个数量级。此外,致动器加热导致背景热力学场随时间近似线性增加。由于时间的积累,致动器的热效应分为两个阶段。最初,致动器加热对单极起始涡旋运动的影响很小,温度场和密度场被视为由速度场驱动的被动变量。在这一阶段,可以分别研究致动器的动量效应和热效应。然而,在起始涡旋变得不稳定之后,致动器加热会对其运动和形态产生重大影响,这两种效应会相互耦合。
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Thermal effect on the flow induced by a single-dielectric-barrier-discharge plasma actuator under steady actuation
The thermal effect of a single-dielectric-barrier-discharge plasma actuator under steady actuation is numerically investigated. A new actuator model is proposed and validated using experimental data. A discrete Galerkin method based on high-order flux reconstruction schemes is employed to solve the flow governing equations and the actuator model equations on unstructured quadrilateral grids. By comparing the induced heated and cold flow fields of the actuator with and without a plasma thermal source, its thermal effect is revealed. The actuator generates a thermal wall jet with rich vorticity, forming a monopolar starting vortex with a high-temperature and low-density core. Over time, the starting vortex becomes unstable and transforms into a dipole. Actuator heating enhances jet velocity and width, as well as vortex stability, while slowing down vorticity generation. The relative change in density and temperature fields due to actuator heating is four orders of magnitude greater than that without actuator heating. Additionally, the actuator heating causes the background thermodynamic fields to increase approximately linearly with time. Two stages in the actuator's thermal effect are distinguished due to time accumulation. Initially, the actuator heating minimally affects the monopolar starting vortex motion, and the temperature and density fields are treated as passive variables driven by the velocity field. During this stage, the momentum and thermal effects of the actuator can be studied separately. However, after the starting vortex becomes unstable, the actuator heating significantly impacts its motion and morphology, and these two effects are coupled with each other.
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来源期刊
Physics of Fluids
Physics of Fluids 物理-力学
CiteScore
6.50
自引率
41.30%
发文量
2063
审稿时长
2.6 months
期刊介绍: Physics of Fluids (PoF) is a preeminent journal devoted to publishing original theoretical, computational, and experimental contributions to the understanding of the dynamics of gases, liquids, and complex or multiphase fluids. Topics published in PoF are diverse and reflect the most important subjects in fluid dynamics, including, but not limited to: -Acoustics -Aerospace and aeronautical flow -Astrophysical flow -Biofluid mechanics -Cavitation and cavitating flows -Combustion flows -Complex fluids -Compressible flow -Computational fluid dynamics -Contact lines -Continuum mechanics -Convection -Cryogenic flow -Droplets -Electrical and magnetic effects in fluid flow -Foam, bubble, and film mechanics -Flow control -Flow instability and transition -Flow orientation and anisotropy -Flows with other transport phenomena -Flows with complex boundary conditions -Flow visualization -Fluid mechanics -Fluid physical properties -Fluid–structure interactions -Free surface flows -Geophysical flow -Interfacial flow -Knudsen flow -Laminar flow -Liquid crystals -Mathematics of fluids -Micro- and nanofluid mechanics -Mixing -Molecular theory -Nanofluidics -Particulate, multiphase, and granular flow -Processing flows -Relativistic fluid mechanics -Rotating flows -Shock wave phenomena -Soft matter -Stratified flows -Supercritical fluids -Superfluidity -Thermodynamics of flow systems -Transonic flow -Turbulent flow -Viscous and non-Newtonian flow -Viscoelasticity -Vortex dynamics -Waves
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