Generation of Lambda Shaped Flow Region in Laminar Gas Jet Induced by Plasma Propagation

IF 2.2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2026-06-16 DOI:10.1007/s10494-026-00766-8

Asma Begum, Tatsuo Ishijima, M. R. Pervez, Mohammed Anwer

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引用次数: 0

Abstract

Atmospheric Pressure Plasma Jet (APPJ) accelerating following the fluid flow is responsible for the modification of the gas flow dynamics. This study investigates the gas flow dynamics in the presence of non-thermal atmospheric pressure plasma jets (APPJs), focusing on the Greek letter lambda shape transition region between laminar and vortex flow regimes. Using Schlieren imaging, we analyzed flow characteristics at different gas flow rates (2 slm, 3 slm, and 4 slm), identified distinct flow regions and the onset of vortex. A small to moderate flow instability around plasma jet is observed. Key parameters, including Reynolds number, electron density, electron drift velocity (~10⁵ m/s) and electrohydrodynamic (EHD) forces, are evaluated experimentally to understand their roles in flow instability. Electron and gas temperature estimated from emission data are ~3500 K and ~350 K, respectively. The plasma jet extends past the 50% air admixture on the helium channel, resulting in a lambda-shaped flow. Additionally, variations in the electric field contribute to the instability of the plasma jet is justified.

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等离子体传播诱导层流气体射流中λ形流区的产生

大气压等离子体射流（APPJ）随流体流动而加速是引起气体流动动力学变化的主要原因。本研究研究了非热大气压等离子体射流（APPJs）存在下的气体流动动力学，重点研究了层流和涡旋流之间的希腊字母λ形状过渡区。利用纹影成像技术，我们分析了不同气体流速（2、3、4 slm）下的流动特性，确定了不同的流动区域和旋涡的发生。在等离子体射流周围观察到小到中等的流动不稳定性。实验评估了雷诺数、电子密度、电子漂移速度（~105 m/s）和电流体动力（EHD）等关键参数，以了解它们在流动不稳定性中的作用。发射数据估计的电子温度和气体温度分别为~ 3500k和~ 350k。等离子体射流在氦通道上延伸超过50%的空气混合物，形成λ形流。此外，电场的变化有助于等离子体射流的不稳定性是合理的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.