研究目的
Investigating the influence of plasma jets on a helium flow into open air, particularly focusing on the reduction in the length of the laminar zone of the helium flow caused by plasma ignition.
研究成果
The ignition of the plasma jet causes a significant decrease in the length of the laminar zone of the helium flow for low Reynolds numbers. This effect is less pronounced at higher Reynolds numbers. The findings suggest that plasma jets can influence the hydrodynamic properties of gas flows, which may have implications for biomedical applications.
研究不足
The study is limited to helium flows at specific Reynolds numbers and does not explore the effects of other gases or flow conditions. The influence of the electrode on the laminarity of the helium flow is not considered.
1：Experimental Design and Method Selection:
The study uses a microdischarge configuration with a helium jet impinging on open air at atmospheric pressure. Schlieren imaging is employed to visualize the helium flow.
2：Sample Selection and Data Sources:
Helium flow rates are varied to achieve different Reynolds numbers.
3：List of Experimental Equipment and Materials:
A dielectric tube with an inner diameter of
4：35 mm, a hollow electrode (6-mm inner diameter), and a high-voltage power supply (5 kV, 20 kHz, ~100 ns rise time, and ~250 ns pulse width) are used. Experimental Procedures and Operational Workflow:
Helium is flowed through the dielectric tube, and a plasma is initiated by applying a positive voltage to the electrode. Schlieren images are taken with and without plasma ignition.
5：Data Analysis Methods:
The transition point from laminar to turbulent flow is identified from the Schlieren images.
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