气体流速对增强型射频交叉场大气压等离子体射流中气体温度调控的影响
Gas Flow Rate Influence on Gas Temperature Regulation in a Reinforced Radio-Frequency Cross-Field Atmospheric Plasma Jet
AI总结：
本研究探究带附加悬浮电极的增强型射频交叉场大气压等离子体射流中气体流速对气体温度的影响，发现流速提升可降低气体温度，但过高流速会因输入功率不足削弱电离，需同步调控流速与输入功率以优化性能。
AI中文摘要：
本研究探究了带有附加悬浮电极的增强型射频交叉场大气压等离子体射流（APPJ）中，气体流速对气体温度及放电特性的影响。通过引入不同宽度的铜悬浮电极，等离子体射流长度、电子激发温度、电子密度及反应性均得到增强，但伴随出现了气体温度的不期望升高，限制了该等离子体在热敏感材料领域的应用。为控制该温度升高，气体流速在1.5至9升每分钟（lpm）范围内变化，结果显示随着流速增加，气体温度从438开尔文（K）显著降至402 K，且在较高输入功率下该趋势尤为明显。研究表明，气体流速提升初期可通过提高电子激发温度与密度增强电离及反应性，但当流速较高时，输入功率不足以维持电离所需，电离效率下降导致上述参数降低；通过增加输入功率可实现进一步优化，即使在较高流速下也能更好地利用中性原子，提升等离子体反应性。研究结果强调，调节气体流速与输入功率对维持不同应用场景下的最优等离子体性能至关重要，尤其在需要控制气体温度且要求高反应性的场合。
英文摘要：
This study investigates the effect of gas flow rate on the gas temperature and discharge characteristics of a reinforced radio frequency cross-field atmospheric pressure plasma jet (APPJ) with an additional floating electrode. The plasma jet length, electron excitation temperature, electron density, and reactivity were enhanced by introducing copper floating electrodes of varying widths. However, this enhancement was accompanied by an undesired rise in gas temperature, limiting the plasma's application for heat- sensitive materials. To control this temperature rise, the gas flow rate varied from 1.5 to 9 lpm, showing a significant reduction in gas temperature from 438 K to 402 K as the flow rate increased, particularly at higher input powers. The study reveals that while an increase in gas flow rate initially improves ionization and reactivity by increasing electron excitation temperature and density, the insufficient input power for ionization at higher flow rates causes a decline in these parameters due to reduced ionization efficiency. Further optimization was achieved by increasing input power, which allowed better utilization of neutral atoms and improved plasma reactivity even at higher flow rates. The findings highlight the importance of tuning both gas flow rate and input power to maintain optimal plasma performance for various applications, particularly where controlled gas temperature and high reactivity are essential.
