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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >EXPERIMENTAL STUDIES ON ATMOSPHERIC PRESSURE GLOW DISCHARGE FOR DRAG REDUCTION AND MICROWAVE INVISIBILITY
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EXPERIMENTAL STUDIES ON ATMOSPHERIC PRESSURE GLOW DISCHARGE FOR DRAG REDUCTION AND MICROWAVE INVISIBILITY

机译：大气压力辉光排放对减阻和微波不可见性的实验研究

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Absorption and reflection of microwaves from plasma with electron density gradients and reduction of frictional drag force on moving aircrafts are the important issues of atmospheric pressure plasma applications. For these purposes several thermal and non-thermal plasma sources have been developed that work near atmospheric pressure. The characterization of these plasmas has also been done by many researchers using mostly spectroscopic techniques. The Langmuir probe diagnostic, inspite of its theoretical limitation at high collisional regime, has also been reported in many experiments to characterize high-pressure plasmas. We are reporting the comparison of two diagnostic techniques i.e. Langmuir probe and emission spectroscopy for atmospheric pressure glow discharge plasma in helium. For the measurement of plasma parameters, ramped probe Ⅰ-Ⅴ characteristics curves were used for probe diagnostics and line intensity ratios were used for spectroscopic diagnostics. An attempt has been made to crosscheck the measurements using different techniques for their validation. The variation of the plasma parameters i.e. electron density and temperature with external tunable parameters viz. applied voltage and frequency is also investigated to find the scaling of plasma parameters with external controls. Estimated electron density is ～10~(11) cm~(-3) and electron temperature is ～10 eV. Measured plasma parameters indicate suitability of the plasma which can be exploited for microwave invisibility.
机译：具有电子密度梯度的等离子体对微波的吸收和反射以及移动飞机上摩擦阻力的减小是大气压等离子体应用的重要问题。为了这些目的，已经开发了几种在大气压附近工作的热和非热等离子体源。许多研究人员还主要使用光谱技术对这些血浆进行了表征。尽管Langmuir探针诊断法在高碰撞条件下具有理论上的局限性，但在许多实验中也已报道了该法对高压等离子体进行表征。我们报告了两种诊断技术的比较，即Langmuir探针和发射光谱法用于氦气中的大气压辉光放电等离子体。对于血浆参数的测量，使用倾斜的探针Ⅰ-Ⅴ特性曲线进行探针诊断，并使用线强度比进行光谱诊断。尝试使用不同技术对测量进行交叉检查以进行验证。等离子体参数的变化，即电子密度和温度随外部可调参数的变化。还研究了施加的电压和频率，以通过外部控制找到等离子体参数的比例。估计电子密度为〜10〜（11）cm〜（-3），电子温度为〜10 eV。测得的等离子体参数表明等离子体的适用性，可将其用于微波隐身。

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