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首页> 外文期刊>Physics of plasmas >The role of radiative reabsorption on the electron energy distribution functions in H-2/He plasma expansion through a tapered nozzle
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The role of radiative reabsorption on the electron energy distribution functions in H-2/He plasma expansion through a tapered nozzle

机译：辐射重吸收对通过锥形喷嘴的H-2 / He等离子体膨胀中电子能量分布函数的作用

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A collisional-radiative model for the H-2/He plasma, coupled to a Boltzmann solver for the free electron kinetics is used to investigate the non-equilibrium conditions created in the expansion of an high-temperature plasma flow through a converging-diverging nozzle, starting from the steady state composition at T-0 = 10000 K and p(0) = 1 atm in the reservoir. It is shown that the plasma optical thickness plays a major role on the evolution of macroscopic quantities and internal distributions along the nozzle axis. Structured electron energy distribution functions, characterized by long plateaux and humps, are created due to superelastic collisions of cold electrons and electronically excited atomic hydrogen. The magnitudes of the plateaux are orders of magnitude higher in an optically thick plasma compared with a thin plasma, while the electron-electron collisions play a role in smoothing the peaks created by superelastic collisions between cold electrons and H(n > 2). (C) 2014 AIP Publishing LLC.
机译：使用H-2 / He等离子体的碰撞辐射模型，结合用于自由电子动力学的玻尔兹曼解算器，研究高温等离子体流通过会聚-发散喷嘴膨胀时产生的非平衡条件从储层中T-0 = 10000 K和p（0）= 1 atm的稳态组成开始。结果表明，等离子光学厚度在沿喷嘴轴的宏观量和内部分布的演变中起主要作用。由于冷电子和电子激发的原子氢的超弹性碰撞，产生了结构化的电子能量分布函数，其特征是平稳和驼峰长。与薄等离子体相比，光学厚度的等离子体中平台的幅度要高几个数量级，而电子与电子的碰撞起着平滑由冷电子与H（n> 2）之间的超弹性碰撞产生的峰的作用。 （C）2014 AIP Publishing LLC。

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