热离子能量转换器中物理过程的分析
ANALYSIS OF THE PHYSICAL PROCESSES IN A THERMIONIC ENERGY CONVERTER
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摘要: 本文介绍了热离子能量转换器(简称TEC)的点火型工作状态及其分析计算的物理模型,将电极之间分成五区:即阴、阳极鞘层,过渡区和中性等离子体区;讨论了TEC内的电离机构,计算伏安特性和等离子体参量分布的方法,给出了国外数值计算的结果。 文章指出:TEC内的电离主要决定于阶梯电离;等离子体参量由一维电子和离子流输运方程、连续方程和能量输运方程来描述;电极附近的过渡区则作为边界条件来处理。
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Abstract: An investigation of the working state of the ignition type thermionie energy con-verter (TEC) is carried out and a physical model is established for analysis and calcu-lation. The region between the positive and the negative electrodes is divided into five sub-regions: Positive and negative sheathes, positive and negative transition sub-regions and a neutral plasma sub-region. An analytical study of the ionization mechanism in the TEC, a calculation of voltage-current characteristic and the distribution of plasma parameters between electrodes are described from a physical point of view. It is shown that ionization in the TEC is mainly determined by the step-type ionization. Plasma parameteres are characterized by means of the one-dimensional electron flow and ion flow transport equation, the continuity equation and the energy transfer equation, while the complicated transition regions near the electrodes are considered as boundary conditions as an approximation. The theoretical analysis and numerical calculations indicate that this analytical method is applicable. -
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