熱離子能量轉(zhuǎn)換器中物理過(guò)程的分析
ANALYSIS OF THE PHYSICAL PROCESSES IN A THERMIONIC ENERGY CONVERTER
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摘要: 本文介紹了熱離子能量轉(zhuǎn)換器(簡(jiǎn)稱(chēng)TEC)的點(diǎn)火型工作狀態(tài)及其分析計(jì)算的物理模型,將電極之間分成五區(qū):即陰、陽(yáng)極鞘層,過(guò)渡區(qū)和中性等離子體區(qū);討論了TEC內(nèi)的電離機(jī)構(gòu),計(jì)算伏安特性和等離子體參量分布的方法,給出了國(guó)外數(shù)值計(jì)算的結(jié)果。 文章指出:TEC內(nèi)的電離主要決定于階梯電離;等離子體參量由一維電子和離子流輸運(yùn)方程、連續(xù)方程和能量輸運(yùn)方程來(lái)描述;電極附近的過(guò)渡區(qū)則作為邊界條件來(lái)處理。
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關(guān)鍵詞:
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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