固定热输入下微间隙热离子换能器中近场辐射耦合与空间电荷效应的相互作用
Interplay Between Near-Field Radiative Coupling and Space Charge Effects in a Micro gap Thermionic Energy Converter under Fixed Heat Input
摘要：
本文研究了微间隙真空电子换能器的性能，考虑了空间电荷效应和极间辐射换热的损耗机制。基于已有的理论推导了空间电荷效应和近场辐射换热对极间距离的依赖关系。电极温度通过在数值迭代过程中求解稳态能量平衡方程并考虑输入到发射器的恒定能量通量来确定。从电极的能量流的不同机制的所得行为进行了研究，为广泛的电极间的距离，这提供了新的见解到设备的操作。通过优化工作电压和极间距离，获得了变换器的最大效率。考虑到空间电荷与近场辐射换热的相互影响，确定了极间距离的最佳范围。的最佳值的距离和下限的范围被发现是显着高于以前报道的，其中恒定的电极温度已被假定。
英文摘要：
We investigate the performance of a micro gap vacuum thermionic energy converter considering the loss mechanisms due to the space charge effect and interelectrode radiative heat transfer. The dependencies of the space charge effect and near-field radiative heat exchange on the interelectrode distance are derived based on established theories. The electrode temperatures are determined by solving the steady-state energy balance equations in a numerical, iterative process and considering a constant energy flux input to the emitter. The resultant behaviour of the different mechanisms of energy flow from the electrodes is studied for a wide range of interelectrode distances, which provides new insights into the device operation. The maximum efficiency of the converter is obtained by optimizing the operating voltage and interelectrode distance. Considering the interplay between space charge and near-field radiative heat transfer, an optimal range is determined for the interelectrode distance. The optimal value of the distance and the lower limit of this range are found to be significantly higher than previously reported, where constant electrode temperatures had been assumed.
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