论文标题
在固定热输入下，在微间隙热能转换器中，近场辐射耦合和空间电荷效应之间的相互作用
Interplay Between Near-Field Radiative Coupling and Space Charge Effects in a Micro gap Thermionic Energy Converter under Fixed Heat Input
论文作者
论文摘要
我们研究了由于空间电荷效应和电性辐射热传热而导致的损耗机制的微间隙真空热能转换器的性能。空间电荷效应的依赖性和近场辐射热交换对互距离距离的依赖性是基于既定理论得出的。电极温度是通过在数值，迭代过程中求解稳态能量平衡方程来确定的，并考虑对发射极的恒定能量输入。研究了来自电极的各种能量流的不同机制的最终行为，以进行各种电极距离，从而为设备操作提供了新的见解。通过优化工作电压和互电极距离，可以获得转换器的最大效率。考虑到空间电荷和近场辐射传热之间的相互作用，确定了电极距离的最佳范围。发现该范围的距离和下限的最佳值明显高于先前报道的恒定电极温度。
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.
