平板型电极对热离子能量转换特性的测试技术研究  

Research on Testing Technology for Thermionic Energy Conversion Characteristics of Flat Electrode Pair

作　　者：马茹 金睿 么斯雨 任思琪 齐立君[1] 钟武烨 MA Ru;JIN Rui;YAO Siyu;REN Siqi;QI Lijun;ZHONG Wuye(Reactor Engineering Technology Research Institute,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院反应堆工程技术研究所,北京102413

出　　处：《原子能科学技术》2024年第4期887-895,共9页Atomic Energy Science and Technology

基　　金：中核集团“青年英才”项目(219602)。

摘　　要：为开展热离子能量转换器基础性能数据的研究,基于平板型电极热离子能量转换基础试验装置建立了针对电极对热电转换特性的测试技术,通过开展W-Mo电极对的热离子发电测试,对所建立的测试技术进行了验证及评价,并分析了热离子发电参数对输出特性的影响规律。结果表明:所建立的测试技术可准确测量发射极有效功函数值;利用热离子基础试验装置测得的W-Mo电极对的最大输出功率密度为5.6 W/cm^(2),对应的发电参数为发射极温度1800 K,铯壶温度577 K,输出电压0.7 V。The thermionic energy converter is a static thermoelectric conversion device,which is the core component of the thermionic nuclear reactor.To improve the conversion efficiency of thermionic energy converters,it is necessary to test its basic performance and conduct research on the optimization mechanism of its thermoelectric performance.At present,a basic experimental device of thermionic energy converter with the flat electrode pair has been developed in China,which can be used to achieve isothermal equipotential of electrodes during the power generation experiments.However,the corresponding analysis method of thermoelectric characteristic of electrodes has not yet been established,so it is urgent to set up a reasonable testing technology for the analysis of the basic thermionic performance.By drawing inspiration from the theory and empirical formula of thermionic energy conversion,and combining with the test data of voltammetry characteristics obtained in experiments,a specialized testing technology for the thermoelectric conversion characteristics of flat electrode pair was established.Then,the tests of thermoelectric conversion of W-Mo electrode pair with the basic experimental device was conducted.The established testing technology was validated and evaluated by comparing the values of the effective work function of the tungsten emitter tested in the experimental device with the theoretical and experimental values in the literature.And the results show that the measured values of the effective work function of the emitter in this study are consistent with those in the literature,indicating that the established testing technology was accurate and reasonable.Therefore,it can be asserted that this testing technology can be used to analyze the output electrical characteristics of a flat electrode type thermionic energy conversion device.What’s more,the thermoelectric conversion performance of W-Mo electrode pairs was further studied using this testing technique.The influence of power generation parameters,incl

关 键 词：热离子能量转换 测试技术 平板型电极 发射极 输出功率密度 

分 类 号：TL35[核科学技术—核技术及应用]