Thermo-electric characteristics analysis of thermionic energy conversion in space nuclear reactors

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS
Haocheng Zhao, Chenglong Wang, Suizheng Qiu, Wenxi Tian, Guanghui Su
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Abstract

Among static energy conversion technologies, thermionic energy converters have emerged as the preeminent choice for space nuclear reactor applications, distinguished by their high efficiency, compact architecture, and exceptional operational reliability. A comprehensive system analysis code, developed in C++, has been employed to integrate a thermionic electron emission model, an electric circuit model, and a thermionic conversion efficiency model. Through this code, thermionic characteristics for both single components and multiple components configured in series and parallel have been calculated, with validation indicating an error margin of less than 0.2 A/cm2. The performance characteristics of an individual thermionic fuel element have been rigorously evaluated, and comprehensive sensitivity analyses have been conducted on both emitter and collector temperatures. Under steady-state conditions, a maximum power output of 9.32 kW has been demonstrated by series-connected elements, while parallel-connected configurations have achieved 752 W. Notably, in scenarios involving the loss of a heat sink, it has been observed that maintaining the operating voltage of parallel-connected elements below a specific threshold during the incident results in enhanced power output, thereby facilitating core cooling. This study provides critical insights into the optimization of design and performance for thermionic energy conversion elements in space nuclear reactor applications.
空间核反应堆热离子能量转换的热电特性分析
在静态能量转换技术中,热电子能量转换器以其高效率、紧凑的结构和卓越的运行可靠性而成为空间核反应堆应用的最佳选择。用c++编写了一个综合系统分析代码,用于集成热离子电子发射模型、电路模型和热离子转换效率模型。通过这个代码,计算了单元件和多元件串联和并联配置的热离子特性,验证表明误差小于0.2 A/cm2。对单个热离子燃料元件的性能特性进行了严格的评估,并对发射极和集热器温度进行了综合敏感性分析。在稳态条件下,串联元件的最大输出功率为9.32 kW,并联元件的最大输出功率为752 W。值得注意的是,在涉及散热片损失的情况下,已经观察到在事故期间保持并联元件的工作电压低于特定阈值会导致功率输出增强,从而促进堆芯冷却。该研究为空间核反应堆应用中热电子能量转换元件的设计和性能优化提供了重要的见解。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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