超临界二氧化碳作为先进核能系统工质的热工流体力学关键基础问题研究

Supercritical carbon dioxide nuclear energy system is a new nuclear energy system concept, which could achieve a revolutionary breakthrough in nuclear energy technology. Based on the key hydrodynamic issues for the application of supercritical carbon dioxide in the advanced nuclear energy system, the authors use the methods of theoretical analysis, numerical simulation and experimental research to investigate the mechanism of the distinct changes of thermal properties near the pseudo-critical point, the effects of the sharp changes of thermal properties on the heat transfer of supercritical carbon dioxide, as well as the predict methods of heat transfer and flow instability boundary of supercritical carbon dioxide. The mechanism of the significant variations of thermal properties near the pseudo-critical point will be revealed, and a correlation model will be developed. The mechanism model of the effects of drastic changes of thermal properties on heat transfer of supercritical carbon dioxide will be put forward, and prediction models of heat transfer and flow instability boundary of supercritical carbon dioxide would be proposed. Results of present project could provide theoretical model, analytical method and experimental data for the research and design of supercritical carbon dioxide nuclear energy conversion system.

超临界二氧化碳先进核能系统是一种可望实现核能系统技术革命性、颠覆性突破的革新型核能系统概念。本项目采用理论分析、实验研究和数值计算相结合的方法，对超临界二氧化碳物性发生畸变的物理机理、物性畸变对超临界二氧化碳能量传递行为异化的影响机制、超临界二氧化碳能量传递特性和流动失稳预测方法等超临界二氧化碳应用于先进核能的关键基础科学问题开展研究，力图揭示拟临界区超临界二氧化碳物性畸变的物理机理，建立超临界二氧化碳物性畸变关联模型，获得拟临界区物性畸变诱发超临界二氧化碳能量传递行为异化的物理机制，构建全域范围内二氧化碳能量传递特性和流动失稳边界预测模型，为超临界二氧化碳先进核能系统的深入自主研发提供理论模型、分析方法和实验数据支撑。

本项目采用理论分析、实验研究和数值计算相结合的方法，对超临界二氧化碳物性发生畸变的物理机理、物性畸变对超临界二氧化碳能量传递行为异化的影响机制、超临界二氧化碳能量传递特性和流动失稳预测方法等超临界二氧化碳应用于先进核能的关键基础科学问题开展了综合研究。揭示了拟临界区超临界二氧化碳物性畸变的物理机理，建立了超临界二氧化碳物性畸变关联模型，获得了拟临界区物性畸变诱发超临界二氧化碳能量传递行为异化的物理机制，构建了全域范围内二氧化碳能量传递特性和流动失稳边界预测模型。本项目研究成果可为超临界二氧化碳先进核能系统的深入自主研发提供理论模型、分析方法和实验数据支撑。