多级压缩布雷顿循环的核电推进系统概念设计

1. 哈尔滨工业大学 能源科学与工程学院,黑龙江 哈尔滨 150001; 2. 中国核动力研究设计院,四川 成都 610213

多级压缩; 布雷顿循环; 二元混合气体; 敏感性分析; Sobol-Sequence

Conceptual design of a nuclear-powered propulsion system utilizing a multi-stage compression Brayton cycle
LI Keyi1, YOU Ersheng2, ZHOU Ziyang1, ZHANG Haochun1

1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 2. China Nuclear Power Research and Design Institute, Chengdu 610213, China

multi-stage compression; Brayton cycle; binary gas mixture; sensitivity analysis; Sobol-Sequence

备注

针对空间核动力在深空探测领域的应用和需要,在简单回热式布雷顿循环的基础上,通过增加压气机的级数来提升系统的效率并降低对于压气机的性能要求,提高其可靠程度。通过建立氦氙物性模型和循环热力学模型,通过基于Sobol方法的敏感性分析方式,研究了循环关键节点温度、叶轮机械效率、压气机压比等参数对循环热效率和比质量的影响,并基于多目标粒子群算法进行了多目标优化获得系统关键性能参数的帕累托解集。计算结果表明:在相同的参数条件下多级压缩布雷顿循环热效率为22.33%,优于单级压气机的布雷顿循环17.75%的热效率。增加压气机的级数有效提高了系统的净效率,降低了对压气机的负荷,为高效空间核动力系统设计提供了理论依据。
Regarding the application and necessity of space nuclear power in deep space exploration, the system efficiency can be enhanced and the performance requirements for the compressor can be reduced by increasing the number of compressor stages on the basis of a simple regenerative Brayton cycle, thereby its reliability is improved. By establishing a helium-xenon property model and a thermodynamic cycle model, and conducting a sensitivity analysis based on the Sobol method, the impact of parameters such as the temperature at key cycle nodes, turbomachinery efficiency, and compressor pressure ratio on cycle thermal efficiency and specific mass was studied. In addition, a multi-objective optimization using a multi-objective particle swarm algorithm was performed to obtain the Pareto set of key performance parameters for the system. The results indicate that under identical parameter conditions, the thermal efficiency of the multi-stage compression Brayton cycle is 22.33%, which is superior to the 17.75% thermal efficiency of the single-stage compressor Brayton cycle. Increasing the number of compressor stages effectively improves the net efficiency of the system, the load on the compressor is reduced, and a theoretical basis is provided for the design of efficient space nuclear power systems.
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