核热推进系统分析程序模型与计算方法初步研究  

Preliminary Research on Model and Computational Method of System Analysis Program in Nuclear Thermal Propulsion

作　　者：毛晨瑞 吉宇 孙俊[1] 郎明刚 石磊[1] MAO Chenrui;JI Yu;SUN Jun;LANG Minggang;SHI Lei(Institute of Nuclear and New Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学核能与新能源技术研究院,先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《原子能科学技术》2024年第3期680-688,共9页Atomic Energy Science and Technology

基　　金：国家自然科学基金(52106256)。

摘　　要：核热推进(NTP)系统具有高比冲、大推力和工作时间长等特点,在深空探测和轨道机动等方面具有明显的优势。系统性能分析是NTP系统研发与设计的重要内容。结合对国际历史上已开发程序的分析以及现阶段的研发需求,将系统性能分析划分为稳态设计点性能分析与优化、稳态非设计点性能分析以及瞬态性能分析3个主要环节。在清华大学核能与新能源技术研究院自主开发的核动力发动机系统分析程序PANES基础上,提出了基于“流网-热网”的系统分析程序框架,并建立了反应堆中子动力学与涡轮泵动态特性等数学模型,提出了对应的计算分析方法,拓展了原程序的功能。该工作为NTP系统设计方法的进一步研究和应用提供了重要基础。The nuclear thermal propulsion(NTP)boasts advantages such as high specific impulse,substantial thrust,and extended operating time,giving it a clear edge in deep space exploration and orbital maneuvers.To fully harness the potential of NTP,a comprehensive system performance analysis is crucial to ensure reliability and efficiency under various operational conditions.This study provided an overview of the historical development and current status of nuclear thermal propulsion system analysis programs,both nationally and internationally.It also conducted an in-depth analysis of programs utilized in projects such as NERVA and SNTP.Building on an examination of historical international program advancements and current research requirements,system performance analysis is categorized into three primary components:steady-state performance design and optimization,steady-state off-design performance analysis,and transient performance analysis.Based on the independently developed program for analyzing nuclear engine systems(PANES)at Institute of Nuclear and New Energy Technology,Tsinghua University,an integrated NTP system analysis program framework based on“flow network-heat network”was proposed.The one-dimensional flow network model employed a concept similar to the staggered grid commonly used in computational fluid dynamics(CFD).It separately handled the momentum conservation equation in the resistance/inertia segment and the continuity and energy conservation equations in the capacitance segment.The thermal network model was solved based on the solid energy equation considering heat capacity.Coupled calculations of the thermal network and flow network were achieved by considering heat exchange in the capacitance segment of the flow network.Specifically,a point reactor model based on backward Euler(BE)or Crank-Nicolson(CN)time discretization formats was established to facilitate the calculation of power produce processes.To enhance the understanding and optimization of turbine performance,a turbine model was develop

关 键 词：核热推进 系统性能分析 程序开发 点堆模型 涡轮泵 

分 类 号：TL413.3[核科学技术—核技术及应用] V439.5[航空宇航科学与技术—航空宇航推进理论与工程]