脉冲加热条件下垂直上升管内流动不稳定性研究  

Investigation of Flow Instability in Vertical Single Channel Under the Pulse Heating Condition

作　　者：郭斯茂 郭玉川 王冠博[1] 米向秒[1] 钱达志[1] 余恒 胡泊 GUO Si-Mao;GUO Yu-Chuan;WANG Guan-Bo;QIAN Da-Zhi;YU Heng;HU Bo(Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, China)

机构地区：[1]中国工程物理研究院核物理与化学研究所

出　　处：《工程热物理学报》2019年第6期1313-1318,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金青年基金项目(No.11605173)

摘　　要：脉冲释能是未来基于惯性约束聚变或聚变-裂变混合堆能源系统的固有特性,掌握脉冲加热条件下冷却剂流动不稳定基本特性及其关键影响因素,对新型脉冲能源系统的发展有着重要意义。本文对脉冲加热条件下的垂直上升管内流动不稳定进行了建模与数值模拟研究。研究结果表明随着脉冲热负荷的增加,管内会依次发生三种不同的流量脉动或流动不稳定现象,分别为过冷流动条件下微幅脉动、饱和蒸汽两相流动密度波不稳定以及出口过热条件下复合不稳定。研究还揭示了脉冲加热功率、脉冲周期、占空比等脉冲热负荷特征参数对三种流动不稳定现象的影响规律。本研究对脉冲能源系统热工水力设计具有指导意义。Pulse heating is an inherent characteristic of energy systems based on inertial confinement fusion or fusion-fission hybrid reactors in the future. It is of great significance for the development of this new type of pulsed heating energy system to understand the basic characteristics and key influencing factors of the coolant flow instability under the pulse heating condition. In this paper, the flow instability in a vertical single channel tube under pulse heating is simulated. Results indicate that three different cases of flow pulsation or flow instability phenomenon will occur with the increase of heating power. According to the characteristics of the flow instabilities, it can be divided into slightly flow instability under subcooled condition, density wave flow instability under two-phase flow condition and mixed flow instability under superheated condition. Meanwhile, the influences of pulse heating power, heating cycle and duty ratio on flow instability are also discussed. The results have guiding significance for thermal-hydraulic design in pulse heating energy system.

关 键 词：脉冲加热 数值模拟 流动不稳定 

分 类 号：TK17[动力工程及工程热物理—热能工程]