液氮重力自循环系统的仿真及设计  

Method of Designing Natural Circulation Loops of Liquid Nitrogen

作　　者：高天 王安良[1] GAO Tian;WANG Anliang(School of Astronautics of Beihang University, Beijing 100191, China)

机构地区：[1]北京航空航天大学宇航学院,北京100191

出　　处：《兵器装备工程学报》2018年第4期183-188,共6页Journal of Ordnance Equipment Engineering

摘　　要：基于自然对流沸腾和两相流压降特性的耦合原理,建立了一个用于设计液氮重力自循环热沉系统的方法。在给定热流密度、结构特征尺寸、入口温度以及外壁面温度等条件下,编写了系统仿真程序,将仿真结果与文献中的实验数据进行了对比分析,仿真结果与实验数据吻合较好。研究结果表明结构参数与环境压强对系统内流动特性有着重要影响。该方法可为液氮热沉系统的设计提供有价值的参考。A simple method for designing a natural circulation loop of liquid nitrogen was proposed. Basing on the coupling principle of heat transfer of natural convection boiling and pressure drop of two-phase flow,a mathematical model was established to derive flow and heat transfer characteristics in the natural circulation loop. The simulation results show a good agreement with Baudouy ＇s experimental data. The authors indicate that both structural parameters and ambient pressure influence flow characteristics in the system. This method provides a valuable tool for designing new cryogenic natural circulation loops of liquid nitrogen.

关 键 词：液氮 重力自循环系统 气液两相流 系统仿真 

分 类 号：TB661[一般工业技术—制冷工程]