基于节点模型的空间堆系统动态特性分析

Development of A Nodal Model for Space Reactor System Dynamic Characteristics Analysis

建立集总参数法的碱金属冷却空间堆系统动态特性分析的节点模型,利用Simulink软件开发了空间堆系统动态特性分析程序,并利用设计参数对程序进行验证。分析了控制鼓转角和外部负载电阻阶跃变化时的系统动态响应特性。结果显示:在控制鼓角度阶跃变化引入正反应性时,堆芯功率迅速上升尔后由于负反馈而达到新的稳定状态,但热电偶(TE)电功率的输出有一定的延迟。在外部负载电阻阶跃变化时,TE热电转换电功率输出快速升高,使得TE热端温度升高,堆芯温度升高,由于负反应反馈导致堆芯温度下降。比较两者瞬态响应,外部负载电阻的变化较控制鼓角度的变化引起TE电功率输出的响应要快速。

A lumped parameter method nodal model is developed for alkali metal cooled space reactor system dynamic characteristics analysis in this paper. The space reactor system dynamic response code was built by using Simulink, and the code was approved with steady state designed parameters. The transient response of space reactor was studied on the step responses of the increase in the drum angle and external load. The results show that the power increased rapidly, and then the power increased slowly to a final new steady state because of the core reactivity temperature feedback. When increased in external load, the TE electric power output increased rapidly and a great negative reactivity was brought to the core, thus the core underwent a rapid power decrease and core fuel temperature decreased. The TE electric power output responds to the change in external load in a much faster spend than the change in control angle.