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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 nodal model for the analysis of dynamic characteristics of alkali metal cooling space reactor system based on lumped parameter method was established. The program of dynamic characteristics analysis of space reactor system was developed by using Simulink software, and the program was validated by design parameters. The dynamic response characteristics of the system when the control drum angle and the external load resistance step change are analyzed. The results show that when the step change of the control drum angle introduces positive reactivity, the core power rises rapidly and then reaches a new steady state due to the negative feedback, but the output of the thermocouple (TE) power has a certain delay. When the external load resistance changes stepwise, the output of TE thermoelectric conversion power increases rapidly, causing the temperature of the hot end of TE to rise, the temperature of the core to rise, and the temperature of the core to drop due to negative feedback. Comparing the transient response of the two, the change of the external load resistance is more rapid than that of the change of the control drum angle, which causes the TE electric power output to respond.