火箭推进

为了保证闭式布雷顿循环核心机在空间核电推进系统内能够稳定运行,需要在其调控过程中同时控制多个系统变量参数,设定合适的初始状态和调控策略。通过对整个闭式布雷顿循环的系统仿真,模拟了不同初始压力的情况下核心机在升速加载过程中的系统参数变化情况。在核心机转速与反应堆加热协同配合的调控策略下,压气机在整个升速加载过程中可以始终处于稳定运行区间内,而循环系统的初始压力会影响核心机加载过程中的各项参数,尤其是涡轮入口温度。在相对较低的系统初始压力情况下,需要在更高的涡轮入口温度条件下,才能够达到与高初始压力情况下相同的满状态电功率输出。仿真结果验证了以精确转速控制作为运行标准的核心机调控策略可行性,同时可以为循环系统不同阶段的热试车试验提供指导建议。

To ensure that the core machine in the closed Brayton cycle can operate stably in the space nuclear power propulsion system,it is necessary to control multiple system variables at the same time during its regulation process,and set appropriate initial states and control strategies. Through the system simulation of the entire closed Brayton cycle,the system parameter changes of the core machine during the speed-up loading process are simulated under different initial pressures. Under the control strategy of the core engine rotational speed cooperated with the reactor heating,the compressor can always be in a stable operation range during the entire speed-up loading process. The initial pressure of the circulation system will affect various parameters during the loading process of the core engine,especially the turbine inlet temperature. In the case of a relatively low system initial pressure,a higher turbine inlet temperature is required to achieve the same full-state electrical power output as that under a high initial pressure condition. The simulation results verify the feasibility of the core machine adjustment strategy with precise speed control as the operating standard. Meanwhile,these can provide guidance and suggestions for the hot commissioning test of the circulatory system at different stages.

引言
1 计算模型
2 核心机升速启动过程系统仿真
3 结论

图1 JIMO额定发电功率为100 kW的闭式布雷顿循环系统参数<br/>Fig.1 Parameters of the closed Brayton cycle system with a rated power generation of 100 kW in the JIMO plan

图1 JIMO额定发电功率为100 kW的闭式布雷顿循环系统参数
Fig.1 Parameters of the closed Brayton cycle system with a rated power generation of 100 kW in the JIMO plan

图2 叶轮机械全工况范围性能曲线<br/>Fig.2 Performance curve of turbomachinery in full operating range

图2 叶轮机械全工况范围性能曲线
Fig.2 Performance curve of turbomachinery in full operating range

图3 启发一体式电机的电压-扭矩线<br/>Fig.3 Voltage-torque line of inspired integrated motor

图3 启发一体式电机的电压-扭矩线
Fig.3 Voltage-torque line of inspired integrated motor

图4 闭式布雷顿循环系统模型<br/>Fig.4 System model of closed Brayton cycle

图4 闭式布雷顿循环系统模型
Fig.4 System model of closed Brayton cycle

图5 系统容积组成<br/>Fig.5 Composition of system volume

图5 系统容积组成
Fig.5 Composition of system volume

图6 核心机启动和升速加载过程控制逻辑<br/>Fig.6 Control logic of core machine during startup and speed-up loading process

图6 核心机启动和升速加载过程控制逻辑
Fig.6 Control logic of core machine during startup and speed-up loading process

图7 初始压力为400 kPa核心机升速加载过程中系统参数变化情况<br/>Fig.7 System parameters during startup process of core machine with initial pressure of 400 kPa

图7 初始压力为400 kPa核心机升速加载过程中系统参数变化情况
Fig.7 System parameters during startup process of core machine with initial pressure of 400 kPa

图8 初始压力为400 kPa核心机升速加载过程中组件参数变化情况<br/>Fig.8 Component parameters during startup process of core machine with initial pressure of 400 kPa

图8 初始压力为400 kPa核心机升速加载过程中组件参数变化情况
Fig.8 Component parameters during startup process of core machine with initial pressure of 400 kPa

表1 不同初始压力下满状态下循环系统和组件部分重要参数<br/>Tab.1 Key parameters of circulatory system and components in full state with different initial pressures

表1 不同初始压力下满状态下循环系统和组件部分重要参数
Tab.1 Key parameters of circulatory system and components in full state with different initial pressures

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备注

引言

1 计算模型

2 核心机升速启动过程系统仿真

3 结论

期刊信息