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分析了电加热器对流动氦气的加热过程，从能量平衡和热传导的角度建立了系统数学模型，用解析的方法表达了热量的传递过程，得到了传递函数。用Matlab的Simulink模块搭建了PID的控制框架，用积分分离的策略改进了温度控制的效果。仿真结果显示流体在进口温度不断变化的情况下，通过加热器的功率调节获得了比较稳定的气体出口温度，表现出了良好的控制结果。

Simulation and analysis of the outlet temperature control of flowing helium gas

The heating process of flowing helium gas by the electric heater was analyzed. The system mathematical model was established from the perspective of energy balance. The PID control framework was adopted using Matlab Simulink module. To improve the effect of the temperature control, the PID control was optimized by the integral separation. Simulation results show that in the case where the fluid inlet temperatures change, a relatively stable gas outlet temperature is obtained by adjusting the heater power, and a good control is gotten.