Design and implementation of gas temperature control system of heat-calibration wind tunnel

This paper deals with the design and implementation of the hot-gas temperature control system in heat-calibration wind tunnel. According to the control requirements for gas temperature of the heat-calibration wind tunnel, a fuel supply system based on variable frequency control technology and proportional throttle valve is designed. In order to improve the level of automation of the control system, a computer control system which consists of PLC and industrial personal computer is designed. On this basis, the dynamic characteristics of the system are analyzed, and the mathematical model of the system is established. Addressing the characteristics of the system, a DMC-PID cascade control law is used to achieve a precise control of the gas temperature of the heat-calibration wind tunnel.