Dynamic Compensation Method for Temperature Measurement Error of High Temperature and High-speed Airflow

Aiming at the simulation requirements of airflow temperature signal for the total temperature simulation device of hypersonic aircraft, an airflow temperature simulation system is designed. The system consists of a high-temperature plasma spray gun, an airflow mixing chamber, and a thermocouple. The maximal temperature of the system is high and the temperature changes rapidly. But the thermocouple responds slowly, hence there is a large error when measuring the airflow temperature. However, the accuracy of airflow temperature measurement results is important to improve the accuracy of airflow temperature simulation signals. In order to improve the accuracy of airflow temperature measurement and reduce the measurement dynamic error. Based on the analysis and research of the airflow temperature signal simulation system, this paper adopts double thermocouples to measure the airflow temperature, and proposes a time domain compensation method to compensate the airflow temperature measurement results. Experimental results show that the double thermocouple compensation method can reduce the measurement error effectively.