Research on temperature measurement simulation experiment based on infrared thermal image

Abstract

Because of the influence of extreme environment such as high temperature, high pressure, high speed and high impact, it is difficult to measure the transient high temperature of high temperature flame in the explosion field accurately. This kind of transient temperature measurement is often accompanied by high pressure or high speed air flow, most of which are non repeatable one-time processes. Therefore, poor measurement conditions, high technical difficulty and inaccurate temperature measurement are all problems that can not be ignored. At the same time, there are high requirements for the reliability and data acquisition rate of the system. In this paper, we use the alcohol burner to operate in the laboratory, use the infrared thermal imager to collect the temperature of the nozzle after the alcohol is fully burned, adjust the flame emissivity and collect the temperature of the flame, and export the collected flame pictures for data analysis. By using modern simulation software, combining hydrodynamics and software simulation, the turbulent k-e model is applied to simulate the single nozzle high temperature flame through the material transfer and fluid heat transfer in the combustion process. Comparing the simulation results with the experimental data, it can be seen that the simulation results well reproduce the experimental parameters such as the velocity and pressure of the nozzle and the temperature of the exit flame, including the mass fraction of each material after combustion, which is roughly similar to the temperature field collected by the infrared thermal imager, providing an efficient and more accurate verification means for the detection and reconstruction of multiple temperature fields in the future.