Analysis of Two Calculation Methods of Heat Flux Based on Slug Calorimeter

Abstract

The temperature of plasma jet is difficult to be measured directly because of its high temperature. The heat flux is often used to measure the thermodynamic properties of plasma jet and high temperature flow field. In this paper, two methods of heat flux calculation using slug calorimeter in plasma jet flow field are analyzed. One calculation method is based on one dimensional thermodynamic equation, ignoring the heat loss in the measurement process, called the noloss calculation equation; the other calculation method is to subtract the heat loss from the noloss method. This paper uses numerical simulation and experimental methods to verify the accuracy of the two heat flux calculation equations. The heat flux value is calculated according to the measured data, and the temperature curve is calculated in reverse from the calculated heat flux value. Finally, the calculated temperature curve is compared with the measured temperature curve. The temperature curve with loss heat flux is more consistent with the measured temperature curve. The loss calculation equation can obtain a more accurate heat flux value than the noloss calculation equation, and the error between the two is within 10%. The loss equation is calculated accurately, but it is difficult to give real-time results. There is an error in the noloss equation, but the calculation is simple and gives real-time results.