Shizhong Zhang , Jinping Li , Hong Chen , Xiaoyuan Zhang , Hongru Yu
DOI Number XXX-YYY-ZZZ
Conference Number HiSST 2018_43101169
The accurate prediction of aerodynamic heating environment can effectively reduce the margin of thermal design and increase the payload, while the ground wind tunnel experiment is an important means to predict the aerodynamic heating environment. The existing transient heat flux sensors in hypersonic ground wind tunnel experiment include thin film thermometer and coaxial thermocouple. The former has high sensitivity, but it is not suitable for occasions where airflow is severely damaged; the latter is resistant to erosion, but the sensitivity is low, and the response characteristic is susceptible to the fine structure of the nodes, therefore it is only suitable for high heat flux measurement. In order to improve the accuracy of aerodynamic heating measurement, new heat flux measurement methods should be continuously developed. This paper presents a novel transient calorimetric heat flux sensor using diamond chips to replace the commonly used copper pieces as the calorimetric sheet. The temperature on back side of the calorimeter is measured by a thin film thermometer, which can greatly improves the output sensitivity of the calorimeter. The sensor design and selection of characteristic parameters is with the help of theoretical analysis and numerical calculation. The fabricated sensors have high linearity with temperature. The experimental results show that the repeatability error of the transient calorimetric heat flux sensor is within 4% and the error of measurement accuracy is within 6%. The sensor resistance keeps unchanged in the multitested and the measurement result is accurate and reliable.