Temperature measurement of gas flow with high temperature and speed using thermal video system

摘要

Abstract: Thermal imaging technique has been used to measure the temperature distribution of gas flow with high temperature and high speed generated in a high temperature wind-tunnel. FIrst, the silicon carbon sheath of thermocouple sensor was considered as a reverential body and its surface temperature was measured using a thermal-video system. The, the real temperature distribution of gas flow was calculated according to the convective heat transfer coefficient between the reverential body and the gas flow. Two ways have been sued to determine the convective heat transfer coefficient, one by calculating based on empirical relation, other by experimental way. !5