Stagnation Point Heat Flux Measurement in the Shock Tube using Coaxial Surface Junction Thermocouple

摘要

In this paper, it is planned to estimate the stagnation point heat flux in the shock tube using a coaxial surface junction thermocouple (CSJT) on a hemispherical model. For the present study, an E-type (chromel-constantan) CSJT is chosen. The sensor is designed fabricated and calibrated in-house to measure the stagnation point heat flux on the surface of a hemispherical model in the shock tube-IITG. The sensor has been flush mounted on the model of radius 10 mm fitted at the end flange of the shock tube. The results obtained have shown satisfactory trend. The sensor has a response time of few microseconds. The idea behind the work is to check whether the in-house fabricated sensor works in the harsh environment such as that of shock tube. The fabricated sensor is rugged, robust and inexpensive.