Title: Development of Local Gas Temperature Measurement Technique Inside a Combustion Chamber Using Two-Wire Thermocouple
Abstract: Thermocouples are widely used to measure gas temperature due to its accuracy and convenience. However, it is difficult to employ thermocouples in a transient phenomena such as reacting fields. In this study, the unsteady gas temperature inside a combustion chamber was measured by using an improved two-wire thermocouple technique. Based on previous two-wire methods, some modifications were examined. Firstly, numerical analysis of heat transfer between transient flow and thermocouple was performed to see what kind of modification is required. Secondly, a correction term was added to the basic equation, which was validated by experiments using RCEM. Finally, an improved two-wire thermocouple technique was evaluated by measuring the transient gas temperature inside a combustion chamber comparing to the estimated temperature using measured pressure data and assumptions such as chemical equilibrium to see the adaptability of this technique.