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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

A visualization experiment on the thermal structure of non-equilibrium plasma arcjet as a high heat flux source

Get access (open in a dialog) DOI: 10.1615/IHTC12.910
6 pages

Resumo

In order to develop a simplified diagnostic method of non-equilibrium plasma arcjets, measurement with a thermocouple and an infrared thermography equipment is performed, and the thermodynamical temperature of plasma arcjet is estimated. The plasma arcjet generated in this experiment is non-transferred type, and argon, nitrogen, and hydrogen gases are used as working fluids. High heat flux over 30MW/m2 has been achieved stably so far. As a result of measuring the temperature distribution of the plasma arcjet in a measurable low-temperature area with the thermocouple, it is clarified that the plasma temperature rapidly decreases with the increase of radial distance. On the other hand, it is shown that an untrue radial temperature distribution observed with the infrared thermography equipment almost agrees with the true radial temperature measured with the thermocouple if Abel conversion is applied to the thermography data. From this calibration, it may be possible to measure the absolute thermodynamical temperature of the non-equilibrium plasma in a high-temperature core area by the method combining the thermocouple and the infrared thermography equipment. It is confirmed that the plasma thermodynamical temperature in the core area near the nozzle exceeds 10000K.