Abstract
Emission spectroscopy is a unique method for accurately determining the total enthalpy of arc wind tunnels. However, the method can be applied to only the thermochemical equilibrium region. Because arc flows are generally rarefied, the applicable flows are very restricted. To remove this restriction, we propose a new approach in which an magnetohydrodynamic shock layer enlargement is used to produce the thermochemical equilibrium region in rarefied arc flows. This study designs a magnet-mountable water cooling probe, and conducted the preliminary heating test of the nonmagnetized probe and emission spectroscopy from the shock layer using the ISAS arc wind tunnel. As a result, the probe had no damage despite the long heating time of 60 sec and strong heating rate of 3.6 MW/m^2. The temperature of the probe inside was under 31 °C. Therefore, the probe was found to be reusable and to be free from the thermal demagnetization. Moreover, the emission spectra show that the shock layer in front of the non-magnetized probe is in thermal non-equilibrium.
