Abstract
The following work reports a study that uses spontaneous emission spectroscopy for the evaluation of the average temperatures of the plasma shock layer and the test article surfaces subject to the hypersonic jet generated by the Plasma Wind Tunnel (PWT) facility at CIRA. Besides the qualitative information about the species of the hypersonic free stream emission generated by the SCIROCCO arcjet plasma tunnel, the most powerful PWT in the world, the main emission from the species in the shock layer can be obtained.The methodology uses the radiation emitted by the test article, in the UV–VIS-NIR (i.e. Ultraviolet–Visible-Near Infrared) spectral ranges from which the surface temperature and the emissivity values can be obtained. The camera lens connected to the spectrometer was placed in order to frame the side of a C/SiC test article flap, subject to a known PWT fluid-dynamic flow condition expressed in terms of total pressure P0, total enthalpy H0 and air mass flow rate. Finally by crossing the data obtained from the Optical Emission Spectroscopy (OES) with thermographic ones, it has been possible to estimate the surface emissivity value in the camera LWIR working ranges.A compact spectroscope, Ocean Optics USB 2000, with no moving parts and no cooling sensor has been used for the acquisitions. For the IR thermographic results a FLIR A655 SC, working in LW (Long Wavelength) IR spectral range, was used.
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