Nonequilibrium Temperatures Measurement in an Arc-Heated Airflow by the Optical Diagnostic Method

抄録

An understanding of the aerothermophysical feature of the high-enthalpy flow is important for designing atmospheric hypersonic flight vehicles based on the ground-heating test results. Nonequilibrium temperatures of nitric oxide of the arc-heated airflow were measured by the optical diagnostic method in the Institute of Space and Astronautical Science (ISAS) arc wind tunnel facility as a part of the flow characterization. Nonequilibrium temperatures of NO γ-band (A²Σ–X²Π_1⁄2) measured experimentally by 2-line and multiline laser-induced fluorescence spectroscopy techniques exhibit separation between vibrational and rotational temperatures. The temperature relaxation along the flow has been compared with the emission spectroscopic data.