Chanho KIM, Yosheph YANG, Jae Gang KIM, Kyu Hong KIM
DOI Number: XXX-YYY-ZZZ
Conference number: HiSST 2024-00162
In hypersonic computational fluid dynamics studies, using a two-temperature model to simulate thermochemical non-equilibrium states is common. The two-temperature model assumes translational-rotational, electron-electronic-vibrational temperatures and includes the assumption that each energy has an equal temperature. In this study, the temperature of each energy mode was separated and the effects were analyzed. The three-temperature model uses translational-rotational, vibrational, and electron-electronic temperatures by independently calculating the electron-electronic temperature from the two-temperature model. The four-temperature model calculated the rotational temperature independently. To accurately calculate the electron-electronic temperature, not only the Lee model but also the Laporta model was used to model the e-V relaxation time of N2,O2,NO. The validation of the multi-temperature model solver was performed by comparing the heat flux of ELECTRE, LENS-XX experiments, and the electron number density of RAM-C. The effect of the multi-temperature model is most pronounced in the wake region, where the flow expands and affects the formation of ions and electrons.