In order to investigate electron number density of OREX re-entry flight environment, the electrostatic-probe data are analyzed with a help of CFD(Computational Fluid Dy-namics). Following the probe theory, the electron number density is calculated from the ion saturation current measured by the electro-static probes. Although the theory also requires information of flow velocity and electron temperature, neither of them strongly affects the electron number density, and CFD supplements these data. During the re-entry phase at altitudes from 100km to 75km/85km, OREX obtained valid ion saturation current data, which are almost free from under/over flow, and the probe are estimated to be kept under the breakdown temperature, 500 degrees celius . In this data analysis, the re-entry flow fields are simulated along the best estimated flight trajectory using the one-temperature model and Park's two-temperature one. The calculated electron number density is ranging from 1015 to 1019/m3. These results are directly compared with the numerical results, and the validity of the physical model and wall condition used in CFD is discussed.
静電プローブのデータ解析
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