2020 年 18 巻 5 号 p. 237-242
This paper presents expansion tube specifications and characteristics using high-speed imaging, the emission intensity of flow, and the pressure probe using a 35 mm square bore and 15 m total length expansion tube in ISAS/JAXA. To elucidate test gas acceleration processes, several visible windows can be used to observe flow static pressure and emission intensity. Results show that the shock wave and test flow velocities, flow density, and flow temperature were, respectively, 7.8 km/s, 7.2 km/s, 0.02 kg/m3, and 5922 K with 44 μs test time duration. This study obtained characteristics of expansion tube flow which can be compared with numerical calculation or more accumulated measurements.