Evaluation of plume characteristics of arc-heaters with various oxygen injection systems |
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| Authors: | Makoto Matsui Tomoyuki Ikemoto Hiroki Takayanagi Kimiya Komurasaki Yoshihiro Arakawa |
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| Affiliation: | aDepartment of Advanced Energy, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan;bDepartment of Aeronautics and Astronautics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan |
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| Abstract: | Arc-heater plumes generated by various oxygen injection systems were investigated by laser absorption spectroscopy. Firstly, oxygen was directly injected into a high-temperature cathode-jet region through a thoriated-tungsten hollow cathode. Although number density of atomic oxygen was increased, erosion of the cathode was too severe to maintain stable discharge. Then, zirconium was used as a cathode material to reduce cathode erosion by oxidation. As a result, stable discharge was maintained for 3 h with pre-mixed argon–oxygen injection and number density of atomic oxygen was successfully increased. |
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| Keywords: | Arc-heater Atomic oxygen Zirconium cathode Laser absorption spectroscopy |
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