| Co-Investigator(Kenkyū-buntansha) |
DR. MAKABE Toshiaki Associate Professor, Faculty of Science and Technology, Keio University, 理工学部, 助教授 (60095651)
沢 孝一郎 慶應義塾大学, 理工学部, 助教授 (10051674)
玉河 元 慶應義塾大学, 理工学部, 客員教授 (90022970)
DR. AMANO Hiroshi Emeritus Professor, Faculty of Science and Technology, Keio University, 理工学部, 名誉教授 (90050963)
DR. SAWA Kouichiro Associate Professor, Faculty of Science and Technology, Keio University
DR. TAMAGAWA Hajime Guest Professor, Faculty of Science and Technology, Keio University
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| Research Abstract |
1. TEST LIQUIDS AND PROCEDURE Test liquids used were as follows:. n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, cyclo-hexane, methyl-pentane as saturated hydrocarbon liquids, 1-hexene, benzene as unsaturated hydrocarbon liquids, pure water with various resistivities, and liquid nitrogen, liquid helium as cryogenic liquids. In the experiments, light emission, photo current, and conduction current were measured simultaneously. Also the propagations of the light emission and the streamer(density change) by the schlieren method with an image converter camera were observed.
2. LIGHT EMISSION The light inception voltage with the negative point configuration was lower than that with the positive point for hydrocarbon liquids and liquid nitrogen. On the other hand, the one with the negative point was higher than that with the positive point for pure water. Among hydrocarbon liquids, the light inception voltage of saturated ones were lower than that of unsaturated ones and that of chained ones were lower than that of circular ones.
3. STREAMER (DENSITY CHANGE) The negative streamer and the positive streamer, the patterns of which were distinguished by the tree type and the bush type, were different from each other. The calculated propagation velocities were also different between the negative point and the positive point. For the negative point, the velocities were from one to a few hundred m/s for hydrocarbon liquids, a few hundred m/s for the liquid nitrogen and pure water. On the other hand, for the positive point, they were from one to a few km/s(hydrocarbon liquids), and a few 10 km/s(liquid nitrogen and pure water).
4. PURE WATER The resistivity and the flowing velocity of the pure water effected on the light emission pulses and their peak values, and did not influence the light emission patterns of breakdown.
5. LIQUID HELIUM The breakdown voltage of the negative point was lower than that of the positive one.
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