文献一覧: 勝木淳 (著者)

Railguns are facilities to accelerate projectiles up to several km/s by the electromagnetic force due to a driving current. A variety of current waveforms are used for railguns developed in the world This paper describes the dependence of a railgun operation on a rising rate of the driving current. The use of the exploding wire as an opening switch enables to change the rise time of the driving current. A secondary arc is likely to appear and the erosion on a rail surface is more severe when the current with a short rise time is used. According to the non-dimensional railgun plasma simulation, the current with a short rise time heats up the plasma so fast that plenty of particles ablated from the bore surface, which seem to be the cause of the secondary arc, increase rapidly in the early phase of acceleration.

2022-11-21 10:18:20
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1 0 0 0 IR Influence of Gas Flow Rate and Reactor Length on NO Removal Using Pulsed Power

著者: Namihira Takao Tsukamoto Shunsuke Wang Douyan Hori Hideo Katsuki Sunao Hackam Reuben Akiyama Hidenori Shimizu Masaru Yokoyama Kenichi ナミヒラタカオツカモトシュンスケホリヒデオカツキスナオアキヤマヒデノリシミズマサルヨコヤマケンイチオウトエン浪平隆男勝木淳秋山秀典王斗艶
出版者: Institute of Electrical and Electronics Engineers
雑誌: IEEE TRANSACTIONS ON PLASMA SCIENCE
巻号頁・発行日: vol.29, no.4, pp.592-598, 2001-08
被引用文献数: 8 49

A short duration of 100-ns pulsed power has been used to remove nitric oxide (NO) in a mixture of nitrogen, oxygen, water vapor, and NO, simulating flue gases from a power station. The effects of the gas flow rate, the reactor length, and the pulse repetition rate on the percentage of NO removal and its energy efficiency are reported. The percentage of NO removal at a fixed gas flow rate increased with increasing pulse repetition rate due to the increased energy into the discharge. At a fixed pulse rate, the removal of NO increased with decreasing gas flow rate due to the increased residence time of the gas in the discharge reactor, thus facilitating the creation of increased radicals of O and N which then decreased NO. The energy removal efficiency of NO (in mol/kWh) decreased with increasing gas flow rate and increasing removal ratio of NO. The removal of NO increased with increasing energy density (J/I) input into the discharge at different reactor length.

2018-03-04 11:45:54
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1 0 0 0 IR Positive- and Negative-Pulsed Streamer Discharges Generated by a 100-ns Pulsed-Power in Atmospheric Air

著者: Wang Douyan Jikuya Manabu Yoshida Seishi Namihira Takao Katsuki Sunao Akiyama Hidenori オウトエンジクヤマナブヨシダセイシナミヒラタカオカツキスナオアキヤマヒデノリ王斗艶軸屋学吉田政史浪平隆男勝木淳秋山秀典
出版者: Institute of Electrical and Electronics Engineers
雑誌: IEEE transactions on plasma science
巻号頁・発行日: vol.35, no.4, pp.1098-1103, 2007-08
被引用文献数: 6 80

A Blumlein generator that has a pulsewidth of 100 nswas used to investigate the process of streamer discharge propagationin a coaxial cylindrical reactor using a streak camera. Bothpositive and negative polarities of the streamer discharges wereperformed in air at atmospheric pressure. The results showed thatthe primary and secondary streamers propagated with increasingvelocity from the central rod to the outer cylinder electrode inboth positive and negative polarities of applied voltages to the rodelectrode. The propagation velocity of the streamer heads was inthe range of 0.8–1.2 mm/ns for a positive peak applied voltage inthe range of 43–60 kV and 0.6 mm/ns for a negative peak appliedvoltage of−93 kV, respectively. The electric field at streamer onsetwas calculated to be 12 and 20 MV/m for positive and negativeapplied voltages, respectively

2017-11-12 21:15:33
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1 0 0 0 5.パルスパワー技術の応用(パルスパワー技術入門)

著者: 勝木淳高木浩一浪平隆男
出版者: 社団法人プラズマ・核融合学会
雑誌: プラズマ・核融合学会誌 (ISSN:09187928)
巻号頁・発行日: vol.87, no.4, pp.268-275, 2011-04-25
被引用文献数: 12

パルスパワーは,宇宙,慣性核融合,超高エネルギー密度物性研究などの大型科学研究とともに発展してきた.最近では,小型化や高繰り返し化などの電源技術の飛躍的発展によって,光源,環境,医療,食品,農業など,身近なところで利用されつつある.パルスパワー技術入門の最終回となる今回は,パルスパワーの利用形態を述べ,いくつかの特徴的な応用を挙げその概略を述べる.