衝撃圧縮空気が吹き付けられた過渡アークに対する巨視的モデル
1985 年 54 巻 6 号 p. 596-602
詳細
1985 年 54 巻 6 号 p. 596-602
This paper proposes a macroscopic arc model applicable to the transient d. c. arc axially blasted by impulsive compressed air. Its presure as well as the blasted velocity are higher than those adopted in modern power circuit breakers. Thermal dissipation out of the arc column is well estimated by a slightly modified heat transfer relationship derived for a solid cylinder in forced convection.
The exponentially decaying d. c. current produced in an inductance-free RC circuit is stronly suppressed when a switching arc is axially blasted by the impulsive compressed air induced by explosin of a detonator. The calculated suppressed current waveforms coincide with those actually obtained experimentally under the following various conditions: the recovery voltage from 1.5 to 6 kV, the pressure of the blasted compressed air from 0.77 to 1.47 MPa and the velocity from 730 to 1130 m/s.
