報告書番号

W87001

タイトル（和文）

微小電流領域における静止大気中垂直アークの諸特性

タイトル（英文）

CHARACTERISTICS OF 10-100MA VERTICAL ARCS INSTILL AIR

概要 （図表や脚注は「報告書全文」に掲載しております）

・交流アークの安定性を解明する基礎特性として交流５０Ｈｚの１０～１００ｍＡ級の微小電流アーク特性を解析するとともに実測値と比較した。・主なアーク条件………大気中１気圧。静止・垂直。・アークの電界Ｅと電流ピーク値Ｉとの実験式Ｅ（Ｖ／ｃｍ）＝１４５・Ｉ（Ａ）の－０．４８乗・この領域の微小電流アークに対しても電子温度を粒子温度に等しいとした－温度モデルによる局所熱平衡安定化理論がおおむね拡大適用できる。

概要 （英文）

TO INVESTIGATE THE STABILIZING CHARACTERISTICS OF VERY LOW CURRENT ARCS,THE CHARACTERISTICS OF 10-100MA VERTICAL FREE-BURNING ARCS IN STILL AIR WERE MEASURED AND COMPARED WITH THE CALCULATED RESULTS AS FOLLOWS: (1) THESE VERY LOW CURRENT ARCS WERE OBSERVED TO BE NATURALLY SUSTAINED BETWEEN A 3-CM ELECTRODE GAP WITHOUT A SELF-EXTINCTION OR LOOPING TENDENCY. (2) THE PHOTOGRAPHED ARC RADII WERE NEARLY PROPORTIONAL TO THE ROOT OF THE CURRENT WITH A CONSTANT CURRENT DENSITY OF ABOUT 1 A/SQUARE CM. (3) THE ARC VOLTAGE AND VOLTAGE GRADIENT E BOTH DECREASED WHEN THE ARC CURRENT I INCREASED AND THE LATTER WAS EXPERIMENTALLY FORMULATED AS FOLLOWS: E(V/CM)=145 I(A)**-0.48(1) THESE RESULTS AGREE WITH THE CHARACTERISTICS CALCULATED BY USINGA STABILIZED ARC MODEL WITH ELECTRIC CONDUCTIVITIES AND THERMAL CONDUCTIVITIES OF HIGH-TEMPERATURE AIR UP TO 5,000K. (4) THE ARC CONDUCTIVITY RADII WERE CALCULATED TO BE VERY NARROW AT ABOUT ONE SEVENTH OF ARC THERMAL RADII. (5) FOR EXAMPLE A 10MA ARC FLOWS WITH A VOLTAGE GRADIENT OF 1,320V/CM,A PHOTOGRAPHED RADIUS OF 0.7MM,A MEAN CURRENT DENSITY OF 0.65A/SQUARE CM AND AN ARC POWER OF 13W/CM.

報告者

キーワード