The detonation front curvatures were observed with an optical technique for the emulsion explosives sensitized with various sizes of inorganic or organic microballoons. The detonation fronts in the emulsion explosive sensitized with smaller voids up to 0.5 mm are smooth, and those in the emulsion explosives containing larger balloons are shown to be turbulent. The reaction zone length calculated from the Wood - Kirkwood equation, which relates the curvature of the detonation wave front and the reaction zone length, correlate fairly well with that derived from the Eyring's equation, which gives the reaction zone lengths from the diameter effect of the detonation velocity. The effects of the increase of water content and the addition of aluminum powder into the emulsion explosive formulation were evaluated by observing the detonation front curvatures to calculate reaction zone length.
種々の大きさの気泡体を含有するエマルション爆薬の爆轟波面形状が光学的に観測された｡ 気泡体としてガラスマイクロバルーンやシリカバルーンなどの無機質発泡体と, 樹脂である有機質の発泡体が用いられた｡ 気泡体の直径がおよそ0.5 mmよりも小さい場合には気泡体の材質に関係なく爆轟波面は滑らかであるが, それよりも大きくなると波面に乱れが生じた｡ これは気泡体の発光を捕らえているために生じたものと考えられた｡ Wood - Kirkwoodの提案した式に基づいて波面の曲率から計算された反応領域の長さは, Eyringの式に基づいて爆轟速度の形状効果から求められた反応領域長さと比較的よく一致した｡ 爆薬中の水分の増加, アルミニウム粉の添加等による反応領域の長さへの影響が評価された｡