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EXPERIMENTAL INVESTIGATION OF DETONATION WAVES INSTABILITIES IN LIQUID HIGH EXPLOSIVESтезисы доклада
- Авторы: Сосиков Василий Александрович, Торунов Сергей Иванович, Уткин А.В., Мочалова В.М., Рапота Д.Ю.
- Сборник: "Физика экстремальных состояний вещества" Эльбрус 2017
- Тезисы
- Глава в коллективной монографии
- Год издания: 2017
- Аннотация: Experimental investigation of unstable detonation front structure in mixtures of liquid high explosives (nitromethane and bis-(2- fluor-2.2-dinitroethyl)-formal (FEFO)) with inert diluents (acetone, methanol, diethylene triamine (DETA)) has been carried out. Inhomogeneities have been registered by electro-optical camera NANOGATE 4BP allowing to make 4 frames with the exposure time 10 nanoseconds. According to experimental results the detonation front in nitromethane/acetone mixture is unstable. It is evident that pulsations on detonation front do not form spatial periodic structure and their dimensions differ several times. But mean longitudinal size of pulsation is about 500 micron at 20 percents of acetone concentration. This means that the typical size of cell equals to reaction zone width. The same structure of cellular front have been registered in 70/30 FEFO/methanol mixture. Second kind of instability, failure waves, was observed in neat nitromethane at the free surface. In this case the stability loss result in turbulent flow which is clearly detected in the shots obtained. Adding small amount of DETA (0.5 percent) results in disappearance of the failure waves and flow stabilization. The effect is caused by the fact that DETA sharply accelerates initial rate of chemical reaction because it is sensitizer for nitromethane.
- Добавил в систему: Рапота Даниил Юрьевич