Experimental Investgation on Vaporized-Detonator in Pulse Detonation Engine

Several types of vaporizeddetonator using multiple tubes in pulse detonation engines were designed to obtain successfull detonation in a gasoline fueled aerovalve PDE with 180 mm diameter.A series of experiments with different structures of vaporized-detonator were carried out,which included comparison tests of different diameters of vaporizeddetonator tubes(φ13 mm,φ16 mm and φ29 mm),identical diameter vaporized-detonator tube(φ29 mm) with and without spirals,and spirals with different vaporized-detonator tube sizes(φ29 mm and φ37 mm).The mechanism of detonation engendering and developing in PDE with vaporized-detonator tubes of different size and structure and their influences on detonation pressure and thrust were analyzed.These results show that PDE with such structure can induce detonation successfully.Under same blockage ratio,increasing the diameter of spring and reducing the wall thickness simultaneously for small tubes in multi-tube detonator is of benefit to net thrust.