An experimental investigation is conducted to determine the collision of droplets for an aluminized composite propellant using an innovative apparatus at various impact velocities. Droplets before and after collision are collected by means of quench-bomb technique. The morphology, composition, and size of the collected particles are analyzed with the aid of a scanning electron microscope, an X-ray powder diffraction, and a Malvern Mastersizer 2000. It is found that collected particles of various sizes are all spherical with diameters from 0.03 to . Collected particles mainly contain and Al. In addition, collision/coalescence of smaller droplets with larger droplets occurs dominantly in the converging nozzle. For the relative velocities of collision ranging from 3.8 to , the mean particle diameters and decrease after collision. The higher the relative velocity of the collision is and the larger the droplet diameter is before collision, the fiercer the fragmentation will be. Furthermore, collision causes fragmentation of droplets with diameter larger than as well as a significant reduction in volume fraction. Collision causes little volume fraction changes for droplets with diameter of but results in large volume fraction increases for droplets with diameter smaller than .
Experimental Study of Collision of Liquid Droplets
Journal of Propulsion and Power ; 29 , 1 ; 95-103
2013-01-01
Article (Journal)
Electronic Resource
English
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