Effects of different injectors on spray characteristics of power-law non-Newtonian propellant

In order to seek the effective injector type of the power-law non-Newtonian propellant, a water-based simulants whose rheological behavior was in accord with actual propellant was used. The injectors, including plain orifice, impinging injector, shearing impinging pneumatic atomizer, effervescent atomizer and swirling injector were investigated by experiments, and the effects of different injectors and their structural parameters on the spray characteristics were compared. The results indicate that the impinging injector is effective and its impinging angle and injection velocity are the main influencing parameters to spray property. The effervescent atomizer is an effective injector type. Water-based simulants break up and produce drops when ratio of air/liquid mass flow rate is about 4%. ©, 2014, BUAA Press. All right reserved.