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%.