Numerical simulation of static mixing tubes for HTPB propellant slurry
Adequate mixing of the curing agent and binder in hydroterminated polybutadiene(HTPB)propellants is critical to propellant performance,and the kenics static mixing tube enables adequate mixing of high-viscosity fluids.The viscous shear curve of the propellant slurry was measured using a Minilab miniature twin-screw rheometer.Numerical simulations of the kenics static mixing tube for HTPB propellant slurries has been carried out by computational fluid dynamics(CFD)to analyze the relationship between the inlet flow rate,the number of elements and the element length-to-diameter ratio of the kenics static mixing tube and the pressure drop and mixing effect.Numerical simulations show that the pressure drop is proportional to the inlet flow rate and linearly related to the number of elements,and more than 45％of the pressure loss is concentrated at the nozzle of the mixing tube for extrusion moulding.8 mixing units can complete 99.9％of the mixing,and 12 mixing units can complete 99.99％of the mixing.The secondary flow in the radial direction increases as the L/D ratio decreases.An increase in the L/D ratio from 0.5 to 1.25 enhances mixing and reduces energy consumption at the same time.
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