Flow behavior of power law model gelled propellant in the pipe

In order to study the flow characteristic of power law model propellant in the pipe,three type propellant simulants were used in experiment and numerical calculation with different velocity for a group of straightness pipes that have different diameter and length as well as a group of bend pipes that have different bend angle and bend radius ratio.Simulants were used in calculation in the different velocity for contractive pipe and expansionary pipe that have different contractive angle and contractive ratio.The results showed that the increase of pipe length,curving angle,velocity and contractive ratio would lead to the increase of the flow losses on the same conditions.There is a plug flow area in the pipe.The characteristic of plug flow area is dependent on the propellant velocity,power law exponent and the consistency index.Near the mural area of the pipe,the shear rate is the largest and the apparent viscosity is the minimum.The shear rate at inboard wall of the bend pipe is smaller than the one at the pipe outboard.Near the mural area of the contractive pipe,the shear rate increases and shear viscosity decreases.There is a lower velocity swirl area in contractive pipe and expansionary pipe.