| Citation: | SHAN Xinyou, LI Yingkun, WU Yan, et al. Pipe flow characteristics of pasty propellant based on MAC method[J]. Journal of Aerospace Power, 2023, 38（10）：2430-2440 doi: 10.13224/j.cnki.jasp.20220010
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Targeting the problem of the pasty propellant flow in the pipe and extrusion swell, a non-Newtonian incompressible fluid solver based on the mark and cell（MAC） method and the semi-implicit method for pressure-linked equation (SIMPLE) was developed. Shear-thinning power-law model was used in the constitutive equation of the pasty propellant. The reliability and accuracy of the numerical method were verified by comparing the numerical result of the extrusion morphology of the pasty propellant at the pipe outlet with the experimental result. On this basis, the flow process and extrusion swell of the pasty propellant were numerically calculated and analyzed in detail. The influences of inlet velocity and pipe diameter on the flow characteristics of the pasty propellant were investigated. Results showed that the free surface of the pasty propellant changed with time during the extrusion process. In the stable stage, the free surface of the propellant was hemispherical, and there was obvious extrusion swelling at the outlet of the pipe. When the pipe length and diameter were constant, the pressure drop and the extrusion swell ratio both increased with the increase of the inlet velocity. However, when the inlet velocity was constant, the pressure drop and extrusion expansion ratio decreased with the increase of pipe diameter.
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