Single-Phase Internal Flowfield Validation with an Experimental Solid Rocket Motor Model

摘要

Incorporating a submerged nozzle for solid propellant rocketmotors, the resulting cavity formed in the vicinity ofnthe nozzle integration part enhances the entrapment of liquid residues of the combustion and leads to thenaccumulation of slag with a considerable mass. As a first step for the slag accumulation assessment, an experimentalnand numerical investigation of the single-phase internal flowfield is performed and the numerical tool is validated.nThe measurements are carried out in a cold-gas simplified model in which the flow is injected from the forward endn(no wall injection). Simultaneously, the experimental configuration is simulated numerically with the help of ancommercial solver (CFD-ACEu0001). The experimental results allowed the full characterization of the complexnrecirculation zone downstream of the inhibitor model and in the cavity. It was also demonstrated that the airflow innthe cavity is slightly altered in case the gas–slag interface is represented either as a rigid or a liquid. The time-naveraged statistical results of the three-dimensional simulation in the midspan plane compare very well to thenexperimental database, ensuring a satisfactory validation. The mean streamlines close to the walls, plotted from thencomputational fluid dynamics field, allow better understanding of the flow structures. The analysis reveals a two-ndimensional flowfield for the studied geometry with locally some three-dimensional behaviors, especially along thenmain recirculation bubble interface.