VOF Model of a Bi-Swirl Injector for a Rocket Engine
DOI:
https://doi.org/10.70567/mc.v41i20.108Keywords:
Computational Fluid Dynamics (CFD), biswirl injectors, aerospace propulsion, volumeof- fluid (VOF), numerical simulation, injector designAbstract
The injection of liquid propellants into the combustion chamber of rocket engines presents several challenges, among which the correct atomization and mixing of the oxidizer and fuel stand out. Bi-swirl injectors are an attractive option for this application due to their excellent atomization capability. Atomization is achieved through the injector’s centrifugal design, which produces two concentric conical sheets. These sheets decrease in thickness, leading to the propagation of instabilities and subsequent atomization. However, predicting the discharge angle of the conical sheets is difficult, especially with hypergolic propellants. This work presents the CFD modeling of a bi-swirl injector using the Volume of Fluid (VOF) method implemented in the OpenFOAM suite. The model’s results were compared with experimental data obtained from an injector test bench. Adjusting the turbulence damping, required by the interfacial model, was necessary to improve discharge angle predictions.
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