A sensitivity study on a cfd model for paraffin-based hybrid rockets

A recently validated numerical approach based on Reynolds-averaged Navier-Stokes simulations for paraffin-based hybrid rocket engines is here considered. The model is evaluated in terms of its sensitivity to specific parameters, such as paraffin’s melting temperature and radiation emissivity coefficient, and Schmidt numbers. Moreover, a simulation performed at the average port diameter is confronted with a series of simulations at increasing port diameters. Finally, oxidizer-rich test cases are considered, and the effect of the post-chamber length on the combustion efficiency is investigated.