Omer Musa

Combustion modeling of unsteady reacting swirling flow in solid fuel ramjet

The differences between finite-rate and eddy- dissipation models for simulating unsteady reacting swirling flow through solid-fuel ramjet engine are investigated. An in-house code has been developed to solve governing equations of compressible flow field with chemical reactions. The code is verified, validated, and then used to perform unsteady simulations on solid-fuel ramjet engine with high-density polyethylene. The results showed that both models are act similar, however, finite-rate model is preferred in such combustors with non-premixed flames (diffusion flames) over eddy-dissipation model.

Effect of using swirl on reacting flows in solid-fuel ramjet

In this paper, the influence of swirl on solid fuel regression rate and combustion phenomena in a solid fuel ramjet has been investigated numerically. Firstly, an in-house code has been developed to solve axisymmetric Reynolds-averaged Navier-Stokes equations of the unsteady turbulent swirling compressible flow field with chemical reactions. Secondly, unsteady simulations are carried out for unsteady reacting turbulent flows with and without swirl in a solid fuel ramjet using high-density polyethylene (HDPE) solid fuel. Then, the computational results are analyzed and discussed. It is found that the presence of swirl is more effective in enhancing the regression rate and the turbulent mixing throughout the ramjet. Moreover, increase swirl number increases the heat and mass transport at the fuel surface and hence increases the regression rate.