Numerical investigation of the effect of grain fuel composition in ramjet combustion chamber on ignition delay time and solid fuel regression rate

This study investigated the effect of grain fuel composition in the ramjet combustion chamber on the ignition delay time and solid fuel regression rate. In this article, a numerical investigation of ignition and stabilization of combustion of a new design of an engine equipped with solid fuel is done. The rod design consists of two solid fuels, maintaining the simple design of the classic ramjet. Numerical simulations of unsteady, turbulent, reactive and disintegration due to solid fuel by simultaneously solving combustion and turbulence models, applying numerical methods in the analysis of the governing equations that are the basis for obtaining some results including the effect of variables, functional characteristics and characteristics Combustion and finally access to the ignition delay time of fuel-rich propellant in solid fuel ramjet systems. In examining the chemical reactions of the combustion chamber, heavy polyethylene is taken into consideration and finally the ignition and combustion process continues. In line with the diagnosis for the correct prediction of the ignition delay time in the two mentioned geometries, the simulation results were in good agreement with the experimental data of the comparison and the selected model. The ignition delay time for the rod geometry was 0.28 seconds, for the classic geometry it was 0.43 seconds. And the design with the rod has increased the fuel regression rate.
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