A numerical study of solid fuel combustion under supersonic crossflows

Modeling LiH Combustion in Solid Fuelled Scramjet Engine

“…Numerically, that translates to formulating mass, momentum, energy and species sources located near the surface. This model predicts LiH regression rates that are comparable with those obtained by Jarymowycz et al and Ben-Arosh et al 22,23) Despite the limitations due to the standard k-ε model, and to the assumption made about the Li/O 2 reaction rate, results are still intriguing. An intense flame zone is predicted to be present over the decomposing surface and downstream of the grain in the cylindrical configuration; the flame does not extinguish, and high temperatures (of order 2900 K) are obtainable.…”

“…The surface regresses at a rate comparable to that calculated by Jarymowycz and Kuo 22 , (see Fig. 12) The total LiH mass flow rate injected into the chamber for the cylinder geometry is 0.065 kg/s; that of inlet air is 2.77 kg/s; thus this scramjet combustor is working at an air-to-fuel ratio A/F = 42.…”

“…22; in particular we have selected the following combustor inlet conditions: The geometries considered in this analysis (hereinafter referred as "cylindrical" and "dump combustor", respectively) are shown in Fig. 10.…”

“…Turbulence was modeled using a standard k-ε model. [22][23][24][25][26] The boundary conditions at the interface between regressing grain and gas required detailed considerations and are presented in the following section.…”

Numerical investigation on cavity structure of solid-fuel scramjet combustor

“…In the experiments of Saraf and Gany [6], it was concluded that metalized solid-fuel scramjet combustor had slightly higher fuel mass flow rate than the non-metalized one. Theoretically, Jarymowycz et al [7]'s numerical simulation for a two-dimensional solid-fuel cylindrical chamber combustion proved that there was a distinct flame region over the fuel sample and that both inlet temperature and pressure had a strong influence on the burning rate. However, at a higher pressure, the energy released by combustion was not sufficient to further raise the crossflow temperature, consequently causing a slight influence on the burning rate.…”