| Solid fuel scramjet may present the same advantages as other solid fuel motor: simplicity,high reliability, safety, as well as rather higher energy density level resulting in a more compact system, and easy storage for long duration. Cavities have gained the attention of this ramjet community as a promising flame holding device; computations are done on the increasing mixture of scramjet.Numerical simulations are confirmed by the Ben-Yakar’s experiments. Scientific visualization of the numerical simulations by the Shear Stress Transport k-ω model allows a detailed analysis of shocks and waves. Pressure and velocity coupling algorithm,second-order-upwind computational fluid dynamics and one-step reaction are used for simulating the dynamic flow associated with an axisymmetric, cavity installed combustor under reacting conditions. The study reveals that the cavity provides a fuel enrichment zone and a stable pool of hot reaction products. A thermal choke is caught in the flow field for initial geometry and a shock train appears in the main flow and has a tendency to extend with surface regression.With the sequence of three regression shapes, the fuel diffusion from solid fuel surface becomes more violent and furthermore, enhancing the overall efficiency, which is nearly up to 38% at the outlet of combustor.Dimensions of the cavity structure for solid fuel scramjet combustion within the mixing impact analysis, this paper presents the ratio of cavity expansion α, the ratio of cavity convergence β,the ratio of cavity length to depth y and the cavity aft wall angle 0 four relatively independent cavity structure parameters.The numerical calculation of each parameter α= 18, β= 0.2, γ= 4,θ= 60° are relatively better structural parameters. At the same time there is no cavity and the cavity by comparing the cavity that significantly improve the performance of the engine. The scramjet which has cavity are always has more overall efficiency than the no cavity, which is nearly up to 46% -66%. |
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