Hypersonic waverider configurations are promising candidates for future space and defence applica... more Hypersonic waverider configurations are promising candidates for future space and defence applications as they meet the stringent demands of aerodynamic efficiency at high Mach numbers. An attempt has been made here to study the high angle of attack characteristics of such configurations at hypersonic Mach numbers using HiFUN. At high angle of attacks the simulations compares well with the Newtonian theory as the upper surface pressures are negligible compared to the lower surface pressures. The aerodynamic efficiency is maximum at 4 degree and the configuration stalls at 45 degree.
7th Symposium on Applied Aerodynamics And Design of Aerospace Vehicles
Low enthalpy turbulent flows pertaining to 2D scramjet inlets are characterized by strong entropy... more Low enthalpy turbulent flows pertaining to 2D scramjet inlets are characterized by strong entropy gradients in the flow field, massive viscous dissipation, complicated shock-shock interactions and shock-wave boundary layer interactions. Prediction of these phenomena using numerical simulations still remains a major hurdle. In the present study, turbulent RANS simulations were carried out over standard test cases pertaining to two dimensional scramjet inlets using Spalart - Allmaras (SA) and k-ω turbulence models. Qualitative and quantitative comparisons were made with the experimental Results and other CFD solvers. Results indicate that, k-ω SST turbulence model can predict, the aerodynamic heating phenomena better compared to SA and is recommended for use in such flow regimes.
Waverider is a lifting body tailored to create high lift to drag ratio in high speed flow. Presen... more Waverider is a lifting body tailored to create high lift to drag ratio in high speed flow. Present work includes optimization of power law derived waverider using TLBO for a design altitude of 30km at zero design angle of attack and for a range of angle of attack from -2 to 6 for inviscid, laminar and turbulent cases at design Mach number from 5 to 8. Optimised waverider geometry parameters for all three cases are compared for two objective functions; (a) maximization of lift to drag ratio and (b) maximization of lift to drag ratio and volume along with minimization of heat flux (represented by wetted area in present study). Dependence of n, δ and λ (design variables) on lift to drag ratio is discussed in detail. Numerical and experimental validation of the analytical model shows a close match with the data available in the literature. Despite having some limitations, this model serves as a valuable design tool in the conceptual phase to arrive at optimised waverider configurations. Optimization function can be changed according to the designer’s requirements.
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Papers by Yogendra Singh