Numerical Analysis of Surface Heat Flux in a Forward-Facing Cavity
Passive, semi-passive and active techniques are in active research to tackle the range of heat loads encountered by the hypersonic vehicles. The forward-facing cavity is one of the effective passive techniques explored for hypersonic short-duration vehicles in low-altitude atmospheric conditions. Studies show that the shape of the cavity plays a major role in reducing surface heat flux of the vehicle. To understand comprehensively the surface heat flux characteristics, we have considered the important cavity geometrical parameter, cavity length (L)/cavity diameter (D) ratio, from 0.5 to 5 and compared with and without cavity conditions. The transient simulation results showed that around 10–28% of heat flux reduced over the outer body surface. The variation of pressure and temperature at the cavity base and along the cavity wall for different L/Ds is also discussed.