Study on hypersonic drag and heat reduction of a spiked blunt body with multiple flat aerodisks and rear opposing jets

Abstract

The performance of a proposed drag and heat reduction scheme that combines multiple flat aerodisks and the rear opposing jet is numerically investigated using compressible Reynolds Averaged Navier-Stokes (RANS) equations coupled with the shear stress transport (SST) turbulence model. Results show that the introduction of the multiple flat aerodisks and the rear opposing jet push the reattachment shock wave away from the blunt body and reduce the intensity of reattachment shock wave as well. Compared with the configuration with only a spike and a conical aerodisk, the present configuration shows a reduction in peak pressure and peak heat flux of the blunt body surface by 70.21% and 84.84%, respectively. Furthermore, the impact of configuration parameters (i.e., jet pressure ratio, spike length, aerodisks diameter, number, and position) on the flow field, drag and heat reduction performance are also investigated. The results reveal that increasing the jet pressure ratio can enhance the performance of drag and heat reduction. Increasing the length of the spike can get a better drag reduction performance. Increasing the diameter of flat aerodisk Ⅲ significantly enhances the compression of hypersonic free stream to reduce the intensity of reattachment shock wave. The configuration with four flat aerodisks has better drag and heat reduction performance. Compared with the baseline configuration, the maximum reduction of peak pressure and peak heat load of the blunt body surface can be achieved by moving the flat aerodisk Ⅱ forward.