Hypersonic Flow Field Reconfiguration and Drag Reduction of Blunt Body with Spikes and Sideward Jets

Abstract

Flow field reconfiguration and drag reduction have been investigated by numerically solving Navier-Stokes equations, with the 2nd order dispersion controlled dissipative scheme adopted for the convective term discretion and the 2nd order central difference scheme for viscous term. Spikes and sideward jets nearby the spike noses were set up in the front of the blunt body to reconfigure the flow field and reduce drag during hypersonic flight. The spikes and the sideward jets led to the formation of the conical shock, the reattached shock, and the circumfluence, instead of a bow shock. According to the quantitative analysis, the reconfiguration of the flow field played a dominant role in drag reduction. Basing on the locations of the reattached shock and its interaction with the conical shock, a combined parameter was proposed for a primary criterion to design the spiked bodies with sideward jets for the purpose of drag reduction.

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

“…Jiang et al confirmed their findings numerically and proved that lateral spike further enhanced the aeroheating reduction capabilities of the plain spike [304,306]. They recently confirmed that the favorable role of adding the lateral jet diminishes for longer spikes and that freestream Mach number has insignificant impact on the hybrid device effectiveness [307]. Zhu et al [308] extended the investigation on lateral jet; focus was on understanding the impact of lateral jet pressure and axial location on the spike.…”

“…By this augmentation, a jet can compensate short spikes while a spike can compensate low pressure jets [309]. Nonetheless, the benefits of the hybrid device diminish for longer spikes, higher jet pressures, and flow rate [307,321,328]. As for practical implementation of this hybrid device, the same concerns of the conventional opposing jet can be raised namely, space and power demands and source of jet.…”

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

“…After a long gap, recently, this technique has been re-explored but still has immaturity for the implementation of jet position. Jiang et al 111,317 experimentally and numerically reconstructed the idea of combining the spike with the lateral jet to mitigate shock wave and acquire the non-ablation thermal protection ( NaTPS ) system. Results depict that the lateral jet pushes the shear layer away from the spike and efficiently reduces the pressure at the reattachment region, yielding a better reduction in drag and heat even at high angles of incidence.…”