Effect of Energy Pulse on 3-D Edney IV Interaction

Abstract

This study investigates the effect of energy deposition on pressure and thermal loads generated by an Edney IV interaction. This complex supersonic jet impingement problem is formed by the intersection of an oblique shock generated by a 15-deg wedge with a Mach 3.45 bow shock in front of a 0.0254-m diam sphere. The full three-dimensional Reynolds-averaged Navier-Stokes equations are solved with the k-w turbulence model. Mesh-resolved simulations show that surface pressure without energy addition is in good agreement with experiments. The peak value is 1.8 times that observed without the impinging shock. Results from a grid resolution study confirm that the surface pressure is less sensitive than the heat flux. For flow control, a spherical energy pulse with a volume of 3 mm 3 and energy of 283 mJ is deposited upstream of the primary triple point. The unsteady interaction of the energy spot and its induced blast wave with the oblique shock, the distorted bow shock, and the impinging supersonic jet is elucidated in the context of the lensing phenomenon. The simulations indicate significant impact of the energy deposition on the surface pressure and heat flux. The instantaneous surface pressure and heat flux rise when the blast wave and high-energy spot hit the surface and fall when the expansion waves reach the surface. However, the overall integrated stress and thermal loads are reduced, mainly due to the effect of the expansion waves.