Control of Leading-Edge Vortex Breakdown by Trailing Edge Injection

Abstract

The goal of this research is the control of the vortex breakdown locations over sharp-edged, slender, delta wings at high angles of attack. Water tunnel tests of a 75-deg delta wing examined symmetric and asymmetric trailing-edge jet injection as a method to control and delay the leading-edge vortex breakdown locations. These tests were accomplished at angles of attack between 20 and 40 deg at freestream velocities of 10 and 20 cm/s. Flow visualization data provide a description of the leading-edge vortices and of the vortex breakdown locations. The results demonstrate the ability of symmetric and asymmetric trailing-edge jet injection to control the leading-edge vortex breakdown locations. However, elevated trailing-edge injection mass flow rates create dramatic negative influences and accelerate vortex breakdown, especially for asymmetric flow control cases