Variable Cycle Engines (VCEs) are a new family of engines that can dynamically modify their thermodynamic cycle to adapt to different flight conditions, being able to offer the efficiency of a high-bypass turbofan at subsonic speeds and the high specific thrust of a turbojet at supersonic speeds. To be able to do this, VCEs include components with variable geometry that regulate airflow and thermal cycle parameters, such as Variable Area Bypass Injector (VABI), Variable Stator Vanes (VSVs), compressor Inlet Guide Vanes (IGVs) and variable area exhaust nozzle. This study focuses on the Rear Variable Area Bypass Injector (Rear VABI), a key component that is the analog of the mixer in traditional turbofans.