Flow physics of annular and semi-annular fanjet and integration scheme with aircraft wing.

This article focuses on investigating the flow physics and aerodynamic integration of bladeless fanjets—annular and semi-annular jets based on the Eppler-473 airfoil—with aircraft wings to optimize aerodynamic forces and improve flight efficiency. Using computational fluid dynamics (CFD) and experimental methods, the study analyzes the effects of geometric parameters such as fanjet radius, jet width, and angle of attack on velocity profiles, static pressure, mass flow rate, and aerodynamic drag. Results indicate that smaller fanjet radii and jet widths, combined with zero or positive angles of attack, maximize induced mass flow and minimize drag, making these configurations preferable for wing integration. Experimental validation with a semi-annular fanjet attached to a flat plate confirmed key flow features like inducement, entrainment, and vortex formation, supporting the computational findings. The study concludes with recommendations for future work on optimizing fanjet placement and geometry for enhanced aerodynamic performance on aircraft wings.