A numerical simulation method of co-flow jet airfoil with energy system inside the duct

This paper studies the low speed performance of co-flow jet airfoil with energy system inside the duct. Based on actuator disk theory, the energy system-pump or fan, can be simplified to an ideal actuator disk without thickness, and across the disk the velocity and density of flow are held constant, while the pressure increases. Based on this theory, the two-dimensional flow of the CFJ6415 airfoil is simulated, and a new method for calculating the reaction force is proposed. The simulation employs the validated in-house code, PMNS2D, using Reynolds Averaged Navier-Stokes(RANS) equations with one-equation Spalart-Allmaras turbulence model. Two types of pressure increase distribution across the actuator disk are considered in the numerical simulations. One is uniform and the other is distributed, obtained from a real blade. The numerical simulation results are in good agreement with experimental data, indicating that the numerical simulation method proposed in this paper can well simulate CFJ airfoil with energy system inside the duct. It is of great significance to the design of the inner duct and practical application of co-flow jet technology.