Pre-Test CFD and Analyses for The Tiltwing Test Rig Experiment

In preparation for the Tiltwing Test Rig experiment at NASA Langley’s 14- by 22-Foot Subsonic Tunnel, a series of CFD simulations are being run using OVERFLOW to better understand the physics involved. The first study focuses on determining the best reduced-order model to use for the proprotors. The two models being investigated are the Pressure Difference model that uses a uniform pressure jump and the Rotor Disk model which is based on bladeelement theory. Using a reduced-order model to approximate the proprotors significantly reduces convergence time and computational expense, offering a practical alternative to high fidelity simulations. The selected model is then be used in subsequent pre-test CFD studies. The first is focused on performing a component build-up to better understand the effects of each geometric component on the aerodynamic performance. The second is a study of the aerodynamic effect of varying the proprotor turning direction. The third, and final study, looks at the effects of changing the flap deflection angle.