Assessment of Self-Noise Models Using NFAC Measurements of the Joby Aviation Propeller
Nikos Trembois, Michael Marques Goncalves, Austin Thai, Jeremy Bain
Abstract
Broadband self-noise is predicted for the full-scale Joby Aviation propeller and results are compared with acoustics measurements taken in the National Full Scale Aerodynamics Complex at NASA Ames Research Center. The blade sectional loading and inflow for the experimental propeller states were calculated with panel method, free wake simulations using CHARM. The boundary layer parameters at the equivalent inflow were computed with 2D analysis from XFOIL and two different turbulence models in OVERFLOW. The blade self-noise is predicted with the UCD-QuietFly broadband noise prediction software using Amiet's theory and the Lee wall pressure spectrum model. The results show promising correlation of SPL across the spectrum between the predicted and experimental turbulent boundary layer trailing edge noise. Nevertheless, further development is necessary to enhance broadband noise models to capture trends with blade pitch and RPM seen in the experimental data.