Blade Extensions for Silent Turbines (BEST): Numerical toolbox development. TNO WP4 activities
report
This document summarizes the activities performed by TNO within “WP4: Numerical toolbox development” of the Blade Extensions for Silent Turbines (BEST) project. In this work package, TNO developed and applied numerical models to simulate the noise reduction achieved by the permeable trailing edge add-ons, named MuteSkin, developed by MuTech. Specifically, TNO investigated this technology using a computational fluid dynamics (CFD) model based on the Reynolds-Averaged Navier-Stokes (RANS) equations and the engineering model developed by Brooks, Pope, and Marcolini (BPM). The CFD model was employed to examine the impact of the MuteSkin add-on on the aerodynamic conditions of the blades compared to blades without add-ons. The BPM model, originally designed for nominal blades without trailing edge add-ons, was modified to include the effect of MuteSkin on blade noise. The modification aimed at fine tuning specific BPM model parameters using wind tunnel data. CFD simulations have shown that the boundary layer remains largely unaffected by the presence of MuteSkin-like add-ons. Moreover, it was found that the RANS approach fails to adequately capture the mechanisms responsible for noise reduction. Conversely, the modified BPM model, using the chosen tuning parameters, successfully replicated the experimental noise spectra for profiles equipped with MuTech’s add-ons. BEST has been co-financed with Topsector Energiesubsidie from the Dutch Ministry of Economic Affairs under grant number HER+22-02-03415120.
Topics
TNO Identifier
1023354
Publisher
TNO
Collation
36 p.
Place of publication
Petten