Abstract
The purpose of this study is to research the effect of Silent Disrupter Blade (SD-Blade) on numerical analysis. It is one of noise reduction technologies for small wind turbines and has protrusions made by painting along the wing chord like a riblet. The effect of SD-Blade is known in experiments, but its detail mechanism doesn't become clear. In this research, the flow field is simulated using compressible Large-Eddy Simulation (LES) and the acoustic field is evaluated by BPM model. The study compares SD-Blade with normal blade using LES and BPM. The results of SD-Blade shows decreasing Sound Pressure Level (SPL) and increasing lift-drag ratio compared to normal blade. Besides, from the looking of the flow field, we can confirm that the protrusions reduce flows of span-wise direction in boundary layer.
