BVI Noise for the AH-1/OLS Model Rotor in Forward Flight, Taking into Account theRotor Stand in the DNW Wind Tunnel

摘要

This paper examines whether the rotor stand has to be taken into account in theBlade-vortex interaction (BVI) noise calculation for the AH-1/OLS model rotor tested in the DNW wind tunnel. The tests show that the presence of the stand changes the heights of the blade/vortex interactions from +0.2 to 0.5 chords, increases the retreating blade/wake interaction and the corresponding noise emission (+3 to 5 dB), but changes only slightly the noise emission corresponding to the advancing blade/wake interaction.