Experimental Investigation on Facing Rim Cavities by Filling Treatments

An experiment on a 1/2 scaled simplified nose landing gear configuration of the LAGOON project is conducted in D5 aero-acoustic wind tunnel with the aim to explore the mechanism of the tonal noise generated by the facing rim cavities in the inner wheel. In the experiment, the geometry of facing rim cavity is changed by using poly foam to fill the inner wheel cavity. There are three configurations: conf. BS, conf. NC and conf. HC. For conf. BS, three tones are generated by facing rim cavities. Comparing with conf. HC and conf. NC, it is concluded that the generation mechanism of the first two tones is preferred to be a fluid resonant phenomenon, whereas, the third tone is more like to be governed by the coupling effect between acoustic resonant and Rossiter type.