Experimental Research on Noise Reduction for Realistic Landing Gear Geometries

An experimental study of noise reduction methods has been carried out for realistic small-scale (1 : 10) models of aircraft landing gear based on two ideas: (1) the useful interference of turbulent wake sources and reflected sources induced by them, effected by changing the geometry of the legs/struts, and (2) direct reduction of source intensity in a turbulent wake by mounting a fairing on the wheel assembly. The mutual complementarity of these methods in different frequency ranges is demonstrated. The influence of the yaw angle on the effectiveness of these noise reduction methods is also studied. Their applicability to large-scale models is analyzed.