Sound from Propeller Slipstream-Landing Gear Interaction

As noise emitted from propulsion systems diminishes, secondary sources may contribute to fly-over noise. One potential source is the interaction of the propeller tip vortices with an extended landing gear. In order to access... [ view full abstract ]

As noise emitted from propulsion systems diminishes, secondary sources may contribute to fly-over noise. One potential source is the interaction of the propeller tip vortices with an extended landing gear. In order to access the relative strength of the interaction noise, a preliminary scale model study was undertaken at the refurbished anechoic wind tunnel at the University of Toronto Institute for Aerospace Studies (UTIAS). The project team comprised Aercoustics Engineering Limited (AEL), UTIAS and Bombardier Aerospace (BA) and GARDN provided partial financial support. AEL addressed the development of a semi-empirical prediction model while UTIAS performed the acoustic testing using a microphone array provided by BA. The paper reviews the challenges posed by scale model testing and presents measured data and a prediction scheme for a conventional single strut main landing gear typical of a modern turbo-prop aircraft.