This paper presents aeroacoustic data from the HERA rig (HElices RApides), measured during a 2012 wind tunnel test campaign in DNW's Large Low-speed Facility (LLF). This campaign dealt with two different Snecma blade geometries: a baseline aero-mechanical design, and a subsequent low noise aeroacoustic design, both derived from the DREAM European program (FP7) studies on blade optimization. In order to assess the benefits of the new generation blade design, back to back comparisons of the far field noise of both geometries are carried out, thanks to inflow and out-of-flow acoustic measurements. A variety of blade pitch settings have been tested for the aeroacoustic geometry, for different Mach numbers, rotational speeds and angles of attack. In order to partially reproduce a rear-fuselage pusher engine configuration, an Airbus pylon has been installed upstream of the front rotor. The effects of this pylon representative of an aircraft installation and of its associated trailing edge blowing technology are assessed. The results highlight the pylon blowing efficiency to reduce the pylon-rotor interaction noise. This investigation is carried out with the advanced Snecma blade design and an improved Airbus pylon that takes into account actual aircraft installation constraints.
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