Output details

Far-field sound radiation due to an installed open rotor

Significance of output:

Contra-rotating open rotor engines may become viable propulsion systems for commercial aircraft, offering significant fuel efficiency savings compared to comparable turbofan engines. In turbofan engines, fan tone noise can be reduced by acoustically lining the nacelle. In the absence of a nacelle, tonal noise from open rotors is a key technical issue currently being researched (see http://www.rolls-royce.com/technology_innovation/research_programmes/gas_turbine_programmes/sage.jsp). This paper presents mathematical theory to predict tonal noise from open rotors installed on an airframe. The research was funded as part of the £5M UK Technology Strategy Board project SYMPHONY (System Manufacturing and Product design through component noise technology).