Owing to their inherent fuel burn efficiency advantage compared with the current generation high bypass ratio turbofan engines, there is resurgent interest in developing open rotor propulsion systems for powering the next generation commercial aircraft. However, to make open rotor systems truly competitive, they must be made to be acoustically acceptable too. To address this challenge, NASA in collaboration with industry is exploring the design space for low-noise open rotor propulsion systems. The focus is on the system level assessment of the open rotors compared with other candidate concepts like the ultra high bypass ratio cycle engines. To that end there is an extensive research effort at NASA focused on component testing and diagnostics of the open rotor acoustic performance as well as assessment and improvement of open rotor noise prediction tools. In this presentation and overview of the current NASA research on open rotor noise will be provided. Two NASA projects, the Environmentally Responsible Aviation Project and the Subsonic Fixed Wing Project, have been funding this research effort.


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    NASA Open Rotor Noise Research

    Envia, Ed | NTRS | 2010


    Open Rotor Research at NASA Glenn

    VanZante, Dale E. | NTRS | 2011


    Open Rotor Research at NASA Glenn

    D. E. VanZante | NTIS | 2011


    Open Rotor Noise Prediction Methods at NASA Langley: A Technology Review

    Farassat, F. / Dunn, Mark / Tinetti, Ana et al. | AIAA | 2009


    NASA Jet Noise Research

    B. Henderson | NTIS | 2016