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FUNDAMENTAL NOISE NASA GLENN RESEARCH CENTER Loretta Shaw, Subsonic Systems Office

Propulsion Systems Program. FUNDAMENTAL NOISE NASA GLENN RESEARCH CENTER Loretta Shaw, Subsonic Systems Office Dennis Huff, Acoustic Branch Chief. Propulsion Systems Program. Aerospace Propulsion and Power Base Program. Propulsion Fundamentals Research Project.

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FUNDAMENTAL NOISE NASA GLENN RESEARCH CENTER Loretta Shaw, Subsonic Systems Office

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  1. Propulsion Systems Program FUNDAMENTAL NOISE NASA GLENN RESEARCH CENTER Loretta Shaw, Subsonic Systems Office Dennis Huff, Acoustic Branch Chief

  2. Propulsion Systems Program Aerospace Propulsion and Power Base Program Propulsion Fundamentals Research Project Objective: …to provide support for new high-risk, high-payoff activities that are of long term strategic importance Fundamental Noise Objective:Develop advanced concepts to reduce subsonic engine fan, jet and core noise. Aeroacoustic Propulsion Laboratory

  3. Propulsion Systems Program Aerospace Propulsion and Power Base Program Fundamental Noise Approach in FY00 • Jet Noise Experiments • - Provide fundamental insight into physics of jet noise • generation and propagation Small Hot Acoustic Jet Rig • Jet Noise Prediction • - Develop next generation jet noise prediction tools based on • modeling and Computational Aeroacoustics MGBK prediction Data • Fan Noise Prediction • - Develop the next generation fan noise prediction tools • based on Computational Aeroacoustics

  4. Propulsion Systems Program Aerospace Propulsion and Power Base Program Fundamental Noise Approach in FY00 Continued • Micro-blown Acoustic Aft-duct Splitter • - Demonstrate the reduction of skin friction and aft duct fan noise with a micro-blown • aft duct splitter • Active Control of Fan Broadband Noise • - Develop a technique to actively control fan broadband noise Source cross-correlation studies • Advanced Fan Noise Reduction Concept • - Design a 2-staged low tip speed fan with swept stator vanes and synchrophased fans to obtain active noise cancellation

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