FUNDAMENTAL NOISE
NASA GLENN RESEARCH CENTER
Loretta Shaw, Subsonic Systems OfficeDennis Huff, Acoustic Branch Chief
Propulsion Systems Program
Aerospace Propulsion and Power Base Program
Objective: Develop advanced concepts to reduce subsonic engine fan, jet and core noise.
Fundamental Noise
Propulsion Fundamentals Research Project
Objective: …to provide support for new high-risk, high-payoffactivities that are of long term strategic importance
Propulsion Systems Program
Aeroacoustic Propulsion Laboratory
• Jet Noise Experiments - Provide fundamental insight into physics of jet noise generation and propagation
Aerospace Propulsion and Power Base Program
Propulsion Systems Program
Fundamental Noise Approach in FY00
Small Hot Acoustic Jet Rig
• Fan Noise Prediction- Develop the next generation fan noise prediction tools
based on Computational Aeroacoustics
• Jet Noise Prediction- Develop next generation jet noise prediction tools based on modeling and Computational Aeroacoustics
MGBKprediction
Data
ï Micro-blown Acoustic Aft-duct Splitter - Demonstrate the reduction of skin friction and aft duct fan noise with a micro-blown aft duct splitter
Aerospace Propulsion and Power Base Program
Propulsion Systems Program
Fundamental Noise Approach in FY00 Continued
ï 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
ï Active Control of Fan Broadband Noise- Develop a technique to actively control fan broadband noise
Source cross-correlation studies