Research in the fundamental aspects of aeroacoustics is a key component related to reduction of jet noise, among other technology goals. In the anechoic chamber facility, both single and coaxial flows are studied to provide realistic results for gas turbine engine exhaust acoustics. The studies performed have included investigations into the role of various physical mechanisms on flow sound radiation, including instability waves and reconstruction of jet modes using LSE. Practical evaluation and innovation in propulsion system

exhaust noise is an equally important research activity. Through prior experience and industry partnerships, the development and testing of both passive and active noise reduction schemes has produced results that have advanced the current capabilities in noise reduction. As a complement to understanding the effect of complex geometry and associated flows on radiated acoustics, LES CFD along with CAA is employed to more fully characterize the acoustic sources and predict the acoustic performance of new noise reduction concepts.

  • Proof of concept for using LSE (Linear Stochastic Estimation) and POD (Proper Orthogonol Decomposition) for free jet reconstruction
  • Chevron nozzle development and characterization with GEAE & NASA
  • Patents on flexible filaments nozzle for noise reduction
  • Shock cell noise reduction using chevrons
  • Development of SMA (shape memory alloy) concepts
  • Development and proof of concept for using fluidic injection
  • GEAE
  • NASA
  • GE/GRC
  • DOD
Ephraim Gutmark
Gas Dynamics and Propulsion Laboratory
University of Cincinnati
Dept. of Aerospace Engineering and Engineering Mechanics
300 Rhodes Hall
Cincinnati, OH 45221-0070
© 2005 University of Cincinnati