Reducing jet noise using resolvent-based sensitivities
ORAL
Abstract
To increase community acceptance of forthcoming supersonic civilian jet transports, we develop a resolvent-based technique to reduce the take-off radiated noise from their low-bypass-ratio turbofan engines with near-sonic exit velocities. Linear resolvents are shown to be sensitive to the jet exhaust properties and to the exhaust nozzle design. A method to directly connect changes in the resolvent to changes in the exhaust properties and the nozzle design and is developed and demonstrated on dual stream near-sonic jets that have been tested experimentally. Both cold and heated jets are considered. The presentation will include the details of the resolvent-based method, its application to RANS-predicted jet mean flows, noise reduction estimates compared to experimental measurements, and conclude with integration details into a nozzle design optimization process.
*This research was funded by the U.S. Federal Aviation Administration Office of Environment and Energy through ASCENT, the FAA Center of Excellence for Alternative Jet Fuels and the Environment, project 59 through FAA Award Number 13-C-AJFE-UI (Amendment 31) under the supervision of Sandy Liu. Any opinions, findings, conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the FAA.
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Presenters
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SANDEEP RAVIKUMAR MURTHY
- University of Illinois at Urbana-Champaign