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Prediction of Turbulent Jet Mixing Noise Reduction by Water InjectionA one-dimensional control volume formulation is developed for the determination of jet mixing noise reduction due to water injection. The analysis starts from the conservation of mass, momentum and energy for the confrol volume, and introduces the concept of effective jet parameters (jet temperature, jet velocity and jet Mach number). It is shown that the water to jet mass flow rate ratio is an important parameter characterizing the jet noise reduction on account of gas-to-droplet momentum and heat transfer. Two independent dimensionless invariant groups are postulated, and provide the necessary relations for the droplet size and droplet Reynolds number. Results are presented illustrating the effect of mass flow rate ratio on the jet mixing noise reduction for a range of jet Mach number and jet Reynolds number. Predictions from the model show satisfactory comparison with available test data on perfectly expanded hot supersonic jets. The results suggest that significant noise reductions can be achieved at increased flow rate ratios.
Document ID
20130011511
Document Type
Preprint (Draft being sent to journal)
Authors
Kandula, Max (NASA Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
August 27, 2013
Publication Date
January 1, 2008
Publication Information
Publication: AIAA Journal
Volume: 46
Issue: 11
Subject Category
Acoustics
Report/Patent Number
KSC-2008-200
Funding Number(s)
CONTRACT_GRANT: NAS10-03006
Distribution Limits
Public
Copyright
Public Use Permitted.

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