Enhanced mixing of a rectangular supersonic jet by natural and induced screech
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Enhanced mixing of a rectangular supersonic jet by natural and induced screech

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

Subjects:

  • Supersonic planes.

Book details:

Edition Notes

StatementEdward J. Rice and Ganesh Raman.
SeriesNASA technical memorandum -- 106245., NASA technical memorandum -- 106245.
ContributionsRaman, Ganesh., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL14701896M

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Enhanced mixing of multiple supersonic rectangular jets by synchronized screech. Instability modes excited by natural screech tones in a supersonic rectangular jets. Ganesh Raman and Advances in understanding supersonic jet screech. Ganesh Raman;. to reduce the internal mixing noise. Mixing enhancement of the supersonic jet flow from a converging-diverging rectangular nozzle operated at design pressure was obtained using paddles to induce screech and cause jet flapping. Seiner and Krejsa I have discussed the status of supersonic jet noise reduction relative to the supersonic Size: KB. A screech level variation of over 30 decibels was achieved and the mixing was completely determined by the level of screech attained at the nozzle lip. The second form of self-excitation used the induced screech caused by obstacles or paddles located in the shear layers on either long side of the rectangular : Edward J. Rice and Ganesh Raman. A unique set of data is presented on the effect of synchronized screech on the mixing of a linear array of underexpanded jets. Two other cases are provided for comparison. One case is the multijet array with suppressed screech and the other case is a single equivalent rectangular jet with screech.

  Rice EJ, Raman G () Enhanced mixing of a rectangular supersonic jet by natural and induced screech. AIAA shear flow conference, Orlando, United States, 6–9 July Samimy M, Kim JH, Clancy P, Martens S () Passive control of supersonic rectangular jets . A review of jet mixing enhancement for aircraft propulsion applications Show all authors. K Knowles 1. K Knowles T. D., Cain, A. B., Chenault, C. F. Numerical simulation of enhanced mixing in jet plumes using pulsed blowing Raman, G., Rice, E. J. Instability modes excited by natural screech tones in a supersonic rectangular jet. Phys. mixing performance than the rectangular jets in the subsonic and supersonic flow. n 1, k 2, on 3 conducted the experimental study of supersonic mixer nozzles in a co-flowing stream in the United Technologies Research Centre open jet acoustic wind tunnel. Enhancement of supersonic jet mixing plays a vital role in. The total noise spectrum from an incorrectly expanded jet flow contains discrete components (or screech) in addition to the basic turbulent mixing noise and the broadband shock-associated noise. In order to study the trends and dependencies of the broadband component accurately, it is vital to keep the contamination by screech to a minimum in.

The primary focus of this research project is on a particularly complex aeroacoustic process called “jet screech”. Screech is a closed-loop feedback process that operates as follows: A sound wave reaches the nozzle lip. Its arrival perturbs the edge of the jet, creating an instability in the jet shear layer. Rice EJ, Raman G () The role of natural and induced screech in the enhanced mixing of a rectangular supersonic jet. 45th Annual Meeting of the Division of Fluid Dynamics, APS, Tallahassee, Florida Google Scholar. E. J. RICE, G. RAMAN, , American Institute of Aeronautics and Astronautics Paper , Enhanced mixing of a rectangular supersonic jet by natural and induced screech . Abstract. Outline of presentation are: (1) Review of experimental apparatus. (2) Effect of natural screech of jet mixing; converging nozzle, underexpanded jet and converging-diverging nozzle, design pressure.(3) Effect of induced screech on jet mixing: produced by paddles in shear layers, similar to edge tones, and converging-diverging nozzle, design pressure.