Swirl Number Selection for Reduction of Various Forms of Jet Noise
Categories for this Invention
Technology: Jet noise suppressor in a jet engine;
Industry/Application: Automotive Industry; Aerospace, Aircraft Engine; Jet engine,
Market: The global jet engines market is projected to reach at a CAGR of 7.8% during the forecast period (2024-32).
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Problem Statement
- The problem statement discussed in the present invention is how to suppress/reduces the significant noise in the jet engines in effective manner.
- Hence, subject invention addresses the issue in efficient manner.
Technology
- Present patent describes a device and method for reducing jet noise using co-axial flat/helix curve vane swirler for various swirl numbers.  Â
- The method comprising the steps of:
- A jet noise suppressor in a jet engine having a jet center longitudinal axis, comprising of :
- a nozzle, a downstream end to discharge engine flow and a co-axial vane swirler of a suitable swirl number before the downstream end, wherein the swirl number (S) may be determined by the equation.
- The number of vanes may be six and or less than or more than six.
Key Features / Value Proposition
- The co-axial swirl device enhances the mixing between the jet fluid and surrounding ambient fluid and reduce or enhance the noise levels depending on the vane angles / swirl numbers.
- Enhancement of the mixing and spread rates from the co-axial swirl device causes to mitigates the shock associated noise levels and complete elimination of screech ton.
- The main jet noise sources turbulent mixing noise, shock associated noise, screech tones, mach wave radiations are mitigated by the claimed device.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof, K. Srinivasan
Department of Mechanical Engineering
Intellectual Property
IITM IDF Ref. 1350
IN Patent No. 454509 (Granted)
Technology Readiness Level
TRL-4
Technology validated in Laboratory