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.
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

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