Segmented mixing device for jet engines and aircraft

Details Segmented mixing device for jet engines and aircraft Segmented mixing device for jet engines and aircraft

2006-06-27

2006-06-27

Freay, Charles G. (Department: 3746)

Power plants

Reaction motor

Method of operation

C060S226100, C060S262000, C060S264000, C239S265190, C181S220000, C244S03500A, C244S211000

Reexamination Certificate

active

07065957

ABSTRACT:
Disclosed is a means for reducing jet engine exhaust noise wherein mixing is enhanced between adjacent exhaust flows and between exhaust flow and free-stream flow. Also disclosed is a means for improving the thrust of jet engines and for reducing the noise and drag of aircraft. The device is a segmented, triangular or trapezoidal shaped, curved extension to a nozzle's sleeve or surface trailing edge that results in a serrated trailing edge. The extensions enhance the natural free mixing of the adjacent flows and therefore reduce the acoustic energy associated with the velocity differences between the streams in which they are imbedded. The novel structure forces adjacent flows to penetrate into one another to a greater depth than that achieved with free mixing and results in a more uniform flow in a shorter stream wise distance. As a result of the enhanced mixing, drag on flow surfaces that are downstream of the devices and are scrubbed by the flows adjacent to the devices can be reduced.

REFERENCES:
patent: 2800291 (1957-07-01), Stephans
patent: 3153319 (1964-10-01), Young et al.
patent: 3578264 (1971-05-01), Kuethe
patent: 4311291 (1982-01-01), Gilbertson et al.
patent: 5088665 (1992-02-01), Vijgen et al.
patent: 6786037 (2004-09-01), Balzer
patent: 2002/0125340 (2002-09-01), Birch et al.
patent: 2003/0159428 (2003-08-01), Hebert
patent: 354098000 (1979-08-01), None
D.C. Kenzakowski, J. Shipman, S.M. Dash, J.E. Bridges and N. H. Saiyed, “Turbulence Model Study of Laboratory Jets with Mixing Enhancements for Noise Reduction,” AIAA-2000-0219, Jan. 2000.

Affiliated with

Also associated with

Rating

Segmented mixing device for jet engines and aircraft does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Segmented mixing device for jet engines and aircraft, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Segmented mixing device for jet engines and aircraft will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3637826