Power plants – Reaction motor – Particular exhaust nozzle feature
Reexamination Certificate
2007-07-10
2007-07-10
Rodriguez, William H. (Department: 3746)
Power plants
Reaction motor
Particular exhaust nozzle feature
C239S265110
Reexamination Certificate
active
10999449
ABSTRACT:
A method and device to reduce the noise produced by jet aircraft engines and/or other supersonic nozzles involves the use of corrugated engine seals (30) for the secondary internal divergent flaps (14) of the nozzle (10). Such corrugated seals (30) serve not only to eliminate shock-generated noise, but also generate a counter-rotating vorticity to force low speed mixing of surrounding ambient air with the high-speed jet exhaust. Lower exhaust velocities, combined with reduced levels of the turbulent Reynolds shear stress, lead to reduction of turbulence-generated noise, including Mach wave emission.
REFERENCES:
patent: 2801516 (1957-08-01), Battle et al.
patent: 2972226 (1961-02-01), Geary
patent: 2984068 (1961-05-01), Eatock
patent: 2999354 (1961-09-01), Gallo et al.
patent: 3184917 (1965-05-01), Caouette et al.
patent: 3251553 (1966-05-01), Fitton et al.
patent: 3892358 (1975-07-01), Gisslen
patent: 3979065 (1976-09-01), Madden
patent: 3982696 (1976-09-01), Gordon
patent: 4066214 (1978-01-01), Johnson
patent: 4077206 (1978-03-01), Ayyagari
patent: 4081137 (1978-03-01), Sutton et al.
patent: 4117671 (1978-10-01), Neal et al.
patent: 4422524 (1983-12-01), Osborn
patent: 4487017 (1984-12-01), Rodgers
patent: 4878618 (1989-11-01), Hufnagel
patent: 4994660 (1991-02-01), Hauer
patent: 5039014 (1991-08-01), Lippmeier
patent: 5120005 (1992-06-01), Reedy
patent: 5215256 (1993-06-01), Barcza
patent: 5232158 (1993-08-01), Barcza
patent: 5261605 (1993-11-01), McLafferty et al.
patent: 5269467 (1993-12-01), Williams et al.
patent: 5285637 (1994-02-01), Barcza
patent: 5437411 (1995-08-01), Renggli
patent: 5484105 (1996-01-01), Ausdenmoore et al.
patent: 5485959 (1996-01-01), Wood et al.
patent: 5667140 (1997-09-01), Johnson et al.
patent: 5683034 (1997-11-01), Johnson et al.
patent: 5713522 (1998-02-01), Lundberg
patent: 5771681 (1998-06-01), Rudolph
patent: 5797544 (1998-08-01), Ward
patent: 6082635 (2000-07-01), Seiner et al.
patent: 6347510 (2002-02-01), McAlice et al.
patent: 6626440 (2003-09-01), Halling
patent: 6968615 (2005-11-01), More et al.
patent: 7032835 (2006-04-01), Murphy et al.
Grosch, et al., “Numerical Simulation of Mixing Enhancement In a Hot Supersonic Jet”, Physics of Fluids, 1997, vol. 9, Part 4, pp. 1125-1143.
Liepman, et al., “Elements of Gasdynamics,” Dover Publications, Inc., Mineola, New York; 1985, pp. 284-304.
Seiner, et al., “Mach Wave Emission From a High Temperature Supersonic Jet,” AIAA J., 1994; vol. 32, No. 12, pp. 2345-2350.
Myers, Jr. Richard S.
Rodriguez William H.
Stites & Harbison PLLC
The University of Mississippi
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