Power plants – Combustion products used as motive fluid – Combustion products generator
Reexamination Certificate
2005-05-18
2008-08-26
Casaregola, L. J. (Department: 3746)
Power plants
Combustion products used as motive fluid
Combustion products generator
C239S433000, C239S568000, C239S598000
Reexamination Certificate
active
07415827
ABSTRACT:
In an air mixing arrangement wherein a primary fluid is introduced through an opening in a wall to be mixed with a secondary fluid flowing along the wall surface, the opening is airfoil shaped with its leading edge being orientated at an attack angle with respect to the secondary fluid flow stream so as to thereby enhance the penetration and dispersion of the primary fluid stream into the secondary fluid stream. The airfoil shaped opening is selectively positioned such that its angle of attack provides the desired lift to optimize the mixing of the two streams for the particular application. In one embodiment, a collar is provided around the opening to prevent the secondary fluid from contacting the surface of the wall during certain conditions of operation. Multiple openings maybe used such as the combination of a larger airfoil shaped opening with a smaller airfoil shaped opened positioned downstream thereof, or a round shaped opening placed upstream of an airfoil shaped opening. Pairs of openings and associated collars maybe placed in symmetric relationship so as to promote mixing in particular applications, and nozzles maybe placed on the inner side of wall to enhance the flow characteristics of the primary fluid.
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Article entitled “Optimum Mixing for a Two-Sided Injection from Opposing Rows of Staggered Jets Into a Confined Crossflow” by Malte M. Blomeyer, Bernd H. Krautkremer, Dietmar K. Hennecke from The American Society of Mechanical Engineers, Copyright © 1996 by ASME 96-GT-453.
Article entitled “Vortex induction and mass entrainment in a small-aspect-ratio elliptic jet” by Chih-Ming Ho and Ephraim Gutmark, J. Fluid Mech (1987) col. 179, pp. 383 405.
Article entitled “Flow Control With Noncircular Jets” by E.J. Gutmark, F.F. Grinstein, Ann. Rev. Fluid Mech, 1999, pp. 239-272.
XP-002404952—Database Compendex (Online) Engineering Information, Inc., New York, NY, Kroll J. T. et al. “Optimization of Orifice Geometry for Crossflow Mixing in a Cylindrical Duct”.
XP-000937219—Schiel, R. et al., “Gas Turbine Heat Transfer: Past and Future Challenges”, Journal of Propulsion and Power, Americal Institute of Aeronautics and Astranautics, New York, US, pp. 583-589.
Bertolotti Fabio P.
Liscinsky David S.
Sabatino Daniel R.
Casaregola L. J.
Marjama Muldoon Blasiak & Sullivan LLP
United Technologies Corporation
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