Data processing: structural design – modeling – simulation – and em – Simulating nonelectrical device or system – Fluid
Reexamination Certificate
1999-06-04
2003-11-25
Jones, Hugh M. (Department: 2123)
Data processing: structural design, modeling, simulation, and em
Simulating nonelectrical device or system
Fluid
C703S001000
Reexamination Certificate
active
06654710
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates a method for designing a flow device.
PRIOR ART
The documents cited in the References section of the present application describe related technologies.
1. Introduction and Discussion of Background
The present invention is related to the design and construction of flow devices and especially turbine and compressor blade channels.
In recent years substantial efforts have been made to introduce inverse design tools for airfoil, turbine blades and vane channel, and other flow devices for which the optimum combination of aerodynamic forces and losses plays a crucial role. For an adequate overview of the state of the art the reader is referred to work by Jameson et al. [3], Giles and Drela [4], Dang and Isgro [5], Dulikravich [6], Pandya and Baysal [7]. An overview of applications to current turbomachinery design is given by Jennions [8].
It should be understood that this list of publications on inverse design methods is far from complete. Furthermore, it should be mentioned that formulations of the Euler equations using two stream functions have been previously used (see Turner and Giles [9], for example). However, with the exception of genuine inverse methods (Keller et al. [10], [11]) that have been proposed for certain two-dimensional flows, the “inverse methods” that are presently used to arrive at an optimum design of three-dimensional flow devices are not really inverse. In general “Evolution Strategy”, genetic algorithms or simply Newton's method are used to guide an extensive series of flow calculations for gradually varying geometry toward some kind of optimum.
SUMMARY OF THE INVENTION
According to certain aspects of the present invention, a method for designing a flow device comprises the steps of (1) defining the physical properties of said flow device, and (2) deriving from said physical properties the corresponding geometry of said flow device by means of inverse flow equations.
Still other objects, features, and attendant advantages of the present invention will become apparent to those skilled in the art from a reading of the following detailed description of embodiments constructed in accordance therewith, taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5685696 (1997-11-01), Zangeneh et al.
patent: 0 962 874 (1999-12-01), None
patent: WO95/18419 (1995-07-01), None
Vasin, “The inverse problem of selecting a linearization coefficient for the Navier-Stokes equations with integral overdetermination”; Comp. Math. and Math. Physics; vol. 36, 1996, pp. 491-499.*
M.B. Giles and M. Drela, “Two-Dimensional Transonic Aerodynamic Design Method”, AIAA Journal vol. 25, No. 9, Sep. 1987, pp. 1199-1206.
R. Courand and K. O. Friedrichs, Supersonic flow and shock waves, Interscience, New York (1967) Table of contents only.
J.J. Ke;;er. A pair of stream functions for three dimensional vortex flows, Z. agnew, Math Phys. 47 (1996). 821.
A. Jameson, N.A. Pierce and L. Martinello, Optimum aerodynamic design using the Navier-Stokes equations, AIAA paper 97-0101, 35th Aerispace Sciences Meeting, Reno, Nevada 1997.
Dand and V. Isgro, Inverse method for turbomachine blades using existing time-marching techniques, ASME paper 94-GT-20, International Gas Turbine and Aeroengine Congress, The Hague, Netherlands, 1994.
G.S. Dulikravich, Shape inverse design and optimization for three-dimensional aerodynamics, AIAA paper 95-0695, 33rd Aerospace Science Meeting, Reno, Nevada, 1995.
M. J. Pandya and O. Baysal, Gradient-based aerodynamic shape optimization using ADI method for large scale problem, AIAA paper 96-0091, 34th Aerospace Sciences Meeting, Reno, Nevada, 1996.
I. K. Jennions, The role of CFD in the design process, AGARD Paper, 7 Rue Ancelle, 92200 Neuilly sur Seine, France, Lecture Series 195, May to Jun. 1994.
M. G. Turner and M. B. Giles, Design and analysis of internal flow fields using a two stream function formulation, ASME Winter Annual Meeting 1990, FED vol. 103, 203.
J. J. Keller, W. Egli, and J. Exley, Force-and loss-free transitions between flow states, Z. angew, Math Phys. 36 (1985), 854.
J.J. Keller, On the interpretation of vortex breakdown, Phys Fluids 7 (7), (1995), 1696.
J.J. Keller et al., Vortex Breakdown as a fundamental element of vortex dynamics, Journal of Applied Mathematics and Physics, vol. 39, pp. 404-440, May 1988.
S.J. Kline, et al., Optimum Design of Straight-Walled Diffusers, Journal of Basic Engineering, Sep. 1959, pp. 321-331.
“Inverse Euler Equations”, Keller, Math. Phys. 49 (1998), pp. 363-383.
“Inverse Method for Turbomachine Blades using Existing Time-Marching Techniques”, Dang, et al., ASME presentation, Jun. 1994.
“Optimum Aerodynamic Design using the Navier-Stokes Equations”, Jameson, et al., AIAA Inc. publication, pp. 1-21.
Keller Jakob
Keller-Schärli Maria A.
Alstom
Burns Doane Swecker & Mathis L.L.P.
Jones Hugh M.
Keller-Schärli Maria A.
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