A reduced order model of unsteady flows in turbomachinery
- Duke Univ., Durham, NC (United States). Dept. of Mechanical Engineering and Materials Science
- Raytheon Co., Marlborough, MA (United States)
A novel technique for computing unsteady flows about turbomachinery cascades is presented. Starting with a frequency domain CFD description of unsteady aerodynamic flows, the authors form a large, sparse, generalized, non-Hermititan eigenvalue problem that describes the natural modes and frequencies of fluid motion about the cascade. They compute the dominant left and right eigenmodes and corresponding eigenfrequencies using a Lanczos algorithm. Then, using just a few of the resulting eigenmodes, they construct a reduced order model of the unsteady flow field. With this model, one can rapidly and accurately predict the unsteady aerodynamic loads acting on the cascade over a wide range of reduced frequencies and arbitrary modes of vibration. Moreover, the eigenmode information provides insights into the physics of unsteady flows. Finally they note that the form of the reduced order model is well suited for use in active control of aeroelastic and aeroacoustic phenomena.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 103648
- Report Number(s):
- CONF-940626-; ISSN 0889-504X; TRN: IM9541%%87
- Journal Information:
- Journal of Turbomachinery, Vol. 117, Issue 3; Conference: 39. international gas turbine and aeroengine congress and exposition, The Hague (Netherlands), 13-16 Jun 1994; Other Information: PBD: Jul 1995
- Country of Publication:
- United States
- Language:
- English
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