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Development of a linearized unsteady Euler analysis for turbomachinery blade rowsA linearized unsteady aerodynamic analysis for axial-flow turbomachinery blading is described in this report. The linearization is based on the Euler equations of fluid motion and is motivated by the need for an efficient aerodynamic analysis that can be used in predicting the aeroelastic and aeroacoustic responses of blade rows. The field equations and surface conditions required for inviscid, nonlinear and linearized, unsteady aerodynamic analyses of three-dimensional flow through a single, blade row operating within a cylindrical duct, are derived. An existing numerical algorithm for determining time-accurate solutions of the nonlinear unsteady flow problem is described, and a numerical model, based upon this nonlinear flow solver, is formulated for the first-harmonic linear unsteady problem. The linearized aerodynamic and numerical models have been implemented into a first-harmonic unsteady flow code, called LINFLUX. At present this code applies only to two-dimensional flows, but an extension to three-dimensions is planned as future work. The three-dimensional aerodynamic and numerical formulations are described in this report. Numerical results for two-dimensional unsteady cascade flows, excited by prescribed blade motions and prescribed aerodynamic disturbances at inlet and exit, are also provided to illustrate the present capabilities of the LINFLUX analysis.
Document ID
19950024190
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Verdon, Joseph M. (United Technologies Research Center East Hartford, CT, United States)
Montgomery, Matthew D. (United Technologies Research Center East Hartford, CT, United States)
Kousen, Kenneth A. (United Technologies Research Center East Hartford, CT, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1995
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.26:4677
NASA-CR-4677
R95-970293
E-9575
Accession Number
95N30611
Funding Number(s)
CONTRACT_GRANT: NAS3-25425
PROJECT: RTOP 505-62-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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