NDLI: Averaging techniques for steady and unsteady calculations of a transonic fan stage

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Averaging techniques for steady and unsteady calculations of a transonic fan stage

Content Provider	NASA Technical Reports Server (NTRS)
Author	Chima, R. V. Wyss, M. L. Tweedt, D. L.
Copyright Year	1993
Description	It is often desirable to characterize a turbomachinery flow field with a few lumped parameters such as total pressure ratio or stage efficiency. Various averaging schemes may be used to compute these parameters. The momentum, energy, and area averaging schemes are described and compared. The schemes were compared for two computed solutions of the midspan section of a transonic fan stage: a steady averaging-plane solution in which average rotor outflow conditions were used as stator inflow conditions, and an unsteady rotor-stator interaction solution. The solutions were computed on identical grids using similar Navier-Stokes codes and an algebraic turbulence model. The unsteady solution is described, some unsteady flow phenomena are discussed, and the steady pressure distributions are compared. Despite large unsteady pressure fluctuations on the stator surface, the steady pressure distribution matched the average unsteady distribution almost exactly. Stator wake profiles, stator loss coefficient, and stage efficiency were computed for the two solutions with the three averaging schemes and are compared. In general, the energy averaging scheme gave good agreement between the averaging-plane solution and the time-averaged unsteady solution, even though certain phenomena due to unsteady wake migration were neglected.
File Size	956417
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940008635
Archival Resource Key	ark:/13960/t1sf7pm53
Language	English
Publisher Date	1993-07-01
Access Restriction	Open
Subject Keyword	Aeronautics (general) Navier-stokes Equation Computational Fluid Dynamics Turbulence Models Rotors Steady Flow Rotor Stator Interactions Flow Distribution Pressure Distribution Stators Turbomachinery Mathematical Models Unsteady Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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