NDLI: Measurements of the unsteady flow field within the stator row of a transonic axial-flow fan. 1: measurement and analysis technique

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Measurements of the unsteady flow field within the stator row of a transonic axial-flow fan. 1: measurement and analysis technique

Content Provider	NASA Technical Reports Server (NTRS)
Author	Strazisar, A. J. Okiishi, T. H. Adamczyk, J. J. Hathaway, M. D. Suder, K. L.
Copyright Year	1987
Description	This two-part paper presents laser anemometer measurements of the unsteady velocity field within the stator row of a transonic axial-flow fan. The objective is to provide additional insight into unsteady blade-row interactions within high speed compressors which affect stage efficiency, energy transfer, and other design considerations. Part 1 describes the measurement and analysis techniques used for resolving the unsteady flow field features. The ensemble-average and variance of the measured velocities are used to identify the rotor wake generated and unresolved unsteadiness, respectively. (Rotor wake generated unsteadiness refers to the unsteadiness generated by the rotor wake velocity deficit and the term unresolved unsteadiness refers to all remaining contributions to unsteadiness such as vortex shedding, turbulence, mass flow fluctuations, etc.). A procedure for calculating auto and cross correlations of the rotor wake generated and unresolved unsteady velocity fluctuations is described. These unsteady-velocity correlations have significance since they also result from a decomposition of the Navier-Stokes equations. This decomposition of the Navier-Stokes equations resulting in the velocity correlations used to describe the unsteady velocity field will also be outlined in this paper.
File Size	842390
Page Count	18
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870007356
Archival Resource Key	ark:/13960/t10p5z750
Language	English
Publisher Date	1987-01-01
Access Restriction	Open
Subject Keyword	Aerodynamics Turbocompressors Turbulence Vortex Shedding Turbine Blades Transonic Compressors Unsteady Flow Laser Anemometers Compressor Rotors Turbofans Flow Distribution Wakes Stators Axial Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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