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Measurements of the unsteady flow field within the stator row of a transonic axial-flow fan. 1: Measurement and analysis techniqueThis 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.
Document ID
19870007356
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Suder, K. L. (NASA Lewis Research Center Cleveland, OH, United States)
Hathaway, M. D. (Army Research and Technology Labs. Cleveland, Ohio, United States)
Okiishi, T. H. (Iowa State Univ. of Science and Technology, Ames., United States)
Strazisar, A. J. (NASA Lewis Research Center Cleveland, OH, United States)
Adamczyk, J. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1987
Subject Category
Aerodynamics
Report/Patent Number
E-3393
USAAVSCOM-TR-86-C-30
NASA-TM-88945
NAS 1.15:88945
Accession Number
87N16789
Funding Number(s)
PROJECT: RTOP 505-62-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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