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Analysis of Multistage, Axial Flow Turbomachine Wake Production, Transport, and Interaction.
Interim rept. 1 Oct 76-30 Sep 77,
IOWA STATE UNIV AMES ENGINEERING RESEARCH INST
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A periodic-average flow measurement technique involving a hot-wire anemometer system was used to measure the periodically unsteady and three-dimensional fluid velocity field between blade rows in the first stage of a low-speed, multistage, axial-flow research compressor. These data suggest that the fluid flow through the imbedded rotor and stator rows is appreciably unsteady, in a periodic fashion in portions of the compressor annulus. Illustrative examples of periodic-average fluid flow field variation with rotor blade sampling postition in stop-action sequence are presented for different locations in the compressor. A simple, first order approximation physical description of the blade wake flow transport and interaction process largely based on experimental data interpretation is proposed to organize and to help explain the observations made. Blade span variations of flow data reflect end-wall effects. Inlet guide vane exit flow data involve some unusual unsteady flow effects. Author
APPROVED FOR PUBLIC RELEASE