Investigation of Time-Variant Flow Angles Due to Shed Wakes in Turbomachines.
Abstract
This report focuses on the unsteady flow in compressors and turbines caused by shed wakes from upstream blade row airfoils as these wakes impinge on and change the inlet conditions for a downstream blade row. Three sets of experiments were available where wake measurements existed at several axial locations downstream of a moving blade row. At stations where a stator row might be located, variations in absolute flow angle on the order of 20 degrees above freestream were caused by wake passing. reduced frequency for stators in such situations is indicated to be in the range 3 to 12. The quantitative effects of wake produced incidence fluctuations of this nature have not been well defined by past research. A few tentative suggestions for compressor design to minimize these effects are, however, included. Keywords: axial flow compressors; axial flow turbines; unsteady flow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1985
- Accession Number
- ADA177454
Entities
People
- George K. Serovy
- J. D. Stampfli
Organizations
- Iowa State University