Separating oscillating and pulsating flows in an internal adverse pressure gradient geometry are studied experimentally. Time-resolved PIV measurements and simultaneous pressure measurements reveal that, in oscillating flow, during the accelerating portion of the cycle, the flow remains attached in spite of a very large adverse pressure gradient. During the decelerating portion of the cycle, the flow is more prone to separation. The duration and extent of the separation depend strongly on the oscillation displacement amplitude relative to the cross-stream dimension. In some cases, the flow separates but reattaches as the separated shear layer is accelerated temporally. The time-varying pressure measurements are used to determine the resultant minor losses for the flow in each direction. These are found to be an increasing function of displacement amplitude and a decreasing function of the Reynolds number and can be greater than or less than those for steady flow. Pressure and velocity measurements are presented for pulsating flow with various DC components.
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ASME/JSME 2007 5th Joint Fluids Engineering Conference
July 30–August 2, 2007
San Diego, California, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4288-6
PROCEEDINGS PAPER
Time-Resolved PIV and Pressure Measurements of Oscillating and Pulsating Flow in a Rapid Expansion
Barton L. Smith,
Barton L. Smith
Utah State University, Logan, UT
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Cameron V. King
Cameron V. King
Utah State University, Logan, UT
Search for other works by this author on:
Barton L. Smith
Utah State University, Logan, UT
Cameron V. King
Utah State University, Logan, UT
Paper No:
FEDSM2007-37257, pp. 1223-1232; 10 pages
Published Online:
March 30, 2009
Citation
Smith, BL, & King, CV. "Time-Resolved PIV and Pressure Measurements of Oscillating and Pulsating Flow in a Rapid Expansion." Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference. Volume 1: Symposia, Parts A and B. San Diego, California, USA. July 30–August 2, 2007. pp. 1223-1232. ASME. https://doi.org/10.1115/FEDSM2007-37257
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