Flow measurements were made on a highly loaded low pressure turbine blade in a low-speed linear cascade facility. The blade has a design Zweifel coefficient of 1.34 with a peak pressure coefficient near 47% axial chord (midloaded). Flow and surface pressure data were taken for with 3% inlet freestream turbulence. For these operating conditions, a large separation bubble forms over the downstream portion of the blade suction surface, extending from 59% to 86% axial chord. Single-element hot-film measurements were acquired to clearly identify the role of boundary layer transition in this separated region. Higher-order turbulence statistics were used to identify transition and separation zones. Similar measurements were also made in the presence of unsteady forcing using pulsed vortex generator jets just upstream of the separation bubble (50% ). Measurements provide a comprehensive picture of the interaction of boundary layer transition and separation in this unsteady environment. Similarities between pulsed flow control and unsteady wake motion are highlighted.
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April 2008
Research Papers
Separated Flow Transition on an LP Turbine Blade With Pulsed Flow Control
Jeffrey P. Bons,
Jeffrey P. Bons
Department of Mechanical Engineering,
Brigham Young University
, Provo, UT 84602
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Daniel Reimann,
Daniel Reimann
Department of Mechanical Engineering,
Brigham Young University
, Provo, UT 84602
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Matthew Bloxham
Matthew Bloxham
Department of Mechanical Engineering,
Brigham Young University
, Provo, UT 84602
Search for other works by this author on:
Jeffrey P. Bons
Department of Mechanical Engineering,
Brigham Young University
, Provo, UT 84602
Daniel Reimann
Department of Mechanical Engineering,
Brigham Young University
, Provo, UT 84602
Matthew Bloxham
Department of Mechanical Engineering,
Brigham Young University
, Provo, UT 84602J. Turbomach. Apr 2008, 130(2): 021014 (8 pages)
Published Online: March 21, 2008
Article history
Received:
September 1, 2006
Revised:
November 14, 2006
Published:
March 21, 2008
Citation
Bons, J. P., Reimann, D., and Bloxham, M. (March 21, 2008). "Separated Flow Transition on an LP Turbine Blade With Pulsed Flow Control." ASME. J. Turbomach. April 2008; 130(2): 021014. https://doi.org/10.1115/1.2751149
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