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http://dx.doi.org/10.3795/KSME-B.2015.39.10.795

Flow Characteristics of the Boundary Layer Developing over a Turbine Blade Suction Surface  

Chang, Sung Il (Department of Mechanical Engineering, Kumoh National Institute of Technology)
Lee, Sang Woo (Department of Mechanical Engineering, Kumoh National Institute of Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.39, no.10, 2015 , pp. 795-803 More about this Journal
Abstract
The boundary layer developing over the suction surface of a first-stage turbine blade for power generation has been investigated in this study. For three locations selected in the region where local thermal load changes dramatically, mean velocity, turbulence intensity, and one-dimensional energy spectrum are measured with a hot-wire anemometer. The results show that the suction-surface boundary layer suffers a transition from a laminar flow to a turbulent one. This transition is confirmed to be a "separated-flow transition", which usually occurs in the shear layer over a separation bubble. The local minimum thermal load on the suction surface is found at the initiation point of the transition, whereas the local maximum thermal load is observed at the location of very high near-wall turbulence intensity after the transition process. Frequency characteristics of turbulent kinetic energy before and after the transition are understood clearly from the energy spectrum data.
Keywords
Turbine Blade; Suction Surface; Boundary Layer; Separated-Flow Transition; Energy Spectrum;
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