Developing and fully developed turbulent flow in ribbed channels

N. D. Cardwell, P. P. Vlachos, Karen Ann Thole

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    Modern turbomachines operate at combustion temperatures well beyond the incipient melting point of the turbine's metal components. Cooling channels within turbine airfoils directly affect component lifecycle in addition to influencing almost all aspects of the overall engine design. However, many aspects regarding flow structure and vortex dynamics within these cooling channels are still unknown. In this study, high fidelity Time Resolved Digital Particle Image Velocimetry (TRDPIV) was used to investigate a ribbed cooling channel. The design consisted of a square channel having square transverse ribs which were staggered on both the top and bottom walls. Rib spacing was matched to the channel height and the rib to channel height ratio was kept constant at 0.13. The Reynolds number range investigated was between 2,500 and 20,000. Flow field measurements were performed at the entrance to and within the developed rib roughened section, corresponding to the 1st and 12th ribs. Overall, the results indicate that large scale coherent vortical structures were generated by the presence of the front rib surface and enclosed wake region between the ribs. Higher values of vortex circulation strength were observed for Re=2,500 in addition to a more homogeneous distribution of identified coherent structures at the developed section. In addition to providing insight and feedback for a common turbine cooling design, this study also illuminates the vortex distribution for a highly turbulent and complex internal flow.

    Original languageEnglish (US)
    Title of host publication2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008
    Pages379-388
    Number of pages10
    Volume1
    EditionPART A
    DOIs
    StatePublished - 2009
    Event2008 ASME Fluids Engineering Division Summer Conference, FEDSM 2008 - Jacksonville, FL, United States
    Duration: Aug 10 2008Aug 14 2008

    Other

    Other2008 ASME Fluids Engineering Division Summer Conference, FEDSM 2008
    CountryUnited States
    CityJacksonville, FL
    Period8/10/088/14/08

    Fingerprint

    Turbulent flow
    Cooling
    Vortex flow
    Turbines
    Flow structure
    Airfoils
    Velocity measurement
    Melting point
    Flow fields
    Reynolds number
    Metals
    Engines
    Feedback
    Temperature

    All Science Journal Classification (ASJC) codes

    • Fluid Flow and Transfer Processes
    • Mechanical Engineering

    Cite this

    Cardwell, N. D., Vlachos, P. P., & Thole, K. A. (2009). Developing and fully developed turbulent flow in ribbed channels. In 2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008 (PART A ed., Vol. 1, pp. 379-388) https://doi.org/10.1115/FEDSM2008-55190
    Cardwell, N. D. ; Vlachos, P. P. ; Thole, Karen Ann. / Developing and fully developed turbulent flow in ribbed channels. 2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008. Vol. 1 PART A. ed. 2009. pp. 379-388
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    abstract = "Modern turbomachines operate at combustion temperatures well beyond the incipient melting point of the turbine's metal components. Cooling channels within turbine airfoils directly affect component lifecycle in addition to influencing almost all aspects of the overall engine design. However, many aspects regarding flow structure and vortex dynamics within these cooling channels are still unknown. In this study, high fidelity Time Resolved Digital Particle Image Velocimetry (TRDPIV) was used to investigate a ribbed cooling channel. The design consisted of a square channel having square transverse ribs which were staggered on both the top and bottom walls. Rib spacing was matched to the channel height and the rib to channel height ratio was kept constant at 0.13. The Reynolds number range investigated was between 2,500 and 20,000. Flow field measurements were performed at the entrance to and within the developed rib roughened section, corresponding to the 1st and 12th ribs. Overall, the results indicate that large scale coherent vortical structures were generated by the presence of the front rib surface and enclosed wake region between the ribs. Higher values of vortex circulation strength were observed for Re=2,500 in addition to a more homogeneous distribution of identified coherent structures at the developed section. In addition to providing insight and feedback for a common turbine cooling design, this study also illuminates the vortex distribution for a highly turbulent and complex internal flow.",
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    Cardwell, ND, Vlachos, PP & Thole, KA 2009, Developing and fully developed turbulent flow in ribbed channels. in 2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008. PART A edn, vol. 1, pp. 379-388, 2008 ASME Fluids Engineering Division Summer Conference, FEDSM 2008, Jacksonville, FL, United States, 8/10/08. https://doi.org/10.1115/FEDSM2008-55190

    Developing and fully developed turbulent flow in ribbed channels. / Cardwell, N. D.; Vlachos, P. P.; Thole, Karen Ann.

    2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008. Vol. 1 PART A. ed. 2009. p. 379-388.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    Cardwell ND, Vlachos PP, Thole KA. Developing and fully developed turbulent flow in ribbed channels. In 2008 Proceedings of the ASME Fluids Engineering Division Summer Conference, FEDSM 2008. PART A ed. Vol. 1. 2009. p. 379-388 https://doi.org/10.1115/FEDSM2008-55190