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POD Analysis of Entropy Generation in a Laminar Separation Boundary Layer

Author

Listed:
  • Chao Jin

    (School of Energy and Power Engineering, Beihang University, Beijing 100191, China)

  • Hongwei Ma

    (School of Energy and Power Engineering, Beihang University, Beijing 100191, China)

Abstract

Separation of laminar boundary layer is a great source of loss in energy and power machinery. This paper investigates the entropy generation of the boundary layer on the flat plate with pressure gradient. The velocity of the flow field is measured by a high resolution and time related particle image velocimetry (PIV) system. A method to estimate the entropy generation of each mode extracted by proper orthogonal decomposition (POD) is introduced. The entropy generation of each POD mode caused by mean viscous, Reynolds normal stress, Reynolds sheer stress, and energy flux is analyzed. The first order mode of the mean viscous term contributes almost 100% of the total entropy generation. The first three order modes of the Reynolds sheer stress term contribute less than 10% of the total entropy generation in the fore part of the separation bubble, while it reaches to more than 95% in the rear part of the separation bubble. It indicates that the more unsteady that the flow is, the higher contribution rate of the Reynolds sheer stress term makes. The energy flux term plays an important role in the turbulent kinetic energy balance in the transition region.

Suggested Citation

  • Chao Jin & Hongwei Ma, 2018. "POD Analysis of Entropy Generation in a Laminar Separation Boundary Layer," Energies, MDPI, vol. 11(11), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3003-:d:179955
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    Citations

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    Cited by:

    1. Zhenyang Zhang & Hongwei Ma, 2019. "Particle Image Velocimetry (PIV) Investigation of Blade and Purge Flow Impacts on Inter-Stage Flow Field in a Research Turbine," Energies, MDPI, vol. 12(7), pages 1-21, April.
    2. Artur J. Jaworski, 2019. "Special Issue “Fluid Flow and Heat Transfer”," Energies, MDPI, vol. 12(16), pages 1-4, August.
    3. Wenguo Luo & Yuqing Wei & Ke Dai & Jianfeng Zhu & Yancheng You, 2020. "Spatiotemporal Characterization and Suppression Mechanism of Supersonic Inlet Buzz with Proper Orthogonal Decomposition Method," Energies, MDPI, vol. 13(1), pages 1-23, January.

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