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Numerical Investigation on Backward-Injection Film Cooling with Upstream Ramps

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  • Shengchang Zhang

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Chunhua Wang

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Xiaoming Tan

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Jingzhou Zhang

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Jiachen Guo

    (College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
    School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK)

Abstract

The present study investigates the effects of upstream ramps on a backward-injection film cooling over a flat surface. Two ramp structures, referred to as a straight-wedge-shaped ramp (SWR) and sand-dune-shaped ramp (SDR), are considered under a series of blowing ratios ranging from M = 0.5 to M = 1.5. Regarding the backward injection, the key mechanism of upstream ramps on film cooling enhancement is suggested to be the enlargement of the horizontal scale of the separate wake vortices and the reduction of their normal dimension. When compared to the SDR, the SWR modifies the backward coolant injection well, such that a larger volume of coolant is suctioned and concentrated in the near-field region at the film-hole trailing edge. As a consequence, the SWR demonstrates a more pronounced enhancement in film cooling than the SDR in the backward-injection process, which is the opposite of the result for the forward-injection scheme. For the SWR, the backward injection provides a better film cooling effectiveness than the forward injection, regardless of blowing ratios. However, for the SDR, the backward injection could show a superior effect to the forward injection on film cooling enhancement, when the blowing ratio is beyond a critical blowing ratio. In the present SDR situation, the critical blowing ratio is identified to be M = 1.0.

Suggested Citation

  • Shengchang Zhang & Chunhua Wang & Xiaoming Tan & Jingzhou Zhang & Jiachen Guo, 2022. "Numerical Investigation on Backward-Injection Film Cooling with Upstream Ramps," Energies, MDPI, vol. 15(12), pages 1-20, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4415-:d:841100
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    References listed on IDEAS

    as
    1. Yoon Seong Jeong & Jun Su Park, 2020. "Effect of Inlet Compound Angle of Backward Injection Film Cooling Hole," Energies, MDPI, vol. 13(4), pages 1-11, February.
    2. Jin Hang & Jingzhou Zhang & Chunhua Wang & Yong Shan, 2022. "Numerical Investigation of Single-Row Double-Jet Film Cooling of a Turbine Guide Vane under High-Temperature and High-Pressure Conditions," Energies, MDPI, vol. 15(1), pages 1-22, January.
    3. Seung-Il Baek & Joon Ahn, 2021. "Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation," Energies, MDPI, vol. 14(22), pages 1-18, November.
    4. Seung Il Baek & Jaiyoung Ryu & Joon Ahn, 2021. "Large Eddy Simulation of Film Cooling with Forward Expansion Hole: Comparative Study with LES and RANS Simulations," Energies, MDPI, vol. 14(8), pages 1-19, April.
    Full references (including those not matched with items on IDEAS)

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