Improving Film Cooling Efficiency with Lobe-Shaped Cooling Holes: An Investigation with Large-Eddy Simulation

Wang, Kefu; Ao, Yiqun; Zhao, Kai; Zhou, Tao; Li, Feng

doi:10.3390/app13074618

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…Yang et al [15] also studied film cooling patterns with upstream leakage and found that it benefited the film cooling from the film holes. Wang et al [16] numerically studied lobe-shaped holes using a large eddy simulation (LES) to track the flow field of film cooling. Zhao et al [17] used the response surface method to analyze the cooling characteristics of a stream-cooled blade.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Endwall Modification with Micro-Scale Ribs in a Turbine Cascade

Liu,

Song,

et al. 2023

Applied Sciences

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A novel modification method, the ‘micro-scale’ rib, is proposed to expand cooling coverage for turbine endwalls. However, the introduction of the rib will inevitably affect the flow in the near-wall region. Therefore, the variation in the flow pattern for the traditional model of secondary flow needs further exploration. In this paper, to gain a clearer understanding of the micro-scale rib, the original endwall and three types of ribbed endwalls were adopted to numerically present the detailed flow, film cooling, and heat transfer information for the endwall surface and phantom cooling on the suction side (SS) of the blade. The Ansys code CFX was utilized to solve the 3D Reynolds-averaged Navier–Stokes (RANS) equations, and the SST k-ω was selected as the turbulence model after the verification. The results show that the rib-like vortex changed the flow of the coolant and had various impacts on the cooling characteristics. Although the cooling performance of the ribbed endwall improved, it also had a negative impact on heat transfer in most cases. Compared with the original, the vertical rib cases provided optimal film cooling, with increases of 26.9% and 17.4% for rib spacing values of 8 mm and 10 mm, respectively, with little difference in heat transfer (less than 1%). In addition, the horizontal rib cases presented the worse performance for both film cooling and heat transfer, which indicates that the rib layout should consider a mainstream flow direction for future designs.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Endwall Modification with Micro-Scale Ribs in a Turbine Cascade

Liu,

Song,

et al. 2023

Applied Sciences

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Brief Review of Recent Achievements in the Flamelet Manifold Selection and Probability Density Distribution for Flamelet Manifold Variables

Yu,

2024

Journal of Energy Resources Technology

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The flamelet model is a commonly used tool for turbulent combustion simulations in the engineering field due to its computational efficiency and compatibility with complex chemical reaction mechanisms. Despite being widely used for decades, the flamelet model still faces challenges when applied to complex flame configurations, such as partially premixed flames, inhomogeneous inlets, supersonic combustion, or multiphase combustion. The principal challenges are posed by the uncertainty of the presumed shapes for probability density functions of the flamelet tabulation variables and the coupled process of turbulent diffusion and chemical reaction in turbulent combustion. Recent progress is reviewed from the viewpoint of the reaction manifold, with connections made to other combustion models, as well as the determination of joint (or conditional) PDFs for flamelet manifold parameters (e.g., progress variable, scalar dissipation rates, etc.). Promising improvements have been outlined in computational efficiency and the accuracy of predicted variable fields in simulating complex combustion systems (such as turbulent inhomogeneous combustion, combustion with multi-regime modes, and two-phase combustion). Advances in computational resources, DNS data, artificial intelligence, stochastic simulation methods, and other dimension reduction combustion models will contribute to the development of more accurate and efficient flamelet-like models for engineering applications.

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Improving Film Cooling Efficiency with Lobe-Shaped Cooling Holes: An Investigation with Large-Eddy Simulation

Cited by 2 publications

References 32 publications

Numerical Study of Endwall Modification with Micro-Scale Ribs in a Turbine Cascade

Numerical Study of Endwall Modification with Micro-Scale Ribs in a Turbine Cascade

Brief Review of Recent Achievements in the Flamelet Manifold Selection and Probability Density Distribution for Flamelet Manifold Variables

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