Numerical evaluation of film cooling performance of transverse trenched holes with shaped lips

Zhang, Runsheng; Zhou, Leping; Xing, Jiangjiang; Luo, Chenfeng; Du, Xiaoze

doi:10.1016/j.icheatmasstransfer.2021.105326

Cited by 20 publications

(7 citation statements)

References 21 publications

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“…In addition, mass, momentum, and energy are conserved and assumed. The Realizable k-ε model is chosen for the turbulence model with reference to the numerical simulations performed by Zhang et al [42]. The volume of fluid (VOF) model is chosen to simulate two different gas incidences due to the different densities of the mainstream and the coolant.…”

Section: Governing Equation and Turbulence Modelmentioning

confidence: 99%

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Contribution of Different Parameters on Film Cooling Efficiency Based on the Improved Orthogonal Experiment Method

Duan,

Chang,

Chen

et al. 2024

Aerospace

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The use of film cooling technology is one of the most effective ways to minimize the damage to wall materials caused by the high-temperature environment in a ramjet. Optimization of the design to achieve the highest film cooling efficiency on the hot wall is the focus of current research. Due to the large number of parameters affecting the film cooling efficiency and the interactions between them, an improved orthogonal design-of-experiments method is chosen to investigate the contribution of different parameters. Flat plate film cooling and transverse groove film cooling are simulated numerically. The results indicated that the contribution of each parameter is ranked as hole spacing (S/D) > incidence angle > blowing ratio for flat plate film cooling; hole spacing > transverse groove depth > blowing ratio > incidence angle for transverse groove film cooling. The film cooling efficiency is inversely proportional to the size of the flow field area affected by the vortex ring and directly proportional to the size of the vortex intensity. Transverse groove film cooling forms a more complete film in most cases, which is better than flat plate film cooling. Within the scope of this study, a complete film at S/D > 2.0 cannot be generated on the flat plate, which should not be used in ramjet.

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Section: Governing Equation and Turbulence Modelmentioning

confidence: 99%

“…The numerical simulations refer to the study of Zhang et al [42] for the boundary condition settings, as shown in Table 1. The BR is calculated based on the main flow velocity and the average velocity at the hole entrance and is between 0.5 and 2.0.…”

Section: Boundary Conditionmentioning

confidence: 99%

Contribution of Different Parameters on Film Cooling Efficiency Based on the Improved Orthogonal Experiment Method

Duan,

Chang,

Chen

et al. 2024

Aerospace

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“…The FCEs of the hole structures (see also [9]) are calculated in this simulation. First, a cylindrical film hole (Case 1) is used for comparison.…”

Section: Modelingmentioning

confidence: 99%

“…Because of the Coanda effect, the FCE of the fillet trench can be improved to a certain extent compared to the transverse trench [8]. Through numerical simulation, Zhang et al [9] found that the trench lip structure has an important influence on the FCE. It was found that the upper lip structures had a greater effect on FCE than the lower lip structures at the blow ratios (BRs) studied.…”

Section: Introductionmentioning

confidence: 99%

“…However, whether the trenched holes with mist added to the coolant air can further improve the FCE remains unclear, which is worthy of study. Our prior work investigated the influence of trench and lip using air as coolant [9]. It was found that the impact of the upper lip is more apparent than the lower lip structures at different blowing ratios.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of mist/air film cooling performance of trenched holes with shaped lips

et al. 2023

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Mist-assisted film cooling has exhibited great potential for efficient cooling of a turbine blade. Trench structures can significantly affect the film cooling performance of air, while their impact on the adhesion characteristics of the droplets and thus the mist-assisted film cooling performance is unclear. This work highlights the combination of these two aspects by exploring the improvement of the mist-assisted film cooling performance for trenched holes with shaped lips using three-dimensional computations. The results show that the upper lip structure plays a significant role in the adiabatic film cooling effectiveness, whereas the lower lip structure has little effect on it. It is found that the effect of upper lip structure on the adiabatic film cooling effectiveness increases with increasing blowing ratio; the Coanda effect makes the droplets more attached to the wall of the upper fillet lip structure and upper bevel lip structure. Meanwhile, the concentration of mist and the diameter of droplets are crucial for significantly improving the adiabatic film cooling effectiveness. In general, better adiabatic film cooling effectiveness values are observed for both 10 ?m diameter droplets at a specified concentration of mist and larger concentration of mist at a specified droplet size. This work proposes a novel and efficient means of enhancing the cooling performance using mist/air mixture and trenched holes with shaped lips.

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Numerical study of swirl cooling enhancement by adding mist to air: Effects of droplet diameter and mist concentration

Han

Zhang

Song

et al. 2022

Applied Thermal Engineering

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Numerical evaluation of film cooling performance of transverse trenched holes with shaped lips

Cited by 20 publications

References 21 publications

Contribution of Different Parameters on Film Cooling Efficiency Based on the Improved Orthogonal Experiment Method

Contribution of Different Parameters on Film Cooling Efficiency Based on the Improved Orthogonal Experiment Method

Analysis of mist/air film cooling performance of trenched holes with shaped lips

Numerical study of swirl cooling enhancement by adding mist to air: Effects of droplet diameter and mist concentration

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