Comparisons on flow characteristics and film cooling performance of cylindrical and sister holes with/without internal coolant crossflow

Zhu, Huaitao; Xie, Gongnan; Zhu, Rui; Sundén, Bengt

doi:10.1016/j.ijthermalsci.2022.107791

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Figure 15 displays the flow structures visualized through Q-criterion iso-surface contours, which are determined based on the magnitude of x-vorticity for a blowing ratio of 0.7. The Q-criterion identifies vortices as regions where the vorticity's magnitude exceeds that of the strain rate (Haydt and Lynch, 2019;Zhu et al, 2022aZhu et al, , 2022b…”

Section: Effect Of the Mini-channel With Blowing Ratiomentioning

confidence: 99%

“…They also looked into staggered and inline impingement hole arrangements. Zhu et al (2022aZhu et al ( , 2022b Heat transfer analysis and enhancement study computationally investigated a novel film hole design and arrangement known as "sister holes." The findings indicate the sister holes exhibit superior cooling effectiveness across various blowing ratio conditions.…”

Section: Introductionmentioning

confidence: 99%

“…They also looked into staggered and inline impingement hole arrangements. Zhu et al (2022a, 2022b) computationally investigated a novel film hole design and arrangement known as “sister holes.” The findings indicate the sister holes exhibit superior cooling effectiveness across various blowing ratio conditions. Furthermore, as the blowing ratio increases, the benefits of using sister holes become more significant.…”

Section: Introductionmentioning

confidence: 99%

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Mini-channel embedded film cooled flat plate: conjugate heat transfer analysis and enhancement study

Jaiswal,

Sinha Mahapatra

2023

HFF

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Purpose Maintaining the turbine blade’s temperature within the safety limit is challenging in high-pressure turbines. This paper aims to numerically present the conjugate heat transfer analysis of a novel approach to mini-channel embedded film-cooled flat plate. Design/methodology/approach Numerical simulations were performed at a steady state using SST k – ω turbulence model. Impingement and film cooling are classical approaches generally adopted for turbine blade analysis. The existing film cooling techniques were compared with the proposed design, where a mini-channel was constructed inside the solid plate. The impact of the blowing ratio (M), Biot number (Bi) and temperature ratio (TR) on overall cooling performance was also studied. Findings Overall cooling effectiveness was always shown to be higher for mini-channel embedded film-cooled plates. The effectiveness increases with increasing the blowing ratio from M = 0.3 to 0.7, then decreases with increasing blowing ratio (M = 1 and 1.4) due to lift-off conditions. The mini-channel embedded plate resulted in an approximately 21% increase in area-weighted average overall effectiveness at a blowing ratio of 0.7 and Bi = 1.605. The lower uniform temperature was also found for all blowing ratios at a low Biot number, where conduction heat transfer significantly impacts total cooling effectiveness. Originality/value To the best of the authors’ knowledge, this study presents a novel approach to improve the cooling performances of a film-cooled flat plate with better cooling uniformity by using embedded mini-channels. Despite the widespread application of microchannels and mini-channels in thermal and fluid flow analysis, the application of mini-channels for blade cooling is not explored in detail.

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Section: Effect Of the Mini-channel With Blowing Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%