Prediction of film cooling effectiveness over a flat plate from film heating studies

Singh, Kuldeep; Premachandran, B.; Ravi, M.R.; Suresh, Batchu; Vasudev, S.

doi:10.1080/10407782.2015.1090232

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…Therefore, for consideration of the operation reliability, film cooling is widely adopted in modern cooling design to lower the surface temperature of the turbine component. There have been many factors validated to affect the film cooling effectiveness [ 1 , 2 ]. They are mainly classified by Bogard and Thole [ 3 ] into three aspects, including the coolant/mainstream conditions [ 4 ], the hole geometry [ 5 , 6 ] and the turbine geometry [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Interaction Mechanism and Loss Analysis of Mixing between Film Cooling Jet and Passage Vortex

Mao

Chen

et al. 2021

Entropy

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The interaction between the film-cooling jet and vortex structures in the turbine passage plays an important role in the endwall cooling design. In this study, a simplified topology of a blunt body with a half-cylinder is introduced to simulate the formation of the leading-edge horseshoe vortex, where similarity compared with that in the turbine cascade is satisfied. The shaped cooling hole is located in the passage. With this specially designed model, the interaction mechanism between the cooling jet and the passage vortex can therefore be separated from the crossflow and the pressure gradient, which also affect the cooling jet. The loss-analysis method based on the entropy generation rate is introduced, which locates where losses of the cooling capacity occur and reveals the underlying mechanism during the mixing process. Results show that the cooling performance is sensitive to the hole location. The injection/passage vortex interaction can help enhance the coolant lateral coverage, thus improving the cooling performance when the hole is located at the downwash region. The coolant is able to conserve its structure in that, during the interaction process, the kidney vortex with the positive rotating direction can survive with the negative-rotating passage vortex, and the mixture is suppressed. However, the larger-scale passage vortex eats the negative leg of the kidney vortices when the cooling hole is at the upwash region. As a result, the coolant is fully entrained into the main flow. Changes in the blowing ratio alter the overall cooling effectiveness but have a negligible effect on the interaction mechanism. The optimum blowing ratio increases when the hole is located at the downwash region.

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Section: Introductionmentioning

confidence: 99%

Interaction Mechanism and Loss Analysis of Mixing between Film Cooling Jet and Passage Vortex

Mao

Chen

et al. 2021

Entropy

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“…Compared with experimental results, they found that the film hole with a compound angle provided better film-cooling performance. Singh et al [2] analyzed the effect of injection angles on film heating and cooling. They indicated that increasing the injection angle enlarged the recirculation zone, which accelerated the mixing of the secondary flow with the mainstream.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of particle deposition in film-cooled blade leading edge

Wang

Tian

Zhu

et al. 2020

Numerical Heat Transfer, Part A: Applications

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This study numerically investigates film-cooling performance and particle trajectories in AGTB (two rows of cylindrical holes equipped on suction side (SS) and pressure side (PS) of the leading edge, respectively) turbine cascade. Particle deposition on a turbine blade is analyzed by calculations of capture efficiency and impact efficiency. The turbulent flow is modeled by the Realizable k-e turbulence model, and the discrete phase model (DPM) with user-defined functions (UDFs) is used to simulate the particle motions. An invasion efficiency is proposed to analyze the possibility of particle invasion into the film hole. Comparisons of various particles with diameters of 1 mm, 5 mm, 10 mm, 20 mm, and 50 mm, respectively, are conducted for four blowing ratios (0.53, 0.93, 1.31, 1.63) and three inlet flow angles (123 , 133 , and 143). It is observed that with a small inlet flow angle and a large blowing ratio, the capture efficiency on the PS decreases. It is found that smaller particle size results in lower invasion efficiency, and larger particles are more likely to invade into the film-cooling hole especially at a low blowing ratio.

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“…Wang et al [9] conducted an investigation of film holes with a compound angle of 45 on film cooling performance, and they found that the compound angle provided a uniform cooling protection downstream the wall. Singh et al [10] performed a numerical study over a flat plate to analyze the effect of the temperature ratio on the film cooling/film heating effectiveness. They pointed out that the film heating cannot be considered analogous to film cooling when high density ratio was used.…”

Section: Introductionmentioning

confidence: 99%

Effect of hole configurations on film cooling performance

Wang

Tian

Luo

et al. 2019

Numerical Heat Transfer, Part A: Applications

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This study aims to investigate the cooling performance of various film cooling holes, including combined hole, cylinder hole, conical hole, and fan-shaped hole. For film cooling technology, a novel combined hole configuration is first proposed to improve the cooling protection for gas turbine engines. This combined hole consists of a central cylinder hole (an inclination angle of 35) and two additional side holes (a lateral diffusion angle of 30). Film holes for four-hole configurations have the same inlet diameter of 8 mm. The adiabatic film cooling effectiveness for each hole configuration is analyzed for varying blowing ratios (M ¼ 0.25, 0.5, 0.75, and 1.0). Results show that the best cooling performance for the conical and fan-shaped holes is obtained at the blowing ratio of 0.75. In addition, the combined hole configuration provides a more uniform cooling protection and a better cooling performance than the other hole configurations.

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Prediction of film cooling effectiveness over a flat plate from film heating studies

Cited by 10 publications

References 20 publications

Interaction Mechanism and Loss Analysis of Mixing between Film Cooling Jet and Passage Vortex

Interaction Mechanism and Loss Analysis of Mixing between Film Cooling Jet and Passage Vortex

Numerical investigation of particle deposition in film-cooled blade leading edge

Effect of hole configurations on film cooling performance

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